Re: [Harp-L] Line Out question (one more)

[MARK BURNESS <markwjburness@xxxxxxxxxxxxxx>]

Hi Andi,

Speaker driven line outs are typically lo impedance, expecting to see a hi 
impedance unbalanced input, I'm guessing nearly every sound man would have done 
what your guy did. The problem may be that, in recent years,  many PAs have done 
away with hi impedance jack inputs & replaced them with lo impedance TRS jacks.

In many cases what he did will work fine, it is well proven technology. As in 
your case, it didn't, then, yes a DI box may have cured the issue. It's best to 
have one on hand.

Is the "line out" on the solid state amp a real "line out", or a "preamp out"? A 
speaker driven "line out" usually generates around a volt of AC (lo voltage, lo 
impedance), a "preamp out" is designed to drive an output section/power amp and 
can be high voltage, hi impedance...which might explain the difference you are 
hearing?

If you have doubts and you have a AC RMS voltmeter, you could play through the 
amp, connect the line out to the voltmeter, via a guitar cord, & read the 
voltage developed...as I said, I would expect to see around a volt AC RMS (or 
maybe 3VAC peak to peak) average.

Micing with an SM57 is also a well proven alternative.

Regards, Mark.


 



________________________________
From: "ANDIMARTIN@xxxxxxxxxxxxxx" <ANDIMARTIN@xxxxxxxxxxxxxx>
To: harp-l@xxxxxxxxxx
Sent: Tuesday, 19 October, 2010 14:10:07
Subject: [Harp-L] Line Out question (one more)

First time using the Line Out of my Super Sonny to go into PA instead of micing 
the amp. The PA guy put it straight in to the mixer using a guitar cable without 
using a DI Box (no more left fore me). He told me that the signal he was 
receiving was a low level signal and at the end, after trying different things, 
my signal could not be amplified throuhg the PA...

Why? 
Was he doing something wrong?
Is my line out high or low impedance unbalanced signal?
May I use a DI Box?

At home I've connected the line out of the Super Sonny to the input of a solid 
state fender amp and I also "feel" the signal level is low if compared when I do 
it the other way, connecting the line out signal from the solid state amp to the 
SS. The signal then is much stronger... ???

Which do you think is the best approach to go from the Line Out jack into PA?

Thanks in adnvance for your help!!
Andi.

www.myspace.com/andimartinbluesharp