posted
i remember, someone saying that it can and has been done.
assuming u have a low Voltage RCAs.. hook up the amp as normal, set the gains etc etc.
now , to connect the RCAs outputs do u just connect it to the speaker out terminals? ie. L +ve RCA = L +ve speaker outputs, L -ve rca = L -ve spk.... same for Right RCAs
How do u measure the RCA voltage (from the speaker output terminal) from the amp??
oh... can you do the above AND then hook up say rear fill speakers onto the same amp?
i have a spare small 50x2 amp, and not enuff RCA voltage
Posts: 303 | From: Melb, Australia | Registered: May 1999
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posted
Well, theoretically, a line driver IS just an amplifier :-)
So, it IS possible to use a small amplifier for this purpose, however that is a LOT of RCA voltage :-)
The RCA input on the other components ( IE after the amps) will have such a high input impedance that there would be no problem attaching speakers to that amplifier.
Interesting question, lets get some more thoughts on it peeps!
ShadowStar
Posts: 2578 | From: Somewhere In the Northeast | Registered: May 1999
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posted
You will want to use an amplifier that is NOT an IC amp. The amp should have mosfet outputs. Connect up your inputs, gain the amp almost all the way down, then as you said, output + to center pin on an rca, and output - to shield on rca. Plug in your next amp in line, and adjust the inputs as you normally would. You should probably use an o-scope to figure out max output from your amplifier/driver to get best non clipped signal from it, then you can set your downstream components accurately. The only problem you may have with running speakers off it as well as amplifiers that I can see is the relatively low volume level of those speakers, and the fact that you now will have a reactive load on the inputs of your downstream amplifiers. Feedback loop of the driver/amp could cause some serious problems due to this, but dont know, havn't tried that. Tech man will be the best to answer these questions...
------------------ STILL waiting to hear a GOOD pair of HLCD's!!
If it dont fit, force it... if it breaks, it needed to be replaced anyway...
The speakers will produce a voltage contrary to the amplifier's voltage when the coil moves in the magnet) which, when/if picked up by the RCA's, will cause HELLA noise...
I would say, if it isn't too much work, try it and test it. The phoenomenon above could be enough to ruin the whole idea, though.
Anything else?
:-)
ShadowStar
Posts: 2578 | From: Somewhere In the Northeast | Registered: May 1999
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posted
Another thing to watch out for. On some amps the + speaker output isn't necessarily the one that is driven. For example on some amps the right + connection is the one that has the output and the right - connection is grounded. Then on the left channel the + connection is grounded and the - is the one that has the output. This is done to remove the need for a bridging switch. So in this case if you try to connect the RCA's the way you say the left channel output would be connected to the right channel ground which could short out the amp.
My guess is that doing this way will create more distortion than simply turning your gains up on your amps. If you are driving lots and lots of amps this is a trick way of doing it, but I wouldn't think this is a great way to do it in a normal system where distortion is a factor.
Also I think the term for the voltage created by the speaker is "back EMF"
posted
Jimbo... How bout a real line driver.. I just happen to make them.. $85 US shipped Posts: 735 | From: Calgary AB | Registered: Oct 1999
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posted
in a SPL it would be a good ideal but in a SQ setup the noise would be horrible and THD+N would be in the 2% range so if you what a LD just see RW for one(plus a LD is a lot cheaper). A friend did this with an old punch 40
------------------ spydermann
Don't get caught in the WEB Gimmie some bass baby keep you RF and others, MTX for me Is that me in the top 10 now?? Do you smell what the BASS is cooking...
Posts: 6799 | From: cincinnati, oh, USA | Registered: Jun 1999
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