Stereofying a Peavey XR684 mixer amp ?

N

N_Cook

Guest
So called stereo mixer amp , 2 outputs, 2x200W as main and monitor but no
PAN pots.
While in there for a lot of minor problems, any relatively simple way to
stereofy.
Break the main bus line in two and feed sepatately into the PAs and have a
basic (1 to4 ch to left and 5 to 8 ch to right ,with one or more feed/s
parallel split into 2 ,say to ch1 and vh5 etc ) stereo output and add a sw
somewhere to select Mono or Stereo options ?
 
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:k7tqc8$qca$1@dont-email.me...
So called stereo mixer amp , 2 outputs, 2x200W as main and monitor but no
PAN pots.
While in there for a lot of minor problems, any relatively simple way to
stereofy.
Break the main bus line in two and feed sepatately into the PAs and have a
basic (1 to4 ch to left and 5 to 8 ch to right ,with one or more feed/s
parallel split into 2 ,say to ch1 and vh5 etc ) stereo output and add a sw
somewhere to select Mono or Stereo options ?
Click to expand...


You'd be better off just using a cheap external stereo mixer to mix your
stereo sources, and plugging its outputs into the 2 x phono stereo input on
channel 9, and keep your 8 mono channels instead of reducing them to 4.
Or at least your customer would, as they wouldn't have to twiddle 2
different sets of EQ, Volume and FX send knobs every time they wanted to
change anything.



Gareth.
 
Gareth Magennis <sound.service@btconnect.com> wrote in message
news:KoKdneVJ2ptX6j_NnZ2dnUVZ8i2dnZ2d@bt.com...
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:k7tqc8$qca$1@dont-email.me...
So called stereo mixer amp , 2 outputs, 2x200W as main and monitor but
no
PAN pots.
While in there for a lot of minor problems, any relatively simple way to
stereofy.
Break the main bus line in two and feed sepatately into the PAs and have
a
basic (1 to4 ch to left and 5 to 8 ch to right ,with one or more feed/s
parallel split into 2 ,say to ch1 and vh5 etc ) stereo output and add a
sw
somewhere to select Mono or Stereo options ?





You'd be better off just using a cheap external stereo mixer to mix your
stereo sources, and plugging its outputs into the 2 x phono stereo input
on
channel 9, and keep your 8 mono channels instead of reducing them to 4.
Or at least your customer would, as they wouldn't have to twiddle 2
different sets of EQ, Volume and FX send knobs every time they wanted to
change anything.



Gareth.
Click to expand...
The amp is in bits at the moment but according to the owner the 2x phono
pairs allow using a standard stereo phono lead connection but the signals
are summed and fed to the single bus to the single input of the PA amps, ie
mono out .
 
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:k7u0rl$1fp$1@dont-email.me...
Gareth Magennis <sound.service@btconnect.com> wrote in message
news:KoKdneVJ2ptX6j_NnZ2dnUVZ8i2dnZ2d@bt.com...

"N_Cook" <diverse@tcp.co.uk> wrote in message
news:k7tqc8$qca$1@dont-email.me...
So called stereo mixer amp , 2 outputs, 2x200W as main and monitor but
no
PAN pots.
While in there for a lot of minor problems, any relatively simple way
to
stereofy.
Break the main bus line in two and feed sepatately into the PAs and
have
a
basic (1 to4 ch to left and 5 to 8 ch to right ,with one or more feed/s
parallel split into 2 ,say to ch1 and vh5 etc ) stereo output and add a
sw
somewhere to select Mono or Stereo options ?





You'd be better off just using a cheap external stereo mixer to mix your
stereo sources, and plugging its outputs into the 2 x phono stereo input
on
channel 9, and keep your 8 mono channels instead of reducing them to 4.
Or at least your customer would, as they wouldn't have to twiddle 2
different sets of EQ, Volume and FX send knobs every time they wanted to
change anything.



Gareth.



The amp is in bits at the moment but according to the owner the 2x phono
pairs allow using a standard stereo phono lead connection but the signals
are summed and fed to the single bus to the single input of the PA amps,
ie
mono out .
Click to expand...
According to the manual
http://www.peavey.com/assets/literature/manuals/80304400.pdf
channels 7,8, and 9 are all stereo and ARE routed left and right, if
left/right mode is selected.

The onboard effects are also stereo and go to left and right.



Gareth.
 
The amp is in bits at the moment but according to the owner the 2x phono
pairs allow using a standard stereo phono lead connection but the signals
are summed and fed to the single bus to the single input of the PA amps,
ie
mono out .
Click to expand...


The obvious way of telling if its stereo or actually summed mono is if the
volume (and EQ) pots are single ganged or dual ganged.


Gareth.
 
Gareth Magennis <sound.service@btconnect.com> wrote in message
news:ESvos.201260$nB6.152042@fx21.am4...
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:k7u0rl$1fp$1@dont-email.me...
Gareth Magennis <sound.service@btconnect.com> wrote in message
news:KoKdneVJ2ptX6j_NnZ2dnUVZ8i2dnZ2d@bt.com...

"N_Cook" <diverse@tcp.co.uk> wrote in message
news:k7tqc8$qca$1@dont-email.me...
So called stereo mixer amp , 2 outputs, 2x200W as main and monitor
but
no
PAN pots.
While in there for a lot of minor problems, any relatively simple way
to
stereofy.
Break the main bus line in two and feed sepatately into the PAs and
have
a
basic (1 to4 ch to left and 5 to 8 ch to right ,with one or more
feed/s
parallel split into 2 ,say to ch1 and vh5 etc ) stereo output and add
a
sw
somewhere to select Mono or Stereo options ?





You'd be better off just using a cheap external stereo mixer to mix
your
stereo sources, and plugging its outputs into the 2 x phono stereo
input
on
channel 9, and keep your 8 mono channels instead of reducing them to 4.
Or at least your customer would, as they wouldn't have to twiddle 2
different sets of EQ, Volume and FX send knobs every time they wanted
to
change anything.



Gareth.



The amp is in bits at the moment but according to the owner the 2x phono
pairs allow using a standard stereo phono lead connection but the
signals
are summed and fed to the single bus to the single input of the PA amps,
ie
mono out .




According to the manual
http://www.peavey.com/assets/literature/manuals/80304400.pdf
channels 7,8, and 9 are all stereo and ARE routed left and right, if
left/right mode is selected.

The onboard effects are also stereo and go to left and right.



Gareth.
Click to expand...
I'd only seen the repair manual and was going by what the owner told me
 
ch5 and ch6 are down in level. Shared by SMD U500 dual op-amp and DC in
that area ,different to the other channels , so changed it, and the same
lack of throughput and same DC. Must be something else further upstream
loading that area
Will remove a 000 ohm to isolate to confirm first . I did not fully check
ch7,8,9 initially as different structures but I think they were low as well
, so something further upstream , requiring full dismantling as the boards
overlap, c'est la vie
 
looks as though I'm leading myself up the garden path. ch5 and 6 of this
unsuffixed xr684 are not as in the F suffixed version schemas that is out
there and must have more gain farther upstream , in comparison to ch1 to 4
 
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