Truth B2031 Service Manual

Apr 16, 2020 Behringer TRUTH B2031 User Manual The manual explains how, where, and at what angle you want to place your monitors, and what settings you want to use for different room sizes. Blown fuses may only be replaced by fuses of the same type and rating. Front panel display elements Fig. The user should not attempt to service the appliance beyond that which is described in the Operating Instructions. All other servicing should be referred to qualified service personnel. TRUTH B2031 This symbol, wherever it appears, alerts you to important operating and maintenance instructions in the accompanying literature. And come up with the TRUTH B2031. The manual actually refers to these monitors as just the ‘TRUTH’, resulting in such gems as ‘Use the Power switch to put the TRUTH into operation’. If only life was so simple! (Just don’t leave them around where your significant-other may find them!). 3TRUTH B2031A/B2030A User Manual LEGAL DISCLAIMER LIMITED WARRANTY Terminals marked with this symbol carry electrical current of suffi cient magnitude to constitute risk of electric shock. Use only high-quality professional speaker cables with ¼' TS or twist-locking plugs pre-installed. Active 2-Way Reference Studio Monitor. The TRUTH B2031A is the improved version of the best selling B2031. With the B2031A, we have developed an active 2-way studio monitor with XLR and balanced 1/4 'TRS jacks, which provides a neutral sound and a linear frequency response (50 Hz - 21 kHz).

Hey, I've got one.but found making the patches wasn't really the hard thing to do. You just scroll thru the sounds, and pick what you want.and you can basically only layer one sound on top of it. Then adjust your parameters, balance, effects, and such until you like what you hear. Best begginer lockpicking set. There are some good ideas however, such as taking a piano sound, and layering another piano sound on top of it.an octave up. Using the transpose can help to get some more unique kinda sounds. Accessibility settings in mac os x.

I haven't gotten into split patches or transposing other than octaves at this point. I find making a 'lead' patch.adjust it.then find a subtle 'backing' patch to add to it, seems to work best. Like combining two bass sounds.strings with the voices.

Not to mention using the MIDI and plugging into another synth.If you find a source for ideas/patches.I'd be interested too. Originally posted by nchapmanI agree with what you said, it is a fairly simple procedure to pick a sound and layer it or change it's effects.I know however there are very bright audio genius's who have already come up with new exciting sounds - you may be one of them. I'd like to see a group of us pool our resource time on this issue and share what we've done so we're not reinventing the wheel, so-to-speak.If we created a format we could simply upload a few of the settings to each other.Whatcha think??and let me ask stupidly.how would we upload patches??Alan.I'll answer for Neil.I love the GR-33, and I think you would too. I have to second MIXMKR. It really is easy to use once you understand the settings. Ya know it also helps to read the manual I'm using mine to record to Cubase via Tascam US-428 digital mixer.

GR-55 FloorBoard is a small, easy-to-use application specially designed to offer you a MIDI editing tool for use with the Roland GR-55 guitar synthesizer. This tool allows graphical representation of the internal settings and parameters of the GR-55. Realtime editing and patch data backups are also offered. Reading a little more my options are reduced to a Roland gr 20 or 33. As I know Gr 33 is bigger, has a multi effects (that i don't need now, because my vox dynamic works really well), and a real option for editing the sound; also it's a little more expensive in used market. But I don't know if it's older than Gr 20 and his response to playing.

Although the MIDI leaves a bit to desired (at least for me the MIDI seems to not hit the correct notes, at times) I do like, very much, the range and control for sounds in recording. I don't play live anymore but others I've heard love this unit for live play.To answer MIXMKR - we wouldn't be uploading patches per say we (or I) could create a table that lists the settings under COMMON / TONE / EFFECTS. It should be as simple as just putting an X in the box for the active setting (or something like that.)Again, WHATCA think??

Cheap German knockoff is not a phrase usually seen, unless talking about audio, and then there is a 100% chance it's in reference the Behringer. The scandalous amount of knockoffs they produce range from guitar pedals to mixers, and yes even studio monitors. The German part is mostly gone from Behringer, who were early adopters of outsourcing to China. In 2002 they completed their own factory in Guangdong tastefully called Behringer City. Knowing them they probably ripped off the floor plans from Foxconn City.
The Truth 2031A's are a design stolen from Genelec, the 1031A, made from 1991-2005. The Genelec 1031A was a ground breaking design that was the first waveguide studio monitor, and while not produced anymore can be picked up for a cool $3-5k/pair on the used market. The Behringer knock off is dirt cheap, at $400/pair and has been the speaker of choice for many objective audiophiles like the old dudes in SMWTMS.
This is speaker with its budget price, and big size/performance is direct competition for the venerable JBL LSR308. I'm hoping for a new leader in the cheap/good/loud category, let's see how it does.

Components:

Waveguide Tweeter

Tweeter is a 1 inch titanium dome with a built in grill and a waveguide that surrounds it. The waveguide is supposed to direct the sound forward and match the dispersion pattern of the woofer. A bit different from a horn which has the dual function of pattern control and making sounds louder.

Back of the tweeter looks pretty good, it's got a small magnet and a little backing magnet as well. The plastic waveguide seems more sturdy than the one found on the JBL LSR series speakers. Stickers claim 50 watts RMS power handling and 8 ohm impedance.

Woofer

The Behringer Truths got a little dusty waiting to be reviewed. The woofer cone is made of some polypropylene type plastic, and the tiny dust cap is very soft and prone to denting. The surround is a stiff butyl rubber. Given the size of the surround I'm not expecting big excursion from this woofer, but it's almost 9 inch diameter so won't need to move as much as smaller drivers. The specs say bass rolls off at 50Hz, and this driver should have no problem hitting that mark.

This has to be the most impressive speaker driver I've seen in a speaker priced this low. The basket is a massive thick cast aluminum, spider looks quality, and the shielding of the magnet is damn near 100% effective.

This sticker that has some specs on it is pretty fancy given that the B2031A speakers are not meant to be taken apart. Note the vented pole piece for lower heat buildup, which makes for less distortion and improved power handling.

Amplifier

Behringer includes a large manual along with the Truth B2031A speakers, but everything you need to know is painted right on the back of them.
Note that the -6db for Room Compensation, even though indicated by the markings is not available in the movement of the switch. Everything else worked as advertised and is probably easier for you to read from the image than for me to retype.

If you know what you are looking at I'll give you a moment to pick your jaw up off the floor. I know I was awe struck by this sight for at least a good 5 minutes.
What we have here is 3 TDA7293 Class A/B chip by ST, two are run in parallel to power the 4 ohm woofer, the single is powering the tweeter. The shared power supply is using a toroidal transformer, two nice large smoothing caps, and it's all put together under a very thick sheet metal housing that acts as a heat sink.
If a stereo equivalent of this amp was put on the market by itself I would have no problem paying $150 for it. The quality of the components and soldering looked great, and the fact that this is stuck on the back of a $200 studio monitor is completely absurd.

Cabinet

Prepare for more insanity. MDF quality is very nice dense stuff, not the usual chinesium crap. The front baffle is a complicated heavily machined piece which is 1/2 inch behind the tweeter, and 1 1/8' behind the woofer which is precision flush mounted to the surface. The center brace is a solid 3/4 inch piece and all of the cabinet walls are covered in a thick carpet padding type material. This is a better box than the Infinity Primus, which was over built massively for the price point. I would say that only the B&W 686S2 beats the Behringer Truth's in cabinet construction quality of reviewed speakers.

Port

The two ports flank the tweeter in an arrangement I have not seen in anything else except the Genelec. The ports themselves seem like thick enough plastic to stay put and not break. I have no idea how these are tuned given bizarre shape and 7 inch depth. I'll assume that Behringer got this right, or at least copied Genelec without screwing up too much.

Office Setup:

These are big and heavy speakers, I've got my stands set for 5 inches which puts the tweeter at ear level if I sit up straight. directly between the woofer and tweeter if I'm sitting comfortably. I'm using the Lexicon Alpha USB DAC/Mixer, and you should too... it's bad ass for speakers with balanced inputs. Running balanced cables to the monitors gives a clean signal and enough gain to drive a train.

Listening Notes:

On a desk the speakers sound large, what that means is that I don't feel the need to turn them up much at all. The wide baffle means that more of the sound that the speaker is producing is being projected forward. This gives the effect of more music at lower volumes when you are sitting right on top of the speaker in the near field. On the downside it does mean that the imaging is going to be limited, and the speaker will sound like it's too close.
The speakers are doing the waveguide thing and not projecting any image outside of the width of the speakers. I give up all hope of coupling with the room and toe the speaker a little to try and hit more of the direct sound on the side of my face. The best imaging performance, like most horn/waveguide speakers, is likely to be found using corner placement with lots of toe in. On the plus side, the center image is nailed to the cross, and as solid as any system I've heard.
Putting on a familiar test track I hear the midbass is a little thick in the flat setting. Reading the thourogh documentation on the back of the speaker I adjust the bass -4db for the close(slammed) to rear wall placement and noticed the -6db, even though indicated by the markings on the back of the box is not available in the movement of the switch. Regardless I'm able to get the setting I need set and move the chunks of speaker back into position.
As was the case in some early living room tests the speakers produce some of the cleanest bass I've heard. There is a bump around 100Hz that gives a tactile sensation for kick drum material. The bass is very tight, and extremely defined. There is no mistaking the bass guitar for a bass drum.

The highs are too much, just a little too live, and maybe slightly on the harsh side. I think the metal dome and waveguide are the culprits, but it could be cone break up from the large woofer. I will need to wait for close mic measurements before I can find out.
Separation of music elements is great, and acoustic guitar clarity is a little overdone.
80's tracks are more dry than they should be. I would like some more bass gain from the wall to compensate, either that or a little less treble. On the plus side there is a shit ton of clarity. Extremely clean amplification, zero cabinet issues that I can hear, and the whole package is all very impressive for such a relatively unassuming pair of speakers. The Truth monitors are living up to the hype.
While listening through a few other tracks the treble starts to bother me. Not just the quality, but the quantity. Turning again to the literature on the back of the speaker it suggests for a live room, which I definitely have, to knock down the treble 4dB. I give that a shot, but it sounds too muffled. I flip the switch to -2dB, and the clicks and pops of Kraftwerk are now mostly enjoyable instead of anoying. The slight harshness is still there in the in the highest highs, but it's not too bad.
These speakers are sounding acceptable now. The Behringer Truth monitors are providing a viseral emotionally ready connection. Just bring your tunes and strap in. A good speaker can provide this without going into full retard with the volume knob, and I'm only cranking 85dB and these are making my hair stand on end and skin crawl with quality music performance.

Measurements:

This is the on-axis frequency response of the speaker measured outdoors. Looks pretty good, but nowhere as good as the JBL LSR series. Looks like I was either a little off axis, or wind noise rejection cut the response above 12kHz. There are some chunky peaks around 6kHz and 11kHz, as well as some serious nasty bits in the 600Hz range, and a hump at 120hZ. The bass roll off of 50Hz looks to match the spec, and is not super impressive for such a large driver/box.

This is the same as above, except working the room compensation(0dB,-2dB, -4dB) and High Frequency adjustment(+2dB,0dB,-2dB,-4dB).

Here is the off-axis response of the speaker from 0-75 degrees in 15 degree increments. Drop off looks pretty uniform, which is a credit to the waveguide doing its job.

This is close mic measurements of the drivers. This speaker has switch on the back to cut off either the woofer or tweeter, so there is no interference between drivers in this measurement. Crossover point looks pretty low at around 1800Hz, and the slopes appear to be 24dB/octave on the tweeter and 18dB on the woofer.
Tweeter looks a little rough, and I'm guessing the that grill or metal dome has something to do with it.
The woofer has a null at 600Hz and peak at 800Hz. This anomaly is visible in all of the measurements so far. This could be from sound leaking through the pole piece venting and dust cap to cancel out the sound, or it could be diffraction effect from the surround of the woofer, or something else all together.
Ports are putting out a good bit of content in the 30Hz range even though there is not much happening with the speaker at this range, and leaking sound between 250-400Hz. I'm not very impressed by the results of this porting.

Hack and Slash DIY Modification:

While listening I kept thinking that the tweeter grills were, 1. Retarded, and 2. Getting in the way of the speaker doing its best. Well, I tried paper clips and brute force from the outside, but the tweeter wasn't having it. Instead I had to disassemble the tweeter driver itself. What I found was surprising. There was not just a metal grill, but also a little circular piece of cellophane tape in the middle of the grill that acts as a diffuser.
I hate diffusers too, so this is modification double plus good in my book.

All of the screws are exposed to take the driver apart, so it's not a hard job, but it is a little nerve racking to pull a voice coil out of a done tweeter. Just make sure you line up the holes with the posts on the motor when putting everything back together.

These look 100% better. World class bad ass, letting that titanium get some air.

Not only do the speakers look good now, they measure better as well. This is 2 sets of measurements, far and close micing of the tweeter with before and after removing the grill. Removing the grill smoothed out the tweeters response considerably.

Modified Listening Impressions:

The sound better to me, especially near field. They seem to have gotten a little louder, but also smoother sounding. I think this modification is well worth it if you are sitting close to the Truth Monitors.

DSP Correction:

This DSP correction is designed to be used with all the adjustment switches set to 0dB on the back of the speaker.
Let's talk about that bass boost. Yes I am pushing 16dB of bass boost below the port tuning of the speaker. This does mean that the speaker is more likely to over extend the woofer, but the -3dB point is 28Hz now and that is something very interesting.
How did I get away with this, well there are a couple of things. The speaker is very sensitive to gain, especially when using balanced connections, and has a nice low noise floor. This means that even though I'm cutting 16dB of gain out of the digital signal there is still plenty of room left in the volume knob for making the speakers louder than they should play. The next reason is that these speaker are proper fucking loud. They are speced by Behringer to play 116dB at 1 meter without distortion. That means that with this bass boost you will be limited to only 100dB, which is still really fucking loud.
The rest of the corrections are minor tweaks getting rid of harshness here and there that either showed up in measurements or in listening.

Corrected Listening Impressions:

With the grillless tweeter and 29Hz bass extension this speaker is surprisingly not that different than it was for most music. Bass is a little less punchy and instead deeper. Music is a little more clear, and a little more smooth, and a little more refined. Still the tweeter is the weak link on this speaker, and unless you want to try and DIY a soft dome into the speaker or add some felt to the wave guide I don't this you can fix it. The bass response is still super clean and beats any budget subwoofer I've used in the past. Not only that, midbass clarity is not compromised by the added extension. Even in movies the bass is smooth and understated, not a rumble clusterfuck that you get from floppy bass cannons.

Final Thoughts:

Behringer Truth B2031a Service Manual

In stock form the Truth Monitors provide some of the best mid bass clarity that I've heard from a 2 way speaker. It's a shame that the tweeter is not as good as the one on the JBL's, and will probably bother you at some point while listening to them. For living room use without DSP correction I would say the Truth monitors are preferred if the JBL LSR308's don't get loud enough. Also, if you are a home theater person(I won't judge) you are going to need a subwoofer if you need deep bass response.
If you are planning for desktop use keep in mind that the Behringer Truth B2031A speakers are huge, and were too big for my tiny desk to get the best imaging. Best placement is probably a little outside of the near field(arm's reach) and closer to side walls. Downside is that you don't want too wide of a placement, so you need to sit further back the wider you set the speakers. Placement is going to be a balancing act of compromise, but if you want loud, well built, clean speakers, these fit the bill.