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Behringer Truth B2031A - how truthful is it? (review / modding)

Could there a difference in sound between 2031a and 2031(passive version)? Anyone has any idea?
 
The passive 2031P has a relatively basic crossover (6 dB tweeter, 12 dB woofer), so more irregularities relating to that are expected. (There is a redesigned crossover for these.) On the flipside, I doubt that the passive XO would show as much sample variation... quality of adjustment seems to be all over the map with the 2031As.
 
Here are the frequency responses at the listening position in my test room compared to the average of good LS/monitors such as Neumann, LSRxxx, Linton etc. (in red):



B2031P


Klang B2031P.jpg



B2030A (Settings: Room -2)


Klang Behringer B2030A Room-2.jpg



B2031A (Settings: Room -6, High -2)


Klang B2031A Room-6dB HT-2.jpg



the older version B2031 was the best

Klang Behringer B2031.jpg
 
These speakers are interesting to me, they come from the before time, before music group started buying everything and a lot of behringers gear was pretty questionable compared to what it is now. Someone there seemed to try a bit with this product and the different revisions. I prefer the 2030 though, really awesome imaging. Behringer seems to have a great product they could sell for more, and improve upon easily but they don't seem to care much as long as they keep selling. They care so little that last time I ordered the 2030a's about 4 years ago, the box was labeled 5 1/4" woofer, but they have a 6"+ woofer. I found this mislabeling in a few other places.

Pros- really low self noise, great build quality, could take eq on the bass for days to get it flattened out, could get nearly PA levels in medium sized rooms, never got close to their limit they just don't seem to care what you put through them.

Cons - crappy power on/off procedure to avoid pops, questionable build in some areas, quality control, tweeter gets old after awhile

Want to talk about the power on/off thing. These things have two power switches, one on the top and one on the back that also controls auto standby. The top switch seems to control whether the unit gets power, and the rear switch enables or disables output to the drivers. When turning it on you want to have the REAR switch set to OFF. Then turn ON the TOP switch. Then turn on the REAR switch to On. Effectively you want the rear switch set to off when powering the speakers on or off to avoid the awful pop on these speakers have.

I had the passive model for a long time but sadly discontinued, active is still a good value but the tweeter made me sell them. I did some mods in the meantime. Couldn't EQ it to do what I wanted. The woofers construction is really ringy, the basket rings a lot and the magnet cover does as well. There's also a little chamber between the magnet cover and the magnet where I think air kinda bounces around and disturbs things but that could be also be nonsense.

I noticed that one of my speakers sounded a little muffled in a weird way. I tried to compensate with volume but that didn't work. Upon taking the tweeters apart I noticed one of the diaphragms was not seated into the magnet all the way. I had to kind of shape the voice coil a bit to get it in right. Measurements seemed show it was performing fine after that so I moved on. Shoddy QC though especially for something marketed as a monitor. The 2030a come with their own supposed measurement plot specific to the speaker but who knows if that's BS.

You don't need to remove the grill to get the tweeter benefits, just the little plastic diffuser on the inside. After the tweeter is disassembled I suggest pushing the diffuser out from the front vs. trying to peel it off from the back, peeling left annoying to deal with residue while pushing didn't. Blue is with diffuser removed.

View attachment 189342

The whole tweeter assembly has no wood behind it so it kinda vibrates in place.

The ports are really ringy, like if you tap any part of the front of the speaker you can hear the ports ring. Tap the ports and you get a pitched tone. I wrapped some thin rubber sheets around them then secured them with hair ties. It did this.

View attachment 189343
“ Cons - crappy power on/off procedure to avoid pops”

This issue arises because the designer lazily implemented a shared mute delay capacitor for six amplifier ICs. The capacitance used is based on the recommendation for a single IC, and it should be increased to at least six times the current value.
 

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“ Cons - crappy power on/off procedure to avoid pops”

This issue arises because the designer lazily implemented a shared mute delay capacitor for six amplifier ICs. The capacitance used is based on the recommendation for a single IC, and it should be increased to at least six times the current value.
Pin 8 on the PA chips is high impedance.
 
Hi everyone, new member here.

I know this is an old thread, but I am lost and just taking a shot in the wild right now.

I have a pair of these speakers, and they have been working flawlessly since 2009. No issues, at all. However, around 2018 for some reason, 1 of the monitors randomly shuts off. I have to basically turn them off then on again. No issues with the sound, same volume as the one that is working without issues.

So, i can sit and produce, then all of a sudden one can turn off. Be off for several days unless I manually turn them on/off, otherwise in a few days it can suddenly POOF wake up again and work as normal.
Now im guessing its something to do with the powersupply (sorry, might be obvious but im not so good with these things). Is there anyone who knows what might be causing this issue?

Thanks a lot in advance, I learnt a lot about my speakers from this thread.
 
Hi everyone, new member here.

I know this is an old thread, but I am lost and just taking a shot in the wild right now.

I have a pair of these speakers, and they have been working flawlessly since 2009. No issues, at all. However, around 2018 for some reason, 1 of the monitors randomly shuts off. I have to basically turn them off then on again. No issues with the sound, same volume as the one that is working without issues.

So, i can sit and produce, then all of a sudden one can turn off. Be off for several days unless I manually turn them on/off, otherwise in a few days it can suddenly POOF wake up again and work as normal.
Now im guessing its something to do with the powersupply (sorry, might be obvious but im not so good with these things). Is there anyone who knows what might be causing this issue?

Thanks a lot in advance, I learnt a lot about my speakers from this thread.
Does this phenomenon occur even if the 'Power Mode' on the back of the speaker is set to "ON"?
 
Does this phenomenon occur even if the 'Power Mode' on the back of the speaker is set to "ON"?
First off thank you very much for replying.

I never thought about that but you are correct, it seems to only work when Power Mode is switched on. Having it on either No or Auto doesn't turn it on (show green light for a second but then gone) at all.
But having it on Power Mode allows me to work with it, at least until it shuts off by own accord.

I don't know if it's relevant but I can't hear any difference in audio, volume seems pretty much on par with the working unit, the only problem being that it randomly shuts off.
 
First off thank you very much for replying.

I never thought about that but you are correct, it seems to only work when Power Mode is switched on. Having it on either No or Auto doesn't turn it on (show green light for a second but then gone) at all.
But having it on Power Mode allows me to work with it, at least until it shuts off by own accord.

I don't know if it's relevant but I can't hear any difference in audio, volume seems pretty much on par with the working unit, the only problem being that it randomly shuts off.
I've been using the B3031A for over 10 years, and recently replaced all the components with high-quality ones and made a few modifications.
It's a similar amplifier structure to the B2031A, with only minor differences. I'm very sorry about your situation.

I recommend that you stop using it immediately and never turn it on.

I have no idea what level of repair skills you have or your knowledge of electronics and electrical engineering, so it's difficult to tell you what to inspect.

If you're confident in your ability to disassemble the amplifier, I recommend taking detailed photos, writing a new post, and actively seeking assistance.
 
Some earlier posted the crossover diagharm of the B2031A to this thread

I recently bought many broken B2031A, mostly tweeters are bad in them

i dont like the original tweeter at all

I have many horns with compression drivers to go with the behringers original 8" woofer, i would like the crossover to be around 1,2khz

Also since CD/horn combo has much more sensitivity than the original tweeter/waveguide, the output of the tweeter amplifier should be lowered a lot

I tested the compression driver/horn with b2031A 8" with external Minidsp crossover/amplifier,at 1,2khz and i liked it a lot

and i would like to use internal crossover instead of external crossover/amplifier

If somebody could help me with lowering the original crossover frequency, i have no clue which values to change

I would use these as a part of atmos system, so as external, theres too many external amplifiers/crossovers needed
 
i dont like the original tweeter at all
FWIW, Amir tested the B2030P, which IIRC has the same tweeter. He called it "a calm amigo," IOW well behaved albeit a bit bright, which I found was quite easily tamed via DSP EQing based on Amir's measurements.
 
Hi may I know which one specifically?
Thank you very much and kind regards Gino
1095nsd with xt1086, very good combo

Personally i dont listen to dome tweeter speakers anymore, always real ribbon (no AMT) or compression/horn

So thats why, i would be happy if somebody could help me with crossover
 
Thanks a lot for the very kind and valuable reply
Maybe a powerful 10" in a bigger box could be a better option
You should find a service manual if available
I have a pair of these speakers as well
Actually i was thinking to change the woofers with something better
 
FWIW, Amir tested the B2030P, which IIRC has the same tweeter. He called it "a calm amigo," IOW well behaved albeit a bit bright, which I found was quite easily tamed via DSP EQing based on Amir's measurements.

It's not the same tweeter. The 2030's tweeter is smaller than the 2031.
 
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