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Old 26th July 2003, 04:07 PM   #1
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Default Subwoofer Plate Amp

I'm thinking of building an active subwoofer using this amplifier http://www.advanceae.com.au/car/prod426.htm. however i'm not sure how i'm going to control the volume of the sub if i use the low level input (RCA). I'm going to have a go at building my own stereo amp for the mains (hopefully a gainclone) and i want to put a set of pre-outs or a mono preout on it that can feed the subwoofer amp which has a built in crossover. I want the preouts to be controlled by the main volume control on the amp. however i thought the idea of a pre-out was that it wasn't volume controlled at all yet i see home theatre recievers with subwoofer outputs so i assume there is a way to do it. thanks for any help.
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Old 26th July 2003, 06:45 PM   #2
jleaman is offline jleaman  Belgium
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If i'm correct most plate amps have a hi pass input and a low pass 9 rca 0 the hi pass allows you to attach the speaker outputs from your amplifier outs ( speaker out a - b ) if you need any more help let me know.. ..
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Old 26th July 2003, 11:28 PM   #3
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Default Re: Subwoofer Plate Amp

Quote:
Originally posted by amoeba86
I want the preouts to be controlled by the main volume control on the amp. however i thought the idea of a pre-out was that it wasn't volume controlled at all
You may be thinking of tape monitor outputs, which run at full volume all the time. Pre-outs are affected by the main volume control - look at any component preamp, or for that matter a car stereo head unit, both of which are examples of devices made to connect to a power amplifier (which likely has no volume control of its own).

So yes, if you're planning on building your gainclone with a volume knob (in other words a preamp stage) and pre-outs, the pre-outs should be post-volume control. And that's how it's normally done, so no worries.

JasonL is correct that you could simply run speaker wires to that sub amp and daisy-chain them along to your speakers, but down-converting a speaker level signal to drive your sub amp may add a bit of noise and distortion. It might not even be audible, but something to consider. You'll have to work out whether it's worth the extra trouble of adding pre-outs to your main amp for the possible sonic benefits and flexibility down the line of having extra connectors for additional/different amplifiers.
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Old 27th July 2003, 12:23 AM   #4
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ok thanks, i think i wasn't fully understanding how the pre-outs worked, i know this isn't the chip amp forum but could someone possibly show me how i would integrate a set of preouts that are controled by the main volume control, i don't have to worry about summing or anything since the plate amp does that.
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Old 27th July 2003, 12:27 AM   #5
jleaman is offline jleaman  Belgium
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if you get a plate amp you dont need a pre out as the plate amp will have hi' pass inputs. yu can hook up the amp directly to it via hi pass. : O ) do you want me to draw it for you..?
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Old 27th July 2003, 03:37 AM   #6
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Quote:
Originally posted by JasonL
if you get a plate amp you dont need a pre out as the plate amp will have hi' pass inputs. yu can hook up the amp directly to it via hi pass. : O ) do you want me to draw it for you..?
My point before was that he might not want to do it that way, even though he certainly can. Either way, I doubt anybody needs any pictures drawn of how to hook up the speaker wires.
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Old 27th July 2003, 03:57 AM   #7
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You might want to look at site www.apexjr.com for a plate amp
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Old 27th July 2003, 06:50 AM   #8
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yeah i know i can use the high pass connections however i don't really want to because of the extra distortion and also having to run all the cabling to the sub. i would rather just run a single RCA cable to it and go without the distortion.
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Old 27th July 2003, 06:53 AM   #9
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Witch channel are you going to use to drive the sub then left or right. I think you might want to look into Circuits that use both left-right to combine the signal so that way you get all bass notes. If you listen to one side it can be different than the other.
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Old 27th July 2003, 06:56 AM   #10
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why do you say distortion?....I run alot of line level cable and do not have any?
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