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Old 28th November 2009, 11:53 PM   #1
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Default Speaker Bi-Amping / Crossover

Hi,

I have a set of custom speakers built out of the older Infinity SM-155 series. Basically there's 2 of the SM155 Tweeters, 2 Of the Mid-ranges and 1 Cerwin Woofer. I blew the crossover in one of them.

//Edit the crossover, is also just the stock. SM155 Crossover.

I would like to bi-amp them as my denon 688 is not really powerful enough to run them whole. Currently they are single post. i would need to change the backplate, I have 2 bi-amping plates from parts express.

I understand with bi-amping on the 688 I'll loose my ability to do 7.1 that's fine with me. What im confused about is, to my understanding with bi-amping i can go active, so i wouldnt need the crossover. Would this work with the 688 or would i still need a crossover and how would i wire all this up. I looked on parts-express for crossovers, but couldnt seem to find what i needed.


Some help would be greatly appreciated,

Thank's
Igor

Last edited by igorcherfas; 29th November 2009 at 12:01 AM.
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Old 29th November 2009, 12:59 AM   #2
jleaman is offline jleaman  Belgium
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Quote:
Originally Posted by igorcherfas View Post
Hi,

I have a set of custom speakers built out of the older Infinity SM-155 series. Basically there's 2 of the SM155 Tweeters, 2 Of the Mid-ranges and 1 Cerwin Woofer. I blew the crossover in one of them.

//Edit the crossover, is also just the stock. SM155 Crossover.

I would like to bi-amp them as my denon 688 is not really powerful enough to run them whole. Currently they are single post. i would need to change the backplate, I have 2 bi-amping plates from parts express.

I understand with bi-amping on the 688 I'll loose my ability to do 7.1 that's fine with me. What im confused about is, to my understanding with bi-amping i can go active, so i wouldnt need the crossover. Would this work with the 688 or would i still need a crossover and how would i wire all this up. I looked on parts-express for crossovers, but couldnt seem to find what i needed.


Some help would be greatly appreciated,

Thank's
Igor

You would not be able to go active with this, as you have a surround sound receiver, if you wanted to go active you need a 2 channel amp for each crossover-bi amp.

IE, 2 channels for the mids tweeters, and 2 channels for the bass drivers.
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Old 29th November 2009, 01:01 AM   #3
Key is offline Key  United States
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If he has individual volume controls on the front and back channels it could work. You'd either have to come up with an active buffer before the amps to replace the crossover or use DSP filters and feed it from a computer though.
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Old 29th November 2009, 01:04 AM   #4
jleaman is offline jleaman  Belgium
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Quote:
Originally Posted by Key View Post
If he has individual volume controls on the front and back channels it could work. You'd either have to come up with an active buffer before the amps to replace the crossover or use DSP filters and feed it from a computer though.
The denon 688 doesn't do this, its either hdmi input optical/coax or R/L inputs.

If you really wanted to do this, you could buy / build a 4 channel amplifier and run the pre-out on the amp and do it that way.

NVM, it doesnt have pre-outs.

Click the image to open in full size.
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Old 29th November 2009, 01:08 AM   #5
Key is offline Key  United States
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Looks like it has discrete inputs to me. Under "Ext In"
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Old 29th November 2009, 01:09 AM   #6
jleaman is offline jleaman  Belgium
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Originally Posted by Key View Post
Looks like it has discrete inputs to me. Under "Ext In"
Don't think it will work that way, plus that's only one source, i bet he is running more than one source.
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Old 29th November 2009, 01:17 AM   #7
Key is offline Key  United States
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It's the place where you would need to feed the filtered audio. So the source number would be limited by the active buffer or soundcard. It would be limiting no doubt. But technically it will work the way I described. I am using a crappy 1970s Sansui quad receiver with discrete inputs and if that thing will do it his will probably work better haha. But if he wants them up and working the way they were before then yeah the easiest way would probably be to repair the passive xover.
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Old 29th November 2009, 01:23 AM   #8
jleaman is offline jleaman  Belgium
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Originally Posted by Key View Post
But if he wants them up and working the way they were before then yeah the easiest way would probably be to repair the passive xover.
That would be the simple and proper way to do this, and if there is not enough volume, he needs more efficient speakers for sure.!

Plus 7.1 in is not really 7.1 out, its 7.1 in then through a processor etc etc, then out. more work than what it's really worth.

J'
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Old 29th November 2009, 01:28 AM   #9
Key is offline Key  United States
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Yeah if it always has a decoder on then I wouldn't bother. But if it's got a discrete output aka "DVD-A Ready" or what in the seventies and sixties would be used to playback a quad reel or a CD4 decoder then it is a perfectly acceptable kludge to experiment with imo.
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Old 29th November 2009, 01:33 AM   #10
jleaman is offline jleaman  Belgium
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Originally Posted by Key View Post
Yeah if it always has a decoder on then I wouldn't bother. But if it's got a discrete output aka "DVD-A Ready" or what in the seventies and sixties would be used to playback a quad reel or a CD4 decoder then it is a perfectly acceptable kludge to experiment with imo.
yup,


IMO tho, Fix speaker - replace with better speakers ( would be cheaper too)
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