CLICK HERE TO READ THE ATTENUATOR FAQ
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.
There is an option to add a headphone output, and this adds an extra jack with an independent volume control. For the footswitch option, we install a relay which requires 7.5V external power. This only powers the relay – the attenuator itself is still passive. We include the power plug but the footswitch itself is not included. You can use any latching footswitch, including one incorporated in a multi-effect floor unit.
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.
IMPORTANT NOTE ABOUT HIGH GAIN AMPS*: *if you have a Fender or similar amp, and play with cleaner tones, this part does not apply to you. High gain amps such as Marshall or clones (with heavy distortion) are hard on attenuators. Unfortunately, an amp’s volume dial is not a good indicator of how much power is being produced. Many amps can reach full power at 3 or 4 on the volume dial, so it is a good suggestion to get an attenuator with 4x the power handling. For example, if you have a 50w high gain amp, you should opt for the MASS 200. If you have a 100w amp, you should still go with the MASS 200 but you should not crank the amp.
1) do not attenuate too far down. this puts a lot of power through a very small section of the volume rheostat which can cause it to fail
2) also do not turn your amp all the way up. even if you’re just knocking a little off the top with the attenuator, it’s a good idea to keep the amp somewhere in the middle at most. it’s best to find the lowest volume on the amp that is the acceptable tone to you, and then use the attenuator to bring it the rest of the way.
CABLES: for combo amps, most people like to set the unit on top of the amp. sometimes there is enough slack in the speaker wire to reach and sometimes there isn’t. these cables will make it work for you: GMC2P and GMC2E If the speaker is hardwired, then you need the PV30MH. (click the links to view them, and add to your order if you need them.)
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Sebastian –
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.
Nick Fainbarg –
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.
Iron (verified owner) –
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.
Tyler –
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.
Matt McCool (verified owner) –
These attenuators are serving me well. I think that if anything, I will use them to take the last 1 to 4 dB off the top if the sound is too loud for the room. Mostly I will not use these unless I have to.
I had an uh-oh moment when the shipping company sent me damaged gear. I didn’t notice that an input channel on my cabinet was an open circuit because I was connected in stereo. If I didn’t notice that 2 of these speakers were silent and I brought this on stage with a false pass with equipment testing, I could’ve damaged the amp and blown the speakers. Using these attenuators prevented any risk of damage with the way I configured it. Luckily I solved the problem before it came to that and I am thankful that these devices acted as a failsafe.
What I found out in this experience is that this manufacturer was very supportive and helpful when I needed it. I am happy and impressed with both the customer service and the device.
dberto@comcast.net (verified owner) –
Purchased my Mass200 to tame down a few amps for home use (and some minor dates I will still play occasionally) . Specifically an SV20H, JCM800, and a few others. It works EXACTLY as I had hoped. I am not necessarily running the amps at whisper volume but to a tolerable home loudness. I do not detect any “tone suck” of any sort. Just getting my cranked amps a bit more under control with the same cranked tones as I get with the amps running wild. The treble compensation works great also, although I have used it more to darken up one amp in particular I always thought was a big bright. I think it was a great purchase and a fantastic product.
austingreenphoto@gmail.com (verified owner) –
Just received my Mass200 yesterday and immediately hooked it up to my late 60s Fender Twin reverb (***85 watts or so; volume level references should be true for most high powered Fender Amps >50 watts). I put it through the paces for hours. WOW… what an absolutely fantastic product. You can use it to take a few db off the top to get a better clean studio tone (Speaker volume up a touch, Amp volume around 3 or 4), or you can turn the amp way up (7 or 8) and increase the speaker volume to rock out at a level that won’t make you go deaf. I can now hit the sweet spot at a safe volume!
Other perks… 1) Headphone jack option is a must. Turn the speaker volume to it’s lowest level, turn the amp back down to 3 or 4, unplug your speakers, plug in the phones, turn up headphone jack volume, and get beautiful clean tone in a good set of headphones! Your wife or neighbors will love you again! 2) With Mass200 and Amp volumes set to reasonable levels, your idle amp tone is super quiet! No more unbearable tube hum with your distortion pedals engaged. 3) No more fears of going deaf! This one is important!