| Author |
Topic: Tubefex and Transtubefex output levels |
Ken Fox
From:
Nashville GA USA
|
Posted 15 Oct 2002 3:09 pm |
|
Just some info I picked up over on the Peavey Forum:
"The outputs are low impedance, 470 ohms on the 1/4" and 100 ohms on the XLR's. You should have no problems driving a power amp with the 1/4" outputs. They have a nominal output of 1V RMS. The Direct Out XLR outputs have a nominal output of .316V and are used primarily to go into the mic input of a mixer. I hope this helps."
There has been some question about driving power amps with these units. They appear to be quite capable of driving most any power amp. |
|
|
|
Mike Brown
From:
Meridian, Mississippi USA
|
Posted 16 Oct 2002 5:11 am
|
|
| Yes, the XLR outs are intended to be routed to the input of a mixing console. An XLR out to an amp is not necessary since the Tubefex/Transtube Fex or Profex II is usually mounted into the same rack case as the power amp. Thanks for the info Ken. |
|
|
|
Paul Graupp
From:
Macon Ga USA
|
Posted 17 Oct 2002 11:51 am
|
|
Mike: If .316 is a nominal reading for XLR lines, would you read that between the two lines or from either line to ground ? Sometimes I need to check for proper out levels and I may need to know that. Thank You !!
Regards, Paul |
|
|
|
Ken Fox
From:
Nashville GA USA
|
Posted 17 Oct 2002 7:14 pm
|
|
| That should be pin 3 (hot) and pin 2 (common) of a balanced XLR output jack. Pin 1 is ground, not referenced to a signal voltage. |
|
|
|
Paul Graupp
From:
Macon Ga USA
|
Posted 18 Oct 2002 4:59 pm
|
|
Ken: I'm sorry ! I confused it with studio wiring where the output is from a center tapped transformer secondary with that center being grounded. The opposite end was the reverse of that as an input primary and also with a center tap on ground. I just assumed these XLRs were the same configuration: Sorry !
Regards, Paul |
|
|
|
Ken Fox
From:
Nashville GA USA
|
Posted 18 Oct 2002 5:33 pm
|
|
| Paul, I am pretty sure its not a transformer balanced output. Most stuff now a days is differential op-amp balanced! Op amps are cheaper than transformers. Even at that, pins 2 and 3 are the signal carriers on XLR. Only exception is the Japanese standard is pin 2 hot (that was about 15 years ago, could have changed!). I must admit, I have not kept up with pro audio like I did 15 years ago! |
|
|
|
