Phoenix Audio DRS-1R - Mono Class A Microphone Pre-Amplifier/DI in API 500 Series - Manual (Page 6)

The only place you might get clipping on the DRS-1R is in the INPUT stage
(although the headroom on the INPUT stage is very high!)........
So if you believe the DRS-1R IS clipping, just turn the INPUT down,
but the OUTPUT can be turned up to maximum if you wanted.
The DRS-1R is capable of handling a huge input range, from -70dB right
up to 0dB, and STILL have 10dB of headroom. The output stage can
easily deliver +26dB!!! Please don't automatically believe the DRS-1R is
clipping!
For DI input:
Simply insert the input signal into the DI jack, and turn up the level using
the Output knob only, (remember, the Mic-sensitivity switch is not operable
in the DI mode).
If the first (bottom) Green LED is Just lit, then the unit will be sending a level
of -2dB to the output XLR the green LEDs go up to +10dbu, and if the Yellow
LED is lit, then it is sending +13dB to the output XLR, and finally the Red LED
is set at +16dbu. This is NOT the maximum levels the unit will output, but is
purely and indication" of level. If you want a much "Hotter" output, then simply
turn up the output level knob to whatever you need. You can turn the output
level knob to almost maximum without any fear of distortion in the output
stage (This still leaves +10dB of headroom, above the RED led level.
INPUT and OUTPUT connections:
The DRS1R is fitted with an XLR input and output on both the rear panel
of your API rack or API approved rack.
If the +48V phantom power is button is engaged it will apply +48V to the
XLR input on the rack.
The DI input is a standard 1/4" (6.35mm) mono jack socket
(wired Standard – Tip-hot, Sleeve-Ground).
It will also accept a 1/4” stereo jack.