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#145306 - 08/13/06 11:47 AM Multiple speaker lines into 1 speaker?
JimBass Offline
regular

Registered: 08/13/06
Posts: 8
Hi, I'm a Axiom owner for a couple years ...
VP100
QS8
M40 (whatta sale!)
M3Ti

Anyway, I'm going to do some wiring in my house and I wanted to put a couples lines from 2 different amps into my M40's. Both lines should never be active at the same time ... but I want to know in case of the inevitable accident when 2 amps (denon, yamaho) are powering my M40's, will that be a problem?

TIA!

Jim

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#145307 - 08/13/06 12:47 PM Re: Multiple speaker lines into 1 speaker? [Re: JimBass]
bridgman Offline
axiomite

Registered: 08/25/04
Posts: 5416
Loc: Bowmanville, Ontario, Canada
I wouldn't do this even if you were sure that both amps would never be active at the same time. It seems pretty likely that the powered-off amp would present enough of a load that it would impact the sound.

Can you switch at line level instead, eg. run a line level cable from the pre-out (or something) of one amp to an aux in on the other amp and always use the same amp to drive the 40s ?

Alternatively, get a cheap switching box.

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#145308 - 08/13/06 01:10 PM Re: Multiple speaker lines into 1 speaker? [Re: bridgman]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 17782
Loc: NoVA
We've kind of danced around this before, and I think the conclusion was that it's likely to damage one or both of the amplifiers.
_________________________
I am the Doctor, and THIS... is my SPOON!

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#145309 - 08/13/06 02:16 PM Re: Multiple speaker lines into 1 speaker? [Re: JimBass]
F107plus5 Offline
connoisseur

Registered: 01/24/05
Posts: 2034
Loc: Fla. Orig. Mich.
I have nothing to add...except:

Welcome to the forum, and; Bless you, for having M40s.
Rich.

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#145310 - 08/13/06 02:17 PM Re: Multiple speaker lines into 1 speaker? [Re: Ken.C]
bridgman Offline
axiomite

Registered: 08/25/04
Posts: 5416
Loc: Bowmanville, Ontario, Canada
For clarity, do you agree we concluded that connecting the outputs of two amplifiers to one set of speakers might damage one or both amplifiers, not the line-level solution I proposed ?

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#145311 - 08/13/06 02:19 PM Re: Multiple speaker lines into 1 speaker? [Re: F107plus5]
bridgman Offline
axiomite

Registered: 08/25/04
Posts: 5416
Loc: Bowmanville, Ontario, Canada
>>Welcome to the forum, and; Bless you, for having M40s

Hey, I own M40s and *I* never got blessed


Edited by bridgman (08/13/06 02:22 PM)

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#145312 - 08/13/06 02:47 PM Re: Multiple speaker lines into 1 speaker? [Re: F107plus5]
St_PatGuy Offline
axiomite

Registered: 03/07/05
Posts: 7405
Loc: Glendale, Arizona
M40s!!!

Rich, I want my blessing too!
_________________________
***********
"Nothin' up my sleeve. . ." --Bullwinkle J. Moose

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#145313 - 08/13/06 03:17 PM Re: Multiple speaker lines into 1 speaker? [Re: bridgman]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 17782
Loc: NoVA
Yeah, I was referring to his solution, not yours.
_________________________
I am the Doctor, and THIS... is my SPOON!

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#145314 - 08/13/06 03:32 PM Re: Multiple speaker lines into 1 speaker? [Re: Ken.C]
F107plus5 Offline
connoisseur

Registered: 01/24/05
Posts: 2034
Loc: Fla. Orig. Mich.
Sorry for the delay....I couldn't find my vestiments.

Ok; ready?

"A blessing to all Y'all who have M40s and M50s.....shucks; and even M3s" From (Grand)Father Rich.

Now go and sin no more by listening to.......nah; M2s, M22s, M60s and M80s are no longer evil, you have my audio absolution for all past transgressions!

Rich.

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#145315 - 08/13/06 04:36 PM Re: Multiple speaker lines into 1 speaker? [Re: F107plus5]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 17782
Loc: NoVA
Is it ok if I have a non-Axiom sub?
_________________________
I am the Doctor, and THIS... is my SPOON!

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#145316 - 08/13/06 05:35 PM Re: Multiple speaker lines into 1 speaker? [Re: Ken.C]
JimBass Offline
regular

Registered: 08/13/06
Posts: 8
Thanks for the replies. I love my 40's ... loved my 3ti's as well but the 40's plus my HSU sub and it's heaven. I'm still amazed sometimes when I sit and listen to some great sources. Bliss.

I'm also thinking of doing this:

Think Geek Wireless T-Amp

I'm not as concerned with the perfection of the sound sound since it'll be mostly ambient music in this setting (pandora.com coupled with slimbox).

Thanks for the warnings on the speaker wiring. I'm kicking around different ways of doing things and that popped into my head. But I also can run line-level into the receiver into that room and amp it instead. HOwever, I am leaning towards the wireless solution on thinkgeek.

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#145317 - 08/14/06 10:40 PM Re: Multiple speaker lines into 1 speaker? [Re: JimBass]
ratpack Offline
connoisseur

Registered: 04/30/05
Posts: 1155
Loc: Alabama
The bottom line is how are the two amplifiers protected??? It could be that there would be no problem and, on the other hand, you could have smoke. In any case, the unused amp would provide a parallel load for the operational amp.

My bottom line is that I would NOT do what you are suggesting. I just don't think that the risk of an accident is worth it.

Just one man's opinion.
_________________________
The Rat. M80s, VP-150, QS8s, SVS PC 20-39+, OPPO, Onkyo 703s, Harmony 880 Sony 60" SXRD HDTV

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#145318 - 08/14/06 11:00 PM Re: Multiple speaker lines into 1 speaker? [Re: ratpack]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13337
Loc: Iowa
And a second man's opinion.
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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#145319 - 08/15/06 12:11 AM Re: Multiple speaker lines into 1 speaker? [Re: JimBass]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10395
Jim, welcome. Reinforcing the previous replies, note that it doesn't matter if both amplifiers are "active" simultaneously. The connection is equivalent to a "Y" from the active amplifier, driving into both the speaker and the other amplifier(even if it's off), damaging the inactive amplifier. A switching device to completely isolate the two amplifiers would be necessary.
_________________________
-----------------------------------

Enjoy the music, not the equipment.



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#145320 - 08/15/06 12:34 PM Re: Multiple speaker lines into 1 speaker? [Re: JohnK]
chrono Offline
old hand

Registered: 06/24/03
Posts: 89
Loc: Toronto, ON
I was in the same situation as you. If both of your amps are solid state, and not tube, then I think the solution is getting a speaker selector. Most of them I believe can work backwards as a source selector for one pair of speakers. Check out this post for a previous discussion on it here

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