RTFM - I wish I had!!
« on: July 15, 2008, 07:34:14 PM »
Well - what a knob-head!
Been scratching my head for a good few hours wondering where all the bass has gone from the inputs of DOAC.
For years I've used a mackie 1604VLZ with BALANCED AUX sends with pretty low output Z.
On my test bench I got a little 1202 - yes 1202 NOT VLZ.
Yes I assumed the Aux sends are balanced and low output Z - WRONG - a quick flip to the balanced low Z main outs gave my bass back :roll:
Ah well - too tired to finish tidying it up tonight :mad: but now I know the problem :grin: pics of finished DAOC soon but couple of  :sam: tonight :wink:
making better music!


RTFM - I wish I had!!
« Reply #1 on: July 16, 2008, 07:28:50 AM »

Bass back = bass back, but while the sends of the 'original' (the MS1202) are indeed unbalanced they're still what I'd call low-Z-ish: R_source is 300 Ohms.


There you can see that the main-outs are indeed balanced but have double that 300: total R_source is 600!

What's your load, 600 ?


RTFM - I wish I had!!
« Reply #2 on: July 16, 2008, 09:17:30 AM »
I'll double check my wiring - can't see how its making a circuit - i'm sure the jack ring has no contact in the aux send. With a 10k/10k edcor bass rolled off below 200hz-ish - with sowter 3575 about 300hz. Tried a 600/600 oep and it was bye-bye signal. It seems to behave like an ariel!!
transformer input wired directly across xlr pin 2&3 to jack tip and ring.

remove tx from input and joined wires - aux output is then referenced to 0v by secondary being directly connected to ground - full bass

Just happy to have sorted it :thumb:
making better music!


Related Topics

  Subject / Started by Replies Last post
243 Replies
Last post July 20, 2006, 05:53:33 PM
by Svart
9 Replies
Last post September 03, 2005, 06:26:16 PM
by amorris3
0 Replies
Last post January 31, 2008, 11:46:43 AM
by bram
44 Replies
Last post November 20, 2009, 02:07:41 PM
by danjpiscina