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Old 15th May 2005, 12:24 AM   #1
mcelaj is offline mcelaj  United States
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Default Stereo to mono...

I tried hooking up the two outputs out of my gainclone into one speaker and it would distort (clip I guess). Is there a way to do this without causing the distortion, perhaps attenuate the signal? Perhaps the signals should be combined before it gets to the amplifier, or pre-amp (phono stage), which would entail putting together a monoblock, which I don't mind undertaking. Any help on a stereo to mono conversion would be most appreciatred.
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Old 15th May 2005, 01:28 AM   #2
anatech is offline anatech  Canada
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Hi mcelaj,
You must be very careful about hooking amplifier outputs together. Normally this can not be done. When it can, the amp is either bridged or it's a tube amp and it may be in parallel. There is normally a switch to allow for this.

You almost let the magic smoke out of the box, and you wouldn't be the first to do this, this way.

-Chris
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Old 15th May 2005, 12:51 PM   #3
rabbitz is offline rabbitz  Australia
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You have to do the mixing at line level prior to the power amp or bang and smoke.

Have a look here for a simple circuit using 2 resistors which I used on one amp with a switch to use stereo or mixed mono. Very handy also for sub inputs from line or speaker level but the speaker level has to be attenuated first with a voltage divider.

http://www.tkk.fi/Misc/Electronics/c...s/linesum.html

I'll add the speaker attenuation circuit as well.

http://www.tkk.fi/Misc/Electronics/c...r_to_line.html
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Old 15th May 2005, 06:10 PM   #4
mcelaj is offline mcelaj  United States
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Fortunately I didn't get the puff of smoke as I tried it from my gainclone into a Decware Radial speaker. Would have been a shame to lose them. Thanks for the response guys.
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Old 16th May 2005, 06:00 PM   #5
amt is offline amt  United States
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So Rabbitz,

Are both these circuits essentially what are used in a sub plate amps?
Ive been thinking of building a sub amp, using an inexpensive car audio electronic xo. Would adding both circuits, allow for either speaker level signal use or line level, such as found on most all powered subs?

thx amt
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Old 16th May 2005, 10:44 PM   #6
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does your circuit look something like the PA-100 in this app note? http://www.national.com/an/AN/AN-1192.pdf - the point when it comes top paralleling chip amps is to use a series reistance between the chip outputs. If the DC offset of each is significantly different you may want to consider a servo like that shown in the BPA200 circuit in the same note.
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Old 17th May 2005, 12:09 AM   #7
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Use 2 speakers! One amp per speaker - works for me. Or antiphase one for bridge if the speaker Z is high enough.
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Old 17th May 2005, 01:15 AM   #8
anatech is offline anatech  Canada
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Right on amplifierguru. That's the best way since you now have lower voice coil temps. Efficiency goes up. Amps stay cooler and excursion may be lower.

-Chris
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Old 17th May 2005, 01:30 PM   #9
rabbitz is offline rabbitz  Australia
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Quote:
Originally posted by amt
So Rabbitz,

Are both these circuits essentially what are used in a sub plate amps?
Ive been thinking of building a sub amp, using an inexpensive car audio electronic xo. Would adding both circuits, allow for either speaker level signal use or line level, such as found on most all powered subs?

thx amt
Basically it is all they use. Built a P101 sub amp with a sub processor which has an attenuation circuit and then a mixer. I've got it set up so I can use line or speaker level with a switch selecting either.

Stereo Speaker level> attenuation > mixer to mono> processor
or when switched
Stereo Line level> mixer to mono> processor (chosen by a jumper)
LFE> processor (chosen by a jumper)
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Old 17th May 2005, 03:45 PM   #10
amt is offline amt  United States
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Excellent! I just so happen to have two P101 boards here and just waiting for Mosfets to arrive.
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