On 05/09/2010 21:43, Andre Jute wrote:
Time to return to tech-talk.

In a modest-sized room (by horn standards anyway) I want to rig up a
singleton of my modded semi-Fidelio bicor horns for Lowther PM6A. I
thought I'd do the monoing in a specially made 1 metre cable between
the CD player and the power amp.

The QUAD CD expects to see at least 10K impedance on its outputs.
Output of the CD player is 2Vrms and about 0.5Vrms of that is required
to drive the amp to enough power to handle the horns, so high value
resistors can be used in the monomaker if there is any advantage to be
gained.

However, the sound is NOT intended to be reprocessed as stereo
downstream (home installation, not studio); if I want stereo again,
i'll just plug in a stereo cable.

The pot on the integrated amp is probably (the board won't be here
until Tuesday and i can't read the spec on the piccie) 50K Alps but I
can replace it with a DACT of which I have a good selection of values.

So what value resistors would you use for monoing?

How many? Only two, or three?

Is this a trick question? Surely the real McCoy would know the answer.
Whatever resistors are to hand in the junk box, or a couple of 12k and a
2k2 resistor.
But I would throw in an extra resistor and a capacitor to give some bass
boost.
The values would depend on the in-room LF response of the speakers.

--
Eiron.

Eiron wrote:

Is this a trick question? Surely the real McCoy would know the answer.

That thought crossed my mind too ! :-)

Graham

On Sep 6, 5:10*am, Eeyore
m wrote:
Eiron wrote:

Is this a trick question? Surely the real McCoy would know the answer.

That thought crossed my mind too ! *:-)

Graham

I come back after years away, and it is still the same unpleasant
mutual masturbation society with the same inadequates stroking each
other. Dunno why I bother. -- AJ

On 06/09/2010 05:16, Andre Jute wrote:
On Sep 6, 5:10 am, Eeyore
m wrote:
Eiron wrote:

Is this a trick question? Surely the real McCoy would know the answer.

That thought crossed my mind too ! :-)

Graham

I come back after years away, and it is still the same unpleasant
mutual masturbation society with the same inadequates stroking each
other. Dunno why I bother. -- AJ

You got an answer so I don't know what you're complaining about.
Why didn't you pose the dumb question as one of your puppets
as you used to do so you could join the thread later and pretend
you knew the answer all along?

I had a similar problem connecting a DVD player to a stereo amp,
trying to mix the centre channel into L and R as it doesn't have
an option to output plain stereo from a 5.1 source.
Two 10k and a couple of 20k resistors did the job.

--
Eiron.

"Eiron" wrote

I had a similar problem connecting a DVD player to a stereo amp,
trying to mix the centre channel into L and R as it doesn't have
an option to output plain stereo from a 5.1 source.
Two 10k and a couple of 20k resistors did the job.


That's odd. I've never met a DVD player that would not provide a 2-channel
mix-down from a 5.1 source if set up to do so. Indeed many low-cost DVD
players only have 2 audio output sockets, so 2-channel mixed-down audio is
the only option unless you connect the digital output to an external DD/DTS
decoder.

Or was it that you wanted discrete surround channels and it was only the
centre speaker that you didn't have?

David.