[[email protected]]

I've lurked quite a bit for a definitive answer to this question, but
have yet to find it.

Situation: I've got 12 separate office rooms with only one pair of
in-wall speaker wires going to each which means I have no choice but to
go mono. My idea is to line mix the left/right channels with the
result being two equal mono inputs into a stereo power amp. From there
to an impedance matched speaker selector, then through separate volume
controls in each room. My reasoning is to be able to use both channels
of the amplifier as equal mono outputs.

Am I on the right track or am I missing something? If I use a compact
line mixer with a single line out, can I split that for two equal mono
signals. Cost is a factor.

Possible Mixers: http://www.zzounds.com/item--RLLMX56C
http://www.zzounds.com/item--BEHMX400


Many Thanks, Brent

[Peter Larsen]

Am I on the right track or am I missing something? If I use
a compact line mixer with a single line out,

Waste of money, you need a junction box with a 1 kOhm resistor in series
with each channel prior to summing them.

Cost is a factor.

I prefer to build such contraptions in small plastic boxes to avoid hum
loop and grounding issues.

Many Thanks, Brent


Peter Larsen

[Walt]

wrote:


Situation: I've got 12 separate office rooms with only one pair of
in-wall speaker wires going to each which means I have no choice but to
go mono. My idea is to line mix the left/right channels with the
result being two equal mono inputs into a stereo power amp. From there
to an impedance matched speaker selector, then through separate volume
controls in each room. My reasoning is to be able to use both channels
of the amplifier as equal mono outputs.

Am I on the right track or am I missing something? If I use a compact
line mixer with a single line out, can I split that for two equal mono
signals. Cost is a factor.

Possible Mixers: http://www.zzounds.com/item--RLLMX56C
http://www.zzounds.com/item--BEHMX400


Yes, you're on the right track. You can split the output of the mixer
using a Y cable and drive both channels of the stereo amp. The $20
Behringer should be fine, and far cheaper than building a box yourself
if you value your time at more than minimum wage.

//Walt

[TimPerry]

wrote:
I've lurked quite a bit for a definitive answer to this question, but
have yet to find it.

Situation: I've got 12 separate office rooms with only one pair of
in-wall speaker wires going to each which means I have no choice but
to go mono.

look at installing a 70 volt system.


My idea is to line mix the left/right channels with the
result being two equal mono inputs into a stereo power amp. From
there to an impedance matched speaker selector, then through separate
volume controls in each room. My reasoning is to be able to use both
channels of the amplifier as equal mono outputs.

Am I on the right track or am I missing something? If I use a compact
line mixer with a single line out, can I split that for two equal mono
signals. Cost is a factor.

Possible Mixers: http://www.zzounds.com/item--RLLMX56C
http://www.zzounds.com/item--BEHMX400


Many Thanks, Brent

[[email protected]]

Thanks All for the quick responses. This will help me get started
on(or rather finish) this project.

Brent