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Home MASS 200 (200w Attenuator)
Item Code: MASS 200
MASS 200 (200w Attenuator) Item Code: MASS 200

MASS 200 (200w Attenuator)

  • Full attenuation: up to 120w amplifiers. Slight attenuation: up to 200w amplifiers.
$236.00

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This attenuator has two knobs for tonal control. The main volume is controlled by the large Speaker knob. Then to control the treble, use the Treble Compensation knob. The treble control is always dependent on the main volume control. Be aware that the higher the setting on the main knob, the less the effect of the treble compensation. For instance, if you turn the main knob all the way to 10, you'll notice very little change in the tone as you turn the treble compensation from one end to the other. The line out signal is dependent on your amplifier settings.


200 watt MASS with a moving voice coil speaker motor for the load. This unit is impedance swamped to protect the output of your tube amp, and may be used with 4, 8, and 16 ohm amps. Includes adjustable Line Out, System Bypass, and Variable Treble Compensation. Volume level is continuously variable to over 50db of attenuation.


Like all Weber attenuators, setting the speaker control to minimum (maximum attenuation), allows the MASS 200 to be used as a dummy load for testing or for DI use.


Optional wings may be employed for rackmounting the MASS (sold separately). The MASS occupies three rack spaces and requires adequate ventilation for proper operation.


This item is hand-built to order, to ensure the best attention to detail is paid to its construction.  We build them one at a time, on a table - not hundreds at a time on an assembly line.  This allows us to reduce the margin for error and produce an overall higher-quality product.  Please allow at least 7-10 business days for your order to be built and then shipped.

Features
Technical Details
Reviews

Details

More often than not, your amp's output is more than your ears can handle.  To maintain the tone of a cranked amp with saturated tubes and output transformers, a device called an attenuator is placed between the output of your amp and the speaker.  Weber offers a variety of attenuators for different applications.

A note about the power level: You should select an attenuator that can handle at least as much power as your amp puts out.* (see FAQ)

Amplifiers are generally designed to operate clean, and most manufacturers specify the output power as clean power. When you run the amp full blast, the output devices actually become more efficient because distortion is not considered. Under those conditions, the amp may be capable of putting out as much as 50% more power than its rated clean power. Be aware of that when choosing an attenuator, because the idea of using an attenuator is to run the amp full blast into power tube distortion and then controlling the level going to the speaker. If you are going to dime a 50 watt amp, you should choose a 100 watt attenuator.

 

Please read and consider the following prior to ordering an attenuator:
(The following text is reprinted with permission from Eurotubes http://www.eurotubes.com/euro-y.htm)

Here are some facts to consider when using an attenuator. Attenuators do work. They are not the cause of transformer failures. An attenuator can only simulate two out of the four components that are involved when you crank up an amp. The four components are #1 preamp tube distortion, #2 power tube distortion, #3 speaker distortion and #4 the physical movement of air that your speakers produce at high volumes. So the two components missing are speaker distortion and the physical movement of air and these are huge components! So if you’re playing at moderate volumes and just want to tame the amp down to get a bit of power tube breakup then an attenuator is a great tool, but do not expect to be able to dime your amp and then use any attenuator on the market to get the exact same sound from your amp at whisper quiet volumes. You can't get there from here. You would be better off with a one watt amp.

So, now some answers. Catastrophic power tube failure will cause transformer and screen grid resistor failures. The reason you will read and hear horror stories from un-knowledgeable attenuator users is because they do not understand how attenuators work and the stress they put on your tubes.  If in fact, a player chooses to run his amp cranked all the way on and attenuate the volume down to a whisper, then in most cases power tubes will only go a few months. Power tubes will die in one of two ways. The first and most pleasant is by simply fading and dying. The second and more popular way is to go out in a blaze of glory which is what I referred to above as a catastrophic failure which can and most often will, take out screen grid resistors.

Tubes sound great when they are really working hard but the harder you work them the faster they wear out. If you understand this and either use the attenuator sparingly or change your tubes regularly then your amp will not suffer damage.

If you are going to dime your amp out and attenuate it down to very quiet volumes then we recommend using an attenuator that is rated for twice the power of your amp's rated output.

If you are simply going to dial an amp up to where it starts to breakup in the clean channel and then knock it down a few dB so the club owner and the sound man are happy, then using a 50 watt attenuator for a 50 watt amp will be ok.

 

Understanding Attenuators
An article by Michael Farnsworth
This is a wonderful article written by one of our customers, which explains attenuators in even more depth.
CLICK HERE TO READ IT

Customer Reviews of MASS 200 (200w Attenuator)

Using this daily since 2013.

Tyler

February 07,2017
Using this daily since 2013.

I've been using this on a daily basis for years, in order to get a line level signal from my 100W Laney GH100S head for recording and rehearsing. No issues with the unit, or with my amp. Pair this with a decent cab sim, and you've got a nice silent setup.

A+!

Iron

June 21,2016
A+!

Absolutely awesome device. Johan Segeborn has a vid on youtube about bedroom volume being good enough, and he used a mass 150 to take it down to almost silent, and the results there are an excellent representation of the tone I'm getting with my mass 200. I lose no tone whatsoever until I am very quiet, and at that point it's just some sustain that's missing. But hey, at that point I'm using a cranked 100w marshall at tv volume... haha. At band volume (even a quiet band) it is 100% transparent. Time to crank it up, folks.

Proper high Gain, Saturation and Resistance with Simulated Cab

Nick Fainbarg

November 05,2015
Proper high Gain, Saturation and Resistance with Simulated Cab

On my mission to achieve proper high GAIN, Saturation and variable Resistance with Simulated Cab via Fractal Audio's Cab Sim Functionality I reached out to CJ to ask about the Genius moving voice coil load design....It works and I'm stoked. The power amp is responding as if it were connected to a cab.

What I needed

Sebastian

June 23,2015
What I needed

I got the 200w attenuator for my old 200w HIWATT Amp.
Cause it is far too powerful, i coudn`t get near the Sound, it was invented for.
This little black Box is exactly what i needed, to get a great volumed 70s Sound. No effects, just the pure clean sound of the Amp.
It took a while to get it through the Customs ( Germany) Let them tape the reciept outside of the Package.
Thanks, I love it.