Top 10 Best Good Sound Travel FM Radios You Can’t Miss

Like many travelers, you might find it challenging to enjoy clear, reliable radio signals on the go. Whether on a road trip, camping, or simply commuting, having a good sound quality FM radio can make a big difference. This review focuses on the best good sound travel FM radios designed to offer consistent reception and crisp audio in various environments.

This review focuses on the best good sound travel FM radios designed to offer consistent reception and crisp audio in various environments. These radios are ideal for people who want easy access to music, news, or talk shows without relying on internet connectivity. You can expect durable designs, user-friendly controls, and sound performance tailored for portability.

In the following review, we’ll explore key features, pros, and any drawbacks to help you choose the right travel FM radio to suit your specific needs.

Discover Top Picks for Clear and Reliable Audio on the Go

Image	Product	Price
Pick 1	Panasonic RF-2400-K Portable AM/FM Radio	Check Price
Pick 2	Sony ICF-506 Analog Portable FM/AM Radio	Check Price
Pick 3	Sangean PR-D18BK Portable AM/FM Digital Radio Black/Grey	Check Price

1. Panasonic RF-2400-K Portable AM/FM Radio

Experience reliable and clear AM/FM radio reception wherever you go with the Panasonic RF-2400-K. This portable radio delivers impressive sound quality while remaining compact and easy to operate. Its straightforward design suits users valuing simplicity without sacrificing performance.

Built to meet everyday listening needs, the RF-2400-K excels in versatility. Whether you’re at home, outdoors, or facing power outages, enjoy uninterrupted radio access through batteries or AC power. Its lightweight frame and responsive tuning make it a convenient companion for daily use.

The Panasonic RF-2400-K offers a user-friendly experience with its large, fluorescent dial pointer. This feature allows for clear visibility in low-light conditions. Tuning stations is smooth and stable thanks to the digital tuner with Auto Frequency Control (AFC), which minimizes signal drift.

Tuning stations is smooth and stable thanks to the digital tuner with Auto Frequency Control (AFC), which minimizes signal drift.

Designed to pick up both AM and FM bands effectively, the built-in telescopic antenna enhances signal reception. Portability is a key advantage, as the radio runs on either four AA batteries or an included AC adapter.

Audio quality is clear and crisp, supporting headphone connectivity through a standard 5mm jack for private listening. The radio’s sturdy plastic casing and simple controls contribute to a durable, easy-to-use device. Overall, it serves well for users who want straightforward, dependable radio performance.

Pros

• Easy-to-see dial with fluorescent pointer for nighttime use
• Dual power options: AC adapter and 4 AA batteries for flexibility
• Stable tuning via digital tuner with Auto Frequency Control

Cons

• Not water-resistant, limiting outdoor exposure in wet conditions

The Panasonic RF-2400-K stands out as a simple and effective portable radio. Its clear sound, reliable tuning, and versatile power options make it a solid choice for those needing good sound quality on the go. Compared to other portable radios, it balances functionality and ease of use well.

Compared to other portable radios, it balances functionality and ease of use well.

2. Sony ICF-506 Analog Portable FM/AM Radio

Experience clear and reliable radio listening on the go with the Sony ICF-506 Analog Portable FM/AM Radio. Combining classic analog tuning with everyday portability, this radio suits various environments and lifestyles effortlessly. Its compact build and simple controls ensure it’s ready wherever your day takes you.

Its compact build and simple controls ensure it’s ready wherever your day takes you.

Designed to deliver rich sound, the powerful mono speaker produces excellent audio quality for both FM and AM stations. A built-in carry handle adds convenience for easy transport, making it a dependable companion during travel or outdoor activities.

The Sony ICF-506 offers dependable analog tuning that’s straightforward and responsive. Swapping stations is smooth, allowing you to quickly find your favorite broadcasts.

The radio’s analog display shows clear frequency markings, benefiting those who appreciate a traditional interface.

Made with a sturdy build, it withstands frequent handling, which is ideal when moving between locations. The mono audio output delivers crisp sound, providing ample volume for personal enjoyment or small gatherings. This portable device suits people who want a no-fuss radio with classic style, whether at home, on a trip, or anywhere else.

Compared to digital-only radios, this model offers simplicity in design and functionality without relying on complex menus or touchscreen controls. Its battery-powered operation enhances flexibility as you’re not tied to outlets. Overall, the Sony ICF-506 balances sound quality, ease of use, and portability, making it a reliable choice for daily radio listening.

Pros

• Easy-to-use analog tuner with smooth frequency adjustment
• Strong mono speaker delivers clear and loud sound
• Portable design with built-in carry handle for convenience

Cons

• Mono audio output lacks stereo sound experience

Offering reliable performance and classic appeal, the Sony ICF-506 is a practical option for those who value straightforward radio listening. Its portability and robust sound capabilities make it a standout among analog radios designed for everyday use and travel.

3. Sangean PR-D18BK Portable AM/FM Digital Radio Black/Grey

Experience clear and reliable radio entertainment wherever you go with the Sangean PR-D18BK Portable AM/FM Digital Radio. Designed for convenience and excellent sound quality, it keeps your favorite stations within reach. Perfect for travel, home, or outdoor use, this compact radio offers versatility and sharp reception in a stylish black and grey finish.

Enjoy effortless tuning and volume control on a user-friendly digital interface. The adjustable sleep timer and easy-to-read LCD display with backlight enhance usability during day or night. Powered by AA batteries or AC (adapter sold separately), it ensures hours of uninterrupted listening, matching your lifestyle and on-the-move needs.

The Sangean PR-D18BK presents a robust build with a portable design that fits comfortably in hand or bag. AM and FM bands provide a variety of tuning options, while the digital tuner delivers precise frequency selection up to 108 MHz. Its 1-watt speaker outputs good sound clarity for personal listening, making it a reliable companion for casual radio fans.

Settings are straightforward, supported by an LCD display backlit for easy nighttime use without straining the eyes. A sleep timer feature helps conserve battery life by turning off the radio automatically at your chosen interval.

Its battery operation (requires 4 AA batteries) allows for flexibility without needing constant access to a power outlet.

Ideal for daily commutes, outdoor relaxation, or kitchen listening sessions, the portable radio suits users who want a simple yet effective AM/FM device. The combination of portability, usability, and digital accuracy offers great value while standing out among similarly priced radios due to its trusted brand reputation and practical features.

Pros

• Clear digital tuning with a bright, easy-to-read LCD display
• Dual power options: battery-operated or AC powered (adapter sold separately)
• Adjustable sleep timer for energy-saving convenience

Cons

• Speaker sound output is modest and may not suit large spaces

The Sangean PR-D18BK offers a balanced mix of portability, user-friendly functions, and dependable radio performance. Its simplicity makes it a strong choice for anyone seeking a solid travel or everyday radio without unnecessary complexity. Compared to other portable radios, it excels in display clarity and power options, ensuring continuous enjoyment wherever life takes you.

Compared to other portable radios, it excels in display clarity and power options, ensuring continuous enjoyment wherever life takes you.

4. Sangean HDR-16 HD AM/FM Portable Radio Black

Experience exceptional audio quality wherever you go with the Sangean HDR-16 HD AM/FM Portable Radio. This compact device delivers crystal-clear high-definition sound on local HD Radio stations, making your listening moments vivid and enjoyable.

Ideal for travel or home use, the HDR-16 offers versatile access to FM stereo, AM, and HD Radio bands. It ensures you stay tuned to a broad range of stations with improved audio performance, all without any subscription fees.

The Sangean HDR-16 features an intuitive design that supports 10 programmable memory presets, allowing fast access to your favorite stations. Its backlit LED display presents essential information such as station details, time, and date clearly.

Two alarm functions help you maintain your schedule easily.

Power options include battery and AC operation, enhancing adaptability for different environments. An auxiliary input and record output enable connection to other audio devices and home stereo systems, expanding usability.

With a solid build and straightforward controls, this portable radio delivers high-definition digital audio on the go. It suits travelers, commuters, and anyone who values quality sound in a compact form.

Pros

• High-definition digital audio for crisp sound quality
• Multiple radio bands: HD Radio, FM stereo, and AM reception
• 10 programmable presets for quick access to favorite stations

Cons

• Not water resistant, limiting outdoor use in wet conditions

The Sangean HDR-16 HD Portable Radio delivers clear sound and versatile tuning options in a compact design. Its balance of performance and portability makes it an excellent audio companion for daily use and travel.

5. DreamSky AM FM Portable Radio

The DreamSky AM FM Portable Radio delivers clear and crisp sound with reliable reception, designed for both indoor and outdoor use. Its compact size combined with user-friendly features makes it a strong choice for anyone seeking a dependable radio for everyday entertainment or emergency situations.

Equipped with a large analog dial and a powerful speaker, the radio effortlessly tunes into AM and FM stations, providing consistent audio quality. Its versatility in power sources enhances convenience, allowing seamless use at home or on the go.

This portable radio catches AM and FM signals effectively, even in remote areas. The robust speaker ensures loud, clear sound without static or cross-talk, delivering enjoyable listening experiences.

Operating the device is straightforward, thanks to the smooth and large analog dial. Tuning to favorite stations such as music channels, news, and sports broadcasts takes just seconds. This simplicity makes it especially suitable for seniors or users who prefer uncomplicated electronics.

This simplicity makes it especially suitable for seniors or users who prefer uncomplicated electronics.

Power options include an AC adapter for home use or four AA batteries for outdoor activities, increasing its range of usability. The compact design also makes it a handy companion during power outages, camping, or yard work. Additionally, its modest size and ease of operation make it an excellent gift option for family members of all ages.

Additionally, its modest size and ease of operation make it an excellent gift option for family members of all ages.

Pros

• Strong AM/FM reception with clear, loud audio quality
• Simple tuning using a large, smooth analog dial
• Dual power options: AC adapter or battery operated

Cons

• Not water-resistant, limiting outdoor exposure in wet conditions

The DreamSky AM FM Portable Radio combines reliability and simplicity, making it a valuable tool for listening enjoyment and emergency preparedness. Its clear sound, ease of use, and flexible power sources set it apart among similar compact radios available on the market.

6. DreamSky Portable AM FM Shortwave Radio

Discover the DreamSky Portable AM FM Shortwave Radio, designed to deliver exceptional sound quality and versatile listening options. Perfect for staying connected to news, music, and talk shows, this radio combines nostalgic charm with modern functionality.

Its compact design and powerful speaker ensure clear audio that fills any room, making it a reliable companion both indoors and outdoors. Enjoy the simplicity of analog controls paired with a bright digital display for easy tuning.

The DreamSky radio features a large high-performance speaker that delivers impressive volume and clarity. Whether tuning into AM, FM, or shortwave stations, its long-range antenna ensures strong reception even in remote areas.

Operating the radio is straightforward with big analog knobs for volume and tuning. The radio includes an earphone jack for private listening without disturbing others.

Power options include plugging into an AC adapter for home use or inserting 4 AA batteries for portable convenience. This flexibility makes it an excellent choice for camping, yard work, or emergencies.

Durable construction and simple controls cater well to seniors, kids, and anyone seeking reliable portable radio entertainment.

Pros

• Large speaker provides loud and clear sound quality
• Strong reception with a long range transistor antenna
• Dual power options: AC adapter or battery-powered for portability

Cons

• Not water resistant, requiring care during outdoor use

Offering a perfect blend of classic design and practical features, the DreamSky Portable Radio stands out in both performance and ease of use. Its reliable reception and flexible power choices make it a valuable addition for home or outdoor use, providing consistent enjoyment for listeners of all ages.

7. PRUNUS J03 AM FM Portable Radio

Experience the blend of portability and clear reception with the PRUNUS J03 AM FM Portable Radio. Designed for users who appreciate convenient access to AM and FM stations, this radio adapts effortlessly from indoor use to outdoor escapades.

Its compact size and lightweight build make it easy to bring along wherever you go.

Whether you prefer plugging it in or using battery power, this radio offers flexible operation to suit various situations. Enjoy straightforward controls, vivid sound quality, and reliable station reception packed into a small, manageable device.

Operating on either AC power or with four AA batteries, the PRUNUS J03 suits both home and outdoor environments without hassle. It features a foldable handle and weighs just over 20 ounces, ensuring transport is comfortable during travel or leisure.

The large frequency scale and simple tuning knobs allow users of all ages to switch between AM and FM effortlessly. Thanks to an advanced DSP chip and a sizable

A speaker occupying most of the radio’s body delivers full-bodied audio that easily fills a room. For personal listening, a 5mm headphone jack invites quiet enjoyment without disturbing others.

This radio appeals to a broad audience — from seniors to younger listeners — making it a versatile choice for many households.

Pros

• Dual power options: AC plug or 4 AA batteries offer versatile usage.
• Robust reception through a 19.5-inch telescopic antenna and DSP chip.
• Compact, lightweight design with a foldable handle for easy portability.

Cons

• Batteries are not included, requiring separate purchase for battery use.

Combining portability, ease, and sound clarity, the PRUNUS J03 is a dependable radio for everyday use and travel. Compared with similar radios, its blend of power options and clear audio placement makes it an excellent companion for diverse listening needs.

8. Portable AM/FM Transistor Radio

Experience reliable radio listening wherever you go with the Portable AM/FM Transistor Radio. Designed for easy use and clear sound, it captures AM, FM, and shortwave frequencies effortlessly.

Featuring a built-in DSP anti-jamming chip, it enhances radio sensitivity to deliver uninterrupted broadcasts. The telescopic antenna adjusts for optimal reception, ensuring access to various programs like music, news, and traffic updates. Its bright 5W speaker provides crisp audio, making every station come alive.

The Portable AM/FM Transistor Radio operates across multiple bands: FM (88-108 MHz), AM (530-1710 kHz), and SW (8-22 MHz) for diverse listening options. Switching among these modes is simple thanks to dedicated function buttons and a large channel tuner. Volume controls are conveniently accessible, making the device suitable for users of all ages, especially seniors.

Built with both portability and convenience in mind, it runs on a rechargeable lithium-ion battery while also supporting USB DC 5V charging. This dual charging option ensures the radio is ready for emergencies or travel without power concerns.

Compact yet durable, the radio balances ease of use with advanced features at a compelling value. Whether for everyday listening or as part of an emergency kit, this radio brings classic simplicity combined with modern technology to your hands.

Pros

• Wide frequency coverage including AM, FM, and shortwave bands
• DSP anti-jamming chip for enhanced signal clarity
• Dual charging options with rechargeable battery and USB power

Cons

• No water resistance, limiting use in wet environments

This portable transmitter radio stands out with reliable reception and user-friendly controls. Its versatile charging methods and strong speaker make it an excellent choice for everyday listening and travel preparedness.

9. PRUNUS J-166 Portable AM FM Radio

Experience clear and reliable radio listening with the PRUNUS J-166 Portable AM FM Radio. Compact and lightweight, it fits comfortably in your hand and is easy to carry anywhere. Whether you enjoy music, talk shows, or news, this radio offers excellent reception and sound quality for your everyday entertainment needs.

Whether you enjoy music, talk shows, or news, this radio offers excellent reception and sound quality for your everyday entertainment needs.

Designed with convenience in mind, it’s ideal for outdoor activities, commuting, or emergency preparedness. Its classic design combines user-friendly controls and durable construction, making it a practical choice for all ages. Stay connected to your favorite stations with this dependable and versatile portable radio.

Stay connected to your favorite stations with this dependable and versatile portable radio.

The PRUNUS J-166 radio impresses with its compact size, measuring just 7 by 5 by 1 inches and weighing only 2 ounces without batteries. It easily fits in your pocket or emergency kit thanks to the built-in back clip and included lanyard for hands-free carrying.

Operating the device is straightforward with three control knobs that handle tuning, volume, and power/band switching.

Reception is outstanding using its adjustable 5-inch antenna combined with an advanced DSP chip, allowing clear access to AM and FM stations even in remote locations.

For private listening, the 5mm headphone jack supports earphones or headphones.

Additional features include a red battery indicator that alerts you when power is low and a green signal indicator that assists in finding stations easily. This radio runs on two AA batteries (not included) and is designed to be dust resistant, shockproof, and lightweight. It suits parents, elders, and music lovers looking for a straightforward, quality AM/FM radio with great sound and portability.

It suits parents, elders, and music lovers looking for a straightforward, quality AM/FM radio with great sound and portability.

Pros

• Compact, lightweight design with back clip and lanyard for easy carrying
• Superior reception via adjustable antenna and DSP chip in AM/FM bands
• Clear sound quality from built-in magnetic speaker with headphone support

Cons

• Requires AA batteries, which are not included with the radio

The PRUNUS J-166 Portable AM FM Radio offers reliable performance and ease of use in a small package. Its excellent signal reception and clear audio make it a practical choice for everyday listening and outdoor use. A well-built radio suited for anyone who values simplicity and quality sound on the go.

A well-built radio suited for anyone who values simplicity and quality sound on the go.

10. PRUNUS J-150 Portable AM FM SW Bluetooth Radio Speaker

Experience the blend of vintage charm and modern convenience with the PRUNUS J-150 Portable AM FM SW Bluetooth Radio Speaker. Designed for versatile use, it brings together multiple power options and robust reception in a compact package.

Whether you are outdoors or relaxing at home, this radio keeps entertainment and essential broadcasts within easy reach.

Compact and lightweight, the radio is crafted to accompany you effortlessly on trips, camping, or outdoor gatherings. Its retro design combined with modern Bluetooth and USB playback functions makes it both a stylish and practical companion.

The PRUNUS J-150 offers a comprehensive audio experience with AM, FM, and Short Wave bands supported by a 7-inch telescopic antenna and a DSP chip. This combination ensures clear reception across diverse locations, from urban centers to remote areas.

Tuning is straightforward, thanks to intuitive knobs inspired by classic radios, making it user-friendly for all ages.

Its tri-power supply system is a standout feature. Users can charge it via USB, use two D batteries during outages, or rely on its efficient solar panel for sustainable energy.

This flexibility ensures continuous use without concern over power sources. The built-in 1200mAh rechargeable battery offers reliable performance for extended listening sessions.

Beyond radio broadcasting, the device doubles as a Bluetooth speaker compatible with modern smartphones, laptops, and tablets. It also supports USB drive and TF card playback, ideal for offline music enjoyment. When paired with a second unit, the true wireless stereo function enhances sound quality with immersive 0 stereo output, elevating your listening experience.

Its faux wood grain finish adds a nostalgic aesthetic that complements home decor, while the handle makes it extremely portable at just 2 pounds. This radio is perfect for seniors, outdoor lovers, and anyone valuing a blend of retro design with functional technology.

Pros

• Three versatile power sources: USB, batteries, and solar charging.
• Clear and wide radio band reception with DSP chip and telescopic antenna.
• Supports Bluetooth, USB, and TF card audio playback with TWS stereo option.

Cons

• Not water resistant, limiting outdoor use during wet conditions.

The PRUNUS J-150 stands out as a multi-functional portable radio speaker that merges classic style with modern versatility. Its extensive feature set and ease of use make it a valuable companion for outdoor activities and everyday listening alike.

Things to Consider Before Buying the Best Sound Travel FM Radios

Sound quality features

Sound quality features play a major role in the enjoyment and performance of travel FM radios. Speaker performance and clarity are often what users notice first, as clear audio without distortion allows for effortless listening to music, news, or talk shows even in busy environments. A well-balanced bass and treble provide richness and depth to the sound, making voices sound natural and music more vibrant rather than tinny or overly bass-heavy.

A well-balanced bass and treble provide richness and depth to the sound, making voices sound natural and music more vibrant rather than tinny or overly bass-heavy. Effective noise reduction and interference handling help maintain a steady signal, preventing static and disruptions caused by nearby electronic devices or atmospheric conditions. These aspects combined create a satisfying listening experience whether used indoors or outdoors, making it easier to stay tuned in during travels or commutes.

Portability and design

Compact size and lightweight construction play a major role in making good sound travel FM radios easy to carry along during trips, fitting comfortably in bags or pockets without adding bulk. Devices crafted from sturdy materials manage to withstand the knocks and bumps that often happen on the move, contributing to their overall durability and longevity. Simple control layouts with well-spaced buttons and clear labeling help users adjust settings quickly, avoiding any frustration and allowing for smooth operation even while on the go.

Simple control layouts with well-spaced buttons and clear labeling help users adjust settings quickly, avoiding any frustration and allowing for smooth operation even while on the go. These elements together create a user-friendly experience that suits the dynamic nature of travel, ensuring the radios remain both practical and reliable wherever the journey leads.

Tuning and reception

The frequency range and band options available in good sound travel FM radios often include the standard FM band and sometimes additional AM bands, allowing for a wider selection of stations depending on location. Radios equipped with automatic tuning can simplify the process by scanning for available channels, making it easy to find clear stations quickly, while manual tuning offers more control for precise adjustments and can be useful in areas with fluctuating signals.

The antenna type plays a significant role in reception quality; telescoping antennas are common and generally effective for capturing FM signals during travel, although some models may include built-in antennas that provide convenience but could be less powerful in remote areas. Considering these factors helps to match the radio’s capabilities to different environments and listening preferences, ensuring an enjoyable and reliable listening experience wherever the journey takes you.

Power options and battery life

Power options greatly influence the convenience and reliability of best good sound travel fm radios. Many models come with rechargeable batteries, offering the advantage of multiple uses without frequent replacements, and their battery life on a full charge typically ranges from several hours up to a full day depending on usage and model efficiency.

Alternative power sources such as USB charging have become increasingly popular, allowing radios to be powered via portable power banks or laptop connections, adding to their versatility. Additionally, radios equipped with solar panels harness sunlight for energy, making them useful in outdoor settings or situations without electrical access.

Hand crank mechanisms offer a manual option to generate power, which can be especially valuable during extended outdoor adventures or power outages, ensuring the radio remains functional when other sources are unavailable. The variety of these power options provides travelers with dependable choices to match different needs and environments.

Additional features

Good sound travel FM radios often come equipped with extra functions that enhance their convenience and usability. Having an alarm and clock integrated into the radio can make it a practical companion for daily routines, especially when used in hotel rooms or during trips.

Connectivity options such as a headphone jack or AUX input provide flexibility for private listening or connecting to other audio devices. Many models also offer memory presets and station storage, which make switching between favorite radio stations quick and effortless, saving time during travel.

These features combined create a well-rounded experience suited to various use cases, whether enjoying news, music, or podcasts on the go.

Price and warranty

Good sound travel FM radios come in a variety of price ranges that cater to different budgets, making it possible to find options that balance cost and features effectively. Many models offer excellent value for money by combining clear audio quality with portability and user-friendly controls. Customer support and warranty coverage often accompany these radios, providing peace of mind in case of technical issues or defects.

Reliable brands typically include warranty periods that protect against malfunctions, along with accessible service channels. Return policies and satisfaction guarantees further add to buyer confidence, allowing for exchanges or refunds if the product does not meet expectations.

Taking note of these aspects helps in appreciating the overall worth and reliability of good sound travel FM radios beyond just their price tags.

FAQ’s

What Are The Best Travel Fm Radios Known For Their Sound Quality?

The best travel FM radios known for their sound quality typically come from brands like Sony, Sangean, and C.Crane, which offer clear audio and strong signal reception. Models such as the Sony ICF-P26 and Sangean PR-D18 provide excellent sound clarity in a compact, portable design.

Which Travel Fm Radios Offer The Clearest And Richest Audio Performance?

Travel FM radios from brands like Sony and Sangean are known for offering the clearest and richest audio performance, thanks to their advanced tuner technology and high-quality speakers. Models such as the Sony ICFP26 and Sangean DT-400 provide excellent sound clarity and strong signal reception ideal for travel.

How Do The Top Travel Fm Radios Compare In Terms Of Sound Clarity And Reception?

Top travel FM radios generally offer excellent sound clarity with minimal distortion, ensuring a clear listening experience. In terms of reception, premium models typically provide stronger, more stable signals even in remote or challenging locations, outperform basic versions.

What Features Should I Look For In A Travel Fm Radio To Ensure Good Sound Quality?

To ensure good sound quality in a travel FM radio, look for features like a high-quality speaker, clear audio output, and noise reduction capabilities. Additionally, a strong tuner with good reception and adjustable bass and treble settings can enhance listening experience.

Are There Any Budget-Friendly Travel Fm Radios With Excellent Sound Quality?

Yes, there are budget-friendly travel FM radios like the Sony ICFP26 and the Sangean PR-D18 that offer excellent sound quality. These models are compact, affordable, and provide clear reception, making them great choices for travelers.

Conclusion

Choosing the best good sound travel FM radios involves balancing portability, sound clarity, and battery life. These radios offer clear reception and compact design, making them ideal for travelers who want easy access to their favorite stations on the go.

Suitable for casual listeners and frequent travelers alike, these radios provide a dependable way to stay connected to radio broadcasts without relying on smartphones or internet access. For those seeking a reliable companion to accompany their journeys, investing in one of the best good sound travel FM radios can enhance the overall travel experience without unnecessary complexity or bulk.