Hey Bob,

Here's something to consider:
http://www.adesignsaudio.com/atty.html

Since I own an A-Designs Pacifica, and the designer Peter Montessi is practically a neighbor, he gave me a couple of ATTYs to try.
One of the uses was as a passive line attenuator after the Pacifica, and it works pretty well.

These run under $80 street.

Both Hosa and Shure make them as well.

Bob, I can say this just doesn't add up.

I've used my own API 312/3124, for over 25 years. They produce a standard output of + 4 from the rear XLR outputs and a slightly lower level from the 1/4" outputs which are also balanced. You don't need any in-line pad for these.

If you think the level is too hot? Turn down the trim. Or take the 1/4" outputs if you're going into a -10 low line level input. Really.

On the 3124m, the left & right outputs, from the mixer section, are not only unbalanced but there level adjust is actually a potentiometer slung directly on the output. So it is actually a stereo output adjustable pad. That's just for the stereo output from the internal mixer. Not the same from the direct preamp outputs.

So don't bother with in-line pads unless the name is Stay-Free?
Ms. Remy Ann David

20 channels of 312
Ms. Remy Ann David

Well, I was a little surprised to read the comments that said it had an unusually hot signal. I think the issue is that Boswell feels the 3124+ sounds best running hot. Of course, I'll see what it's like when the unit comes in, and I wasn't planning to plunk down for the pads unless I felt there was a problem. Figured it was a useful thing to know regardless. At any rate, it may be moot. I finally plunked down for a D25 breakout cable so I can use the line inputs on my OctoPre, and on the line inputs the level control goes from -10 to +10 dB, so I should have at least a little pad there if necessary.

A switchable line attenuator can be a useful thing.
once you have worked out what attenuation you want
make one
DIY
:)

http://www.uneeda-audio.com/pads/
this one has a table for Microphones
passive pads can be influenced by the load
so don't just go by what the label says
- double check the results then buy the parts

Bob, you are quite correct in remembering that I mentioned using in-line attenuators on the API 3124+ outputs, which can go to +32dBu. BUT, it depends on what I am recording and what the API is driving. I use them only when I am recording jazz/folk/rock material (not classical) and I am driving my HD24XRs, which have a clip level of only +19dBu. For other use, I don't attenuate.

With your Octopre, you shouldn't need external attenuators if you set the line in gain to -10dB, as that gives you +30dBu input levels before the limiter kicks in (if enabled) or +32dBu before the overload LED lights.