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Amp mod - bridging the unbridgeable |
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Majestic 
Young Croc 
Joined: 16 March 2011 Location: Glasgow Status: Offline Points: 1292 |
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 Topic: Amp mod - bridging the unbridgeablePosted: 09 February 2012 at 10:04pm |
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Is it possible to bridge amps that do not have a switch and bridge outputs?
Edited by Majestic - 09 February 2012 at 11:29pm |
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GAZ.
Old Croc 
Joined: 16 January 2007 Location: Hertfordshire Status: Offline Points: 2428 |
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Posted: 09 February 2012 at 11:38pm |
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As far as I know, bridging 2 channels of an amplifier that is not designed to be bridged = Bang!
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100% Earth Moving Bass
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lgosdset
Young Croc
Joined: 28 September 2010 Location: Reading ish Status: Offline Points: 1203 |
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Posted: 09 February 2012 at 11:39pm |
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two red binding posts.
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4642a
Registered User 
Joined: 17 January 2012 Location: Colorado, USA Status: Offline Points: 13 |
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Posted: 09 February 2012 at 11:40pm |
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depends on the amp....
some amps have internal jumpers that are used to bridge the amp,
but w/o the service manual or other literature, you would not know this...
various HK Citation 16 amplifier variants were designed this way, with the internal jumpers and no
indication on the chassis or interior that the unit is bridgable....
so, what amp are you using?
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Majestic
Young Croc
Joined: 16 March 2011 Location: Glasgow Status: Offline Points: 1292 |
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Posted: 09 February 2012 at 11:53pm |
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i just bought these
is it possible? thanks
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djeddie
Old Croc
Joined: 26 April 2004 Location: Bristol Status: Offline Points: 4125 |
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Posted: 09 February 2012 at 11:57pm |
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Yes they can, as long as you do it properly.
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Chas n Dave : it's like Drum and Bass but with beards. E=mc² ±3dB
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VentureSound
Young Croc
Joined: 18 October 2009 Location: London N20 Status: Offline Points: 949 |
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Posted: 10 February 2012 at 1:37am |
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Just doing the two red binding posts alone won't work. First, you have to invert the polarity of one of the input channels. This is not as simple as swapping signal and ground because there will be no audio (these amps only have unbalanced inputs). You need an op-amp circuit to invert the polarity of the signal, and after that you can connect the speaker between the two red terminals.
In the case of the OMP amps, they will only work into 4 ohms, so after bridging you'll only be able to drive an 8 ohm load. Have a look at the link below, but if you are no good at elelctronics then some clever chap like Audiomik would probably knock you one of these up on a Sunday afternoon if you ask him nicely. http://sound.westhost.com/project14.htm |
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audiomik
Old Croc
Joined: 06 April 2010 Location: Bath, UK Status: Offline Points: 2956 |
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Posted: 10 February 2012 at 2:00am |
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Hmmm! don't need op-amps as there are much simpler ways - but that's a 'trade secret'
 Mik |
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Warning! May contain Nuts
plus springs, washers, screws, etc, etc. |
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odc04r
Old Croc
Joined: 12 July 2006 Location: Sarfampton Status: Offline Points: 5469 |
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Posted: 10 February 2012 at 9:48am |
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Insert signal into other side of LTP!
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The Builder
Old Croc
Joined: 03 January 2010 Status: Offline Points: 3107 |
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Posted: 10 February 2012 at 9:58am |
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I live close enough to have bought those. I didn't because of the bridge inability.
So, if you manage it, well done, and Grrrrr
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It just is.
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cravings
Old Croc
Joined: 30 January 2007 Location: Ireland Status: Online Points: 7508 |
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Posted: 10 February 2012 at 10:16am |
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i think i was told (i have 2 of these also) that using a balanced signal, you send the + to one channel and the - to the other channel and tie the grounds to screen... to give you the inverted ins.. i tried it, but i was really nervous and thought i smelt burning, so i kinda stopped hehe.
never tried again advise you to search for previous posts on this as this has come up before with these exact amps (also search for dna900) |
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studio45
Old Croc
Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3881 |
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Posted: 10 February 2012 at 12:28pm |
I've used these BK Elec based amps briefly; I managed to cock up a speaker multicore and ended up driving the output of one DNA900 into the output of another playing the next freq band, thru a driver. For several minutes at full power. The DC fuses just blew and the amps survived fine. This was after years of If you use a balanced XLR Y-Split and a phase inverting adapter, you can bridge these and it should be completely fine. Only of there is a fault with the amp will anything bad happen, and then, bad things were probably going to happen anyway! If it's really not happy the fuses will go almost instantly and if it overheats then the thermal breakers will shut it down. Bridge away!
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Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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cravings wrote: