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[Carefully Selected by Type] 9 Recommended Attenuators! Explained from Basic Knowledge to Important Points [Reviews]
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The true value of a vacuum tube amplifier lies in the "saturation" and "rich harmonics" that are produced when the power tubes are fully operational. However, achieving this in a home or small live music venue is nearly impossible in today's living environment.
This is where an attenuator becomes necessary.
This article covers everything from basic knowledge about attenuators to how to choose one and important usage tips, and introduces eight carefully selected recommended models for different purposes. Find the one that's best suited to your setup and unlock the full potential of your amplifier.
\ Going to meet Sound House's sister /
An older sister I often seePlease use Sound House again next time.
Why is an attenuator necessary? (Difference from a master volume)
Many guitarists think that "since my amp has a master volume, I don't need an attenuator." However, the two have completely different roles.
The master volume is a function that reduces the volume of the distortion created by the preamp (front stage) before it is sent to the power amp (back stage). In other words, the power tubes themselves are not driven to their limits at all, and you will not get the "compression" or "powerful thrust" that is unique to vacuum tubes.
On the other hand, an attenuator is a device that attenuates the final output of an amplifier (the strong signal going to the speaker) by converting it into heat energy just before the speaker.Keep the knobs on the amplifier itself at full volume (the power tubes are severely distorted), and reduce the volume that actually reaches your ears.To get that "real tube tone" you hear on those records, an attenuator is essential.
Four checkpoints to avoid mistakes when selecting an attenuator
① Match the "impedance (Ω)" of the amplifier and cabinet
The most important thing to consider when choosing an attenuator, and one that you must never get wrong, is "impedance (resistance value)."
・What is impedance?
It is a numerical value that indicates electrical resistance and is expressed in units of "Ω (ohms)." If you look at the back of a guitar amp or cabinet, you should see something like "4Ω," "8Ω," or "16Ω."
・Points to consider when choosing
As a general rule, the amplifier's output Ω, attenuator's response Ω, and cabinet's input Ω must all be the same. If these do not match, it will put a strain on the transformer, the heart of the amplifier, and may cause it to malfunction.
・Recommended specifications
When purchasing, it is very convenient to choose a model that allows you to switch between 4Ω/8Ω/16Ω using a switch on the back, as this will allow you to reuse the same model even if you change your amplifier in the future.
② Select a "power rating (W)" that is sufficient for the amplifier's output.
The next thing to check is the allowable input (wattage) of the attenuator, which is "how much power it can handle."
・The trap of vacuum tube amplifier wattage
Even if a vacuum tube amplifier is labeled "50W," if you turn the volume up to nearly full, the peak energy generated will far exceed the rated output (50W).
・Points to consider when choosing
A key rule of thumb for safe use is to choose an attenuator with an input capacity that is roughly twice the wattage of the amplifier. For example, if you have a 50W amplifier, it is safe to choose an attenuator that is rated for 100W. If you choose an attenuator that is too close to the limit of its capabilities, there is a risk that it will overheat or burn out internally.
3) Volume adjustment method (step or continuous)
The knob specifications for actually lowering the volume also have a major impact on usability. There are mainly two types.
・Step-type
This type of speaker has a clickable switch that adjusts the volume attenuation to -8dB, -16dB, or -20dB. The advantage is that the internal circuit design is simple, making it easier to minimize degradation in sound quality, but it can be frustrating not being able to make fine adjustments, such as "-8dB is still too loud, but -16dB is too quiet."
・Stepless (volume knob type)
This type allows you to seamlessly adjust the volume by turning a knob, just like the volume on a TV. This allows you to precisely adjust the volume to suit your home environment, such as "I want to turn the volume down just a few millimeters because my family is sleeping," so it's highly recommended for those who mainly practice at home.
Presence or absence of "dummy load function" (can it be used without a cabinet)
If you are considering silent recording or practicing with headphones, be sure to check whether your device has this "dummy load (Load Box) function."
-What is the dummy load function?
This function allows the attenuator to safely consume power internally even when no speaker cabinet is connected.
・Points to consider when choosing
Normally, a vacuum tube amplifier will instantly break if you turn it on without connecting speakers. However, if you connect an attenuator with a dummy load function, you can record the amplifier's sound using only the line output (connected to an audio interface) without outputting sound from the speakers. This is an essential feature if you want to record at home late at night.
[Comparison Table] 8 Recommended Attenuators
| Item | Bugera PS1 | Crews GB-VI | Rivera RockCrusher | Tone King Ironman II Mini | SPL Reducer | Torpedo Captor X | Universal Audio OX | Fryette PS-2A | Boss Waza TAE |
| Circuit Type | Resistance type | Resistance type | Reaction equation | Reaction equation (trans) | Resistive type (professional quality) | Reaction equation | Reaction equation | Reaction formula + tube | Reaction formula + digital |
| Volume adjustment | Stepless | Stepless 50% to 0% | 5-stage (fixed) + stepless 5 fixed attenuation levels + infinitely adjustable in "Studio" mode | Total of 18 levels (6 levels x 3 settings) A total of 18 fixed values can be set by combining the 6-stage rotary switch, HI/LO switch, and Solo function. | 2-stage (fixed) + stepless | 3 levels (fixed) 0dB / -20dB / -38dB 3-position switch | 6 levels (fixed) Fixed to 0 / -6 / -12 / -24 / -36 / Silent. | Stepless Re-amping allows for over 100% | Stepless Re-amping allows for over 100% |
| Compatible resistance value (Ω) | 4 / 8 / 16 | 4 / 8 / 16 | 8 / 16 | 8 fixed | 4 / 8 / 16 | 8 or 16 | 4 / 8 / 16 | 2/4 / 8 / 16 | 4 / 8 / 16 |
| Maximum Allowable Input | 100W | 150W | 120W | 30W | 200W | 100W | 150W | 200W | 150W |
| ダミーロード | No | will get | will get | will get | None (mute setting possible) | will get | will get | will get | will get |
| IR/Cavity Simulator | No | No | No | No | No | will get | will get | No | will get |
| Reamp function | No | No | No | No | No | No | No | Yes (vacuum tube) | Yes (analog) |
[Cost-effective] Entry-level passive model
Bugera / PS1
| Circuit method | Resistive (passive) |
| Maximum Allowable Input | 100W |
| Impedance | 4Ω, 8Ω, 16Ω (individual input terminals) |
| Dummy load function | None (speaker connection required) |
| Drive power supply | Must not |
- Overwhelming cost performance
It is by far the most affordable of the many attenuators available, making it the perfect price for first-time users or those who just want to increase the volume a little at home. - Supports 100W high-output amplifiers
Although it is an inexpensive passive amplifier, it is tough enough to withstand the power of a large 100W tube amplifier. - Mic-emulated line output
It is equipped with an XLR terminal that allows you to output sound from the cabinet while sending the signal directly to a mixer or audio interface. - Simple design that does not require a power supply
It can be powered simply by connecting the amplifier and cabinet with a speaker cable, so there is no need for additional adapters or power supplies.
This model boasts an overwhelming share of the market as a 100W compatible passive attenuator. Although it is physically unavoidable to lower the volume too much, which is typical of resistor-type attenuators, it performs well enough for applications where you just want to open up the volume a little at home.
Positive reviews
- "It won't go full 10, but it's perfect for driving a little power tube at home."
- "It's so cheap. I'm happy that even if it breaks, I can still buy a new one."
Negative reviews
- "When you turn the volume down below half, the highs drop off suddenly and the sound becomes muffled."
- "The unit gets very hot, so you can't put anything on top of it."
Crews Maniac Sound / GB-VI
| Circuit method | Resistive (passive) |
| Maximum Allowable Input | 150W |
| Impedance | 8 ohms or 16 ohms (Select at time of purchase) |
| Dummy load function | Yes |
| Drive power supply | Must not |
- Reliable Made in Japan quality
- Assembled by hand by a high-end domestic brand, it boasts overwhelming durability that will not break even in the harsh conditions of professional environments.
- Supports 150W high-output amplifier
It is designed with an extremely high input capacity, and can safely handle even monster amplifiers over 100W at full power. - Headphone output for late-night practice
The attenuator itself is equipped with a headphone jack and level control, allowing you to directly monitor the amplifier's drive sensitivity. - Completely silent dummy load
Since it can convert 100% of the amplifier's output into heat without connecting a cabinet, it is ideal for creating a silent home recording environment.
This is a classic passive attenuator from the high-end Japanese brand Crews Maniac Sound. It supports a high-output 150W amplifier and features a dummy load function and headphone output, making it ideal for a wide range of applications, from practicing at home to late-night home recording. While the high-frequency drop-off inherent to resistor-type amplifiers is physically unavoidable, this classic attenuator has been loved for many years for its rugged construction and reliable Japanese-made quality.
Positive reviews
- "It's very useful for driving a 100W amplifier at home. It's well-made and gives me a sense of security."
- "It's great when you connect the line out to an audio interface and use a cabinet simulator."
- "The reliability you can only get from a Japanese-made product. I've been using it hard for many years and it shows no signs of breaking down."
Negative reviews
- "When you turn the volume down significantly, the high frequencies are cut off a little and the sound becomes muffled."
- "The impedance is fixed (8Ω or 16Ω models only), so you may not be able to use it with another amplifier if you buy one."
Pochip
[Emphasis on quality and sound quality] High-end reactive model
Tone King / Ironman II Mini
| Circuit method | Reaction formula (transformer coupling) |
| Maximum Allowable Input | 30W |
| Impedance | 8Ω |
| Dummy load function | Yes |
| Drive power supply | 9V DC or 2 AA batteries (for driving relay) *Power supply required when using SOLO mode |
- Transformer coupling method
- By using a unique transformer circuit instead of resistors, the amplifier's original harmonics and sustain are perfectly maintained even at extremely low volume levels.
- Compact size that fits on a pedal board
It is unusually compact for a high-end attenuator, and can be easily incorporated into an effects board for easy portability. - Solo switch is useful for live performances
- The foot switch allows you to instantly switch between two pre-set volume levels (attenuation levels), and functions as a boost during guitar solos.
- Presence switch for high-frequency compensation
When the volume is turned down to the lowest setting, the high-frequency cut can be fine-tuned in three stages to match the character of the amplifier. - Dummy Load & Lineout
If you have a small amplifier of 30W or less, you can use it as a dummy load without connecting a cabinet and perform line recording.
This is a top-quality reactive attenuator designed to deliver the ultimate tone from small vacuum tube amplifiers under 30W. Its unique transformer circuitry ensures that the amplifier's original overtones and picking nuances are not lost, even when the volume is turned down to the lowest possible level. Furthermore, the footswitchable "solo" function quickly restores the volume for solos, making it incredibly practical.
Positive reviews
- "The sound is surprisingly not thin. The tone is lively even when the volume is turned down to its lowest point."
- "The solo footswitch is incredibly useful for live performances. It's worth buying just for that."
- "The presence switch allows for high-frequency correction, making it easy to match with any amplifier."
Negative reviews
- "The maximum allowable input is 30W, so it cannot be used with large 50W or 100W amplifiers."
- "The price is quite high for its size, about the same as a small amplifier itself."
Pochip
Rivera / RockCrusher
| Circuit method | Reactive Load |
| Maximum Allowable Input | 120W |
| Impedance | 8Ω, 16Ω (switchable) |
| Dummy load function | Yes |
| Drive power supply | Must not |
- Fully reactive loading
It precisely reproduces the impedance curve of a real speaker, so picking elasticity and response are not compromised even when the volume is turned down. - Studio-grade EQ switch
It is equipped with Edge and Warm switches that compensate for the high and low frequencies that tend to be lost due to an illusion of the human ear when attenuating. - Fine-tuned Studio mode
In addition to step-wise attenuation, the Studio knob allows for fine-tuning of the volume in the extremely low volume range, making it ideal for practicing at home. - Robust design for professional use
It has a reliable design, featuring a thick steel chassis that can withstand the rigors of touring and a large heat sink for heat dissipation.
This high-end model was developed to maximize the potential of tube amplifiers. The reactive load tricks the amplifier into thinking it's connected to a real cabinet, ensuring that the springiness and response to your picking are not lost.
Positive reviews
- "I was impressed that even when I turned up the volume on the amp, the nuances of my touch remained intact."
- "The Edge switch allows the highs to come through even at the lowest volume."
- "It's so sturdy it feels as safe as a tank."
Negative reviews
- "The device is very large and heavy, so it's not very portable."
- "They are expensive, so the equipment cost can sometimes be more than the amplifier itself."
SPL / Reducer
| Circuit method | Resistive (high quality passive) |
| Maximum Allowable Input | 200W |
| Impedance | 4Ω, 8Ω, 16Ω (switchable) |
| Dummy load function | None (Setting the volume to zero effectively makes it a dummy load) |
| Drive power supply | Must not |
- Pro-audio quality clear attenuation
It is hand-assembled by a long-established German audio equipment manufacturer, and minimizes coloration and thinning of the original sound. - Compatible with all impedances
A single switch on the back allows you to switch between 4Ω, 8Ω, and 16Ω, so you can continue to use it for the rest of your life, even if you replace your amplifier in the future. - Variable knob for stepless adjustment
In addition to gradual attenuation (-3dB, -5dB, etc.), the volume knob allows for stepless fine adjustment in the extremely low volume range, making it ideal for Japanese housing conditions. - Point-to-Point Cabling
The internal audio signal path is hand-wired without the use of printed circuit boards, delivering pure tube tone directly from the amplifier to the speaker.
This high-end attenuator was developed by SPL, a long-established German audio manufacturer specializing in professional recording equipment. While the circuitry itself is simple, passive, it utilizes top-quality components and point-to-point wiring to minimize coloration and thinning of the original sound. With no unnecessary features and the ultimate goal of simply lowering the volume, this unit has earned immense support from professional guitarists in Japan.
Positive reviews
- "The attenuator I used before had a terrible high-end loss, but this one doesn't lose much tone even at very low volumes, it's great."
- "The price is high, but the quality is so good that it's definitely better than buying something in the middle price range."
- "It doesn't impair the original sound of the amp, and its simple functions make it extremely easy to use during live performances."
Negative reviews
- "When the bass is set to a strong level, turning down the volume too much using the variable volume control can reduce the impact."
- "For a pure attenuator with no multi-function digital features, the price of about 8 yen is a bit daring."
Pochip
[Suitable for recording and home recording] Digital IR Load Box
Two Notes / Torpedo Captor X
| Circuit method | Reactive Load |
| Maximum Allowable Input | 100W |
| Impedance | 8Ω or 16Ω (select at time of purchase) |
| Dummy load function | Yes |
| Cabinet IR | Built-in (proprietary and third-party compatible) |
- High-quality cabinet simulator
By connecting with the dedicated app, you can intuitively edit a huge variety of cabinet and microphone combinations to create the ultimate line sound. - Built-in spatial effects
It is equipped with high-quality effects such as reverb, enhancer, and noise gate, allowing you to practice completely with just the main unit and headphones. - Stereo XLR output for live performance and recording
Since it supports stereo output, you can send a wide reverb sound or different cabinet sounds on the left and right to a PA or DAW. - Compact and lightweight housing
Despite its many functions, it is small and lightweight enough that it won't get in the way when placed on top of an amplifier head.
This hugely popular model is worthy of being called the "Swiss Army knife" for modern home recording guitarists. In addition to its superior basic performance as a reactive load, it also features powerful IR functionality that works in conjunction with the app. It also features a headphone jack, making it ideal for silent practice at night.
Positive reviews
- "Switching between cabs and microphones using the smartphone app is intuitive and fun."
- "It has built-in stereo reverb and enhancer, and sounds great on headphones."
- "It's compact and lightweight, so it doesn't get in the way even when placed on the head of an amplifier."
Negative reviews
- "There are only three attenuation levels to choose from (full, medium, low), so fine adjustments are not possible."
- "The maximum output of the amplifier is 100W, so it cannot be used with super-large amplifiers."
Pochip
Universal Audio / OX
| Circuit method | Reactive Load |
| Maximum Allowable Input | 150W |
| Impedance | 4Ω, 8Ω, 16Ω (switchable) |
| Dummy load function | Yes |
| Cabinet IR | Dynamic Speaker Modeling |
- Dynamic speaker modeling technology
It is equipped with the world's most advanced modeling technology, which reproduces not just IR (static data), but even the physical behavior and distortion of the speaker cone paper. - Built-in studio-quality effects
It comes equipped with UA's ultra-high-quality effects, including the 1176 Compressor and Plate Reverb, which are essential in professional settings. - Room microphone settings that control the atmosphere
You can precisely control the microphone distance and room reverberation (room ambience) as if you were actually playing in a studio. - Intuitive analog-like controls
Although it is a complex digital device, the front panel is lined with knobs like those on an amplifier, allowing for intuitive sound creation.
This is a top-of-the-line load box, used by top professionals around the world. UA's renowned analog modeling technology realistically reproduces the ambience of the microphone and even the distortion of the speakers. The superb tone, achieved with just the unit, is unparalleled not only for recording but also as a powerful line output for live performances.
Positive reviews
- "The recorded sound will sound exactly like it was recorded by an engineer in a first-class studio."
- "The room mic simulation is excellent, and the sense of atmosphere is on a whole different level than other equipment."
- "The attenuator function is very natural, and the sound of the original cabinet is excellent."
Negative reviews
- "The Wi-Fi connection is unstable and communication with the app is sometimes interrupted."
- "There is no ability to load third-party IRs (only the built-in cabinet can be used)"
Pochip
The ultimate multi-functional re-amp bass solution
Fryette / Power Station PS-2
| Circuit method | Reactive load + 50W vacuum tube power amplifier |
| Maximum Allowable Input | 200W |
| Impedance | 2/4Ω, 8Ω, 16Ω (independent input/output switching) |
| Dummy load function | Yes |
| Reamp function | Yes (50W 6L6 vacuum tube) |
- Reamping system for freely controlling volume
The amplifier output is first reduced to line level and then re-amplified by the built-in 50W vacuum tube amplifier, allowing you to fully control the volume while maintaining your tone regardless of the amplifier's volume. - Transform a small amplifier into a louder, live-size amplifier
It is possible to boost the sound of a small home tube amplifier, such as 5W, to a loud 50W that can rival the sound of drums in a live house. - Retrofittable effects loop
You can beautifully apply spatial effects such as delay and reverb to old Fender or Marshall amps that do not have a send/return. - Independent input and output impedance settings
This allows you to safely combine equipment with different impedances that would normally cause malfunctions, such as connecting a 4Ω output amplifier to a 16Ω cabinet.
This revolutionary device overturns the conventional concept of an attenuator. It not only lowers the volume of an amplifier, but also makes a low-output amplifier (such as a 5W) "louder" like a 50W stack amplifier. Because it uses vacuum tubes for re-amplification, it eliminates the coldness typical of transistor amplifiers, making it the ultimate solution when incorporating old Marshalls into a modern system.
Positive reviews
- "Even at full volume, the tube warmth and dynamics are never lost."
- "It's really convenient to be able to apply beautiful spatial effects to an old Fender."
- "It's magical to be able to take a little champ and make it sound like a live music venue."
Negative reviews
- "When the built-in cooling fan starts to spin, the noise is a bit annoying."
- "Because it is equipped with vacuum tubes, it requires regular maintenance and tube replacement."
Boss / Waza Tube Amp Expander
| Circuit method | Reactive load + 100W analog power amplifier |
| Maximum Allowable Input | 150W |
| Impedance | 4Ω, 8Ω, 16Ω (switchable) |
| Dummy load function | Yes |
| Reamp function | Yes (100W Class AB Analog) |
- Built-in 100W Class AB analog power amplifier
The sound captured by the reactive load is seamlessly re-amplified by a 100W power amplifier with a discrete analog circuit that preserves all picking nuances. - High-quality BOSS effects
Using the dedicated editor, you can freely route BOSS's vast number of high-quality effects, including compression, delay, reverb, and EQ, internally. - USB audio interface function
Simply connect the unit to your computer with a USB cable and you can record studio-quality cabinet sound directly into your DAW with high quality. - Instant Rig Switching and MIDI Control
Amp settings, effects, and IR combinations can be saved as "rigs" and instantly recalled from the unit's knobs or an external MIDI pedal. - Amazing 3D sound with headphones
Our unique spatial audio technology reproduces the realistic atmosphere of recording with multiple microphones even through headphone output, so your ears won't get tired even during long late-night practice sessions.
This truly is the "expanded command center for tube amps," created by BOSS, bringing together the best of Japanese engineering. It employs a re-amping system that combines an analog reactive load with a 100W Class AB analog power amplifier. It also features audio interface functionality and an IR loader, allowing you to complete any routing needs, from live performances to recording, all with just this one unit.
Positive reviews
- "It's an incredible feeling to be able to play a 100W Marshall at home at full power with headphones."
- "You can play the sound from the cabinet live and still send perfect IR to the PA."
- "This one unit is an interface, effects processor, and attenuator, so it's actually quite cheap."
Negative reviews
- "It's quite heavy and takes up a lot of space because it's rack-mounted."
- "It has so many functions that it takes a while to learn the detailed settings using the app."
Pochip
Summary | Find the best attenuator for your environment
Attenuators are one of the most common pieces of equipment that tube amp enthusiasts unanimously say they wish they had bought sooner.
- I want to practice at home on a budgetThen, "Passive Model"
- Pursuing the original touch of an amplifierThen, the "reactive model"
- Mainly late-night home recording and headphone practiceThen, "IR equipped model"
- I want to use it as the center of the entire system.Then, "Reamp Model"
Choose the one that best suits your playing style and purpose, and experience the "true cry" of your dormant vacuum tube amplifier.
\ Going to meet Sound House's sister /
An older sister I often seePlease use Sound House again next time.
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