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Old 2nd November 2014, 08:19 PM   #1
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off-topic posts from What's the best pair of speakers you've ever heard?


I am running a pair of these Behringer Truth B2031A active monitors.
Now modified, these are one of the best loudspeakers I have heard.

As standard they were sending me out of the room, now they are pin sharp in clarity/detail, centre, width and depth imaging.
These loudspeakers are both clinically detailed and perfectly musical, and go pretty loud.
These are seriously good fun, and at their price point quite unbeatable.

Dan.

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File Type: jpg behringer-truth-b2031p. - pair.jpg (8.2 KB, 905 views)
File Type: jpg Behringer b2031a - internal - 2.jpg (64.3 KB, 909 views)
File Type: jpg Behringer b2031 - internal.jpg (71.7 KB, 1063 views)
File Type: jpg behringer-truth-b2031p - cad.jpg (13.7 KB, 895 views)
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Old 2nd November 2014, 08:56 PM   #2
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Default Max's Behringers

Quote:
Originally Posted by Max Headroom View Post
I am running a pair of these Behringer Truth B2031A active monitors.
Now modified, these are one of the best loudspeakers I have heard.

As standard they were sending me out of the room, now they are pin sharp in clarity/detail, centre, width and depth imaging.
These loudspeakers are both clinically detailed and perfectly musical, and go pretty loud.
These are seriously good fun, and at their price point quite unbeatable.

Dan.

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Exactly what modifications have you done to them?
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Old 3rd November 2014, 01:03 PM   #3
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by Rullknufs View Post
Exactly what modifications have you done to them?
Yes, do tell us. as standard, according to some accounts in the other thread these beat Linkwitz Orions.
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Old 3rd November 2014, 06:02 PM   #4
pguerin is offline pguerin  France
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Quote:
Now modified, these are one of the best loudspeakers I have heard.
Max Headroom, do tell us
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Old 3rd November 2014, 10:36 PM   #5
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I will post pics and explanation tonight.

Dan.
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Old 4th November 2014, 02:02 PM   #6
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Default Polishing A Turd...

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Originally Posted by xrk971 View Post
Yes, do tell us. as standard, according to some accounts in the other thread these beat Linkwitz Orions.
Hmmm, the Orions are a completely different beast are they not ???.

My Behringers are really just conventional 2 way cabinets with Behringer's crossover/amplifier module tacked on the back.
The tweeter is mounted to a shaped/short horn/waveguide front plastic panel that screws to the front of the cabinets.
The tweeter claims titanium but doesn't look anything extra special.
The woofer looks quite decent and incorporates a very substantial magnet assy.
The electronics is balanced input/level/crossover stage (all 4580 opamps) feeding LM3886 amplifiers.
Behringer - B2031p - Schematic - Crossover.pdf
Behringer - B2031p - Schematic - Output.pdf

At this point I have very deliberately avoided making any changes to the amplifier module whatsoever, for now.

My mods so far are....
Changing out the speaker cable assy to enamelled 1mm wire, using new Molex and spade connectors.
Removing all original damping material.
Using 'acoustic pinboard' to line the rear panel (two pieces).
Cutting two panels of the pinboard and curling them around to form tubes that fit precisely into the front panel driver cutouts.
These 'tubes' finish around 2cm short of the rear panel.
The tube behind the (closed back) tweeter is intended as 'freestanding' acoustic damping material.
The 'tube' behind the woofer is intended as the same, and also forms a 'port' of sorts.
Trying the spoken/ummm/oooooh/ahhhh testing sounds into the original cabinets excited all sorts of booming and emphasis.
Doing the same into the relined versions, I could not excite any resonances...just well behaved, with really good damping.

The result now is a pair of speakers that have clarity and dynamics to die for.
Anywhere around the house and the sound is great, in the sofa sweetspot the imaging is quite spectacular....according to the recording, sounds come from precisely placed locations across the room, and from miles through the wall.....from behind the listener also.
Because of this hologram 3D positioning, every instrument/sound source is perfectly and easily discernable.

This simple set of mods has quite transformed these speakers.

Dan.
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Old 4th November 2014, 04:37 PM   #7
xrk971 is offline xrk971  United States
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What is acoustic pin board?
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Old 4th November 2014, 09:21 PM   #8
pguerin is offline pguerin  France
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Thanks for sharing the infos Dan,

Quote:
What is acoustic pin board?
Seems to be this kind of product :

Acoustic Pinboard - Speciality Panels - Building Products & Surface Materials | Gunnersens

Ps : look at the monitors on the picture

Last edited by pguerin; 4th November 2014 at 09:24 PM.
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Old 4th November 2014, 10:16 PM   #9
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Quote:
Originally Posted by Pascal GUERIN View Post
Thanks for sharing the infos Dan,
Seems to be this kind of product :
Acoustic Pinboard - Speciality Panels - Building Products & Surface Materials | Gunnersens

Ps : look at the monitors on the picture
Yes, that's the kind of stuff....looks like and feels like very dense felt sheet.

I am running balanced feed from Behringer line amp stage, and balanced 240V feed from medical grade 240V isolation transformer.
These speakers a very revealing of absolute polarity...my solution is to wire a reversing switch directly on the 6.5 mm input plugs feeding the Behringer preamp.
I intend to fit Zobel networks across each of the drivers soon.

I also have a curved sheet of cardboard directly behind each cabinet....this will change to curved sheets of carpet in time.

I also have another pair of these speakers in factory original condition...this will give me possibility of easily comparing boxes, and easily comparing amp modules when I get to doing electronics mods.

Dan.
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Old 4th November 2014, 10:47 PM   #10
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by Max Headroom View Post
Yes, that's the kind of stuff....looks like and feels like very dense felt sheet.

I am running balanced feed from Behringer line amp stage, and balanced 240V feed from medical grade 240V isolation transformer.
These speakers a very revealing of absolute polarity...my solution is to wire a reversing switch directly on the 6.5 mm input plugs feeding the Behringer preamp.
I intend to fit Zobel networks across each of the drivers soon.

I also have a curved sheet of cardboard directly behind each cabinet....this will change to curved sheets of carpet in time.

I also have another pair of these speakers in factory original condition...this will give me possibility of easily comparing boxes, and easily comparing amp modules when I get to doing electronics mods.

Dan.
Do you have measurements of the speaker after your mods. I am not so sure that putting tube right tightly around the woofer is good, I think generally you want to allow free flow if air around the back of the cone and to avoid surfaces (even absorbing material) right next to the back of the cone. But measurements would prove it all to be worth it.
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