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Rockville PPA20 Rack Mount Pre-Amplifier
1U Rack Size
1/4" microphone input
RCA PHONO / AUX1 / AUX2 / AUX3 / AUX4 / AUX5 inputs
1/4" headphone output
RCA REC / LINE outputs
XLR master output ( left, right )
Headphone volume & Microphone volume controls
3 band EQ (Treble / Mid / Bass)
Master volume
L / R balance
Input source switch
Mono / Stereo switch
Mute
Low cut crossover control allows you to cut off certain frequencies which comes in handy when using turntables, subs, and other gear. This function will allow you to play your music louder, with lower distortion and make your speakers last longer
Treble / Bass control
Loudness compensation circuit which at low-to-medium volume boosts the bass and treble response
Tape Monitor
Ground lift switch
Unit dimensions: 18.89" x 6.49" x 1.73" inches
Unit weight: 4.43 lbs
Shipping dimensions: 20.47" x 8.46" x 4.33" inches
Shipping weight: 5.73 lbs
110/220 switchable power supply (fuse: 0.2A)
Inputs Sensitivity/Impedance
Mic: 1mV / 3 Kohms
Phono: 3mV / 47 Kohms
Tape, Tuner, CD, Aux: 150mV / 22 Kohms
Output/Impedance
Tape Rec: 150mV / 3 Kohms
Pre Output: max. 11V / 1 Kohms
Total Harmonic Distortation
Mic: less than 0.02%
Phono: less than 0.04%
Tape, Tuner, CD, Aux: less than 0.01%
Signal To Noise Ration
Mic: more than 70 dB
Phono: more than 90 dB
Tape, Tuner, CD, Aux: more than 100 dB
Frequency Response: 5Hz . 30kHz +0, -3 dB
Bass: 12dB at 100Hz
Midrange: 9dB at 1 Hz
Treble: 12dB at 10kHz
Loudness: 9/0/+9dB at 100/1k/10kHz
Mute: 20dB
Power: 120V or 230V, 50/60Hz
Power Consumption: 15W
George Aubrey
July 5, 2025
Simple to use and, sounds great. With my Phase Linear 700A power amp and 4 Bose 501's speakers from 1977.
Kamin
June 10, 2025
I have a Carvin 1500 watt amp and always wanted to use it as a home stereo (not theater....just for stereo music) amplifier...the Carvin has a 1/4inch ins and XLR inputs which are balanced. I wanted a preamp to have XLR output to use the very nice XLR input on the amp...which makes a huge difference in sound quality and noise cancellation when using XLR (balanced cable) and you can push the amp higher with cleaner sound, I did read some reviews about noise and some non functioning dials on this preamp...but for the price I decided to take a chance and I am glad I did. The sound quality blows away my Integrated amp (100 watts per channel) - and good luck finding a preamp for this price full stop! I did find one preamp with XLR outputs for a mere $4500!! Decided I was going to take my chances with this one! Also as a side note the equalizer function is clean and accurate, AND the loudness button really works well. One last caveat was that I can use the MICROPHONE input to plug in my guitar directly and play along with the music for learning a song or just jamming along....I am assuming you can actually use this as a sing along Karaoke machine to your favorite music is you are vocally talented (I have been banned to even sing in the shower which I think is rather cruel! so no...I dont have a microphone!) - anyhow....if you need a preamp, this is a good one...it has RCA in and out...AND you can plug your own equalizer to it if you want before sending out to the amplifier....I am assuming that would allow you to equalize on both the pre amp AND the equalizer for major sound modification. The only thing I wish the pre amp had would be a lighted face, but I am sure that would send the price up significantly....Hope this was helpful
Dave greger
May 10, 2025
Have used this in my garage with a pair of powered PA speakers and its been 18+months of flawless operation until last month. I took it to use at a birthday party I was providing music for (Not mixing or DJ'ing) and as soon as I turned it on there was a noticeable hum in the speakers. When I would touch the box anywhere the hum got 10 times louder. I changed out power strips, outlets etc. still there. Checked it again when I got home and same noise. This is/was a great box for its purpose but it really needs a quality Internal power supply and a grounded 120VAC input.
Nick
April 29, 2025
I own 2 of these preamps. My first one was the 3-wire AC corded version with an internal power supply. It did NOT have an external ground lift switch as advertised. In order to eliminate the variable 120 Hz hum, I had to make the following internal AC circuit modifications. I removed the Green wire ground connection, placed a decoupling capacitor across the Hot and Neutral and wired a 2.2 Meg Ohm resister from Neutral to chassis ground. I also added a grounding lug for my TT. This helped a LOT, but did not completely eliminate all the hum. AVOID this one if you can. The latest version has no internal power supply and relies on a 12VDC 1 Amp external wall-wart. THIS IS THE ONE YOU WANT TO BUY! I did NOT have to make any modifications at all. It's very quite and has no scratchy balance POT like the AC corded version. Contrary to what some have said, BOTH units have a fully functional RIAA Moving Magnet Phono input. They are comparable to the Pyle or Behringer MM phono preamps in sound quality, which is good enough for most listeners. I don't see how they can manufacture this product at such a low price? I'm gladly keeping both.
Spaceshanty
February 17, 2025
I’ve had this for about a week and it fit my needs. I was looking for basically a source selector to fit in the open spot in my audio rack that is primary dedicated to playing 78s but also handles other inputs (video, CD and iPhone.) I removed the feet from the PPA20 so it would fit in the rack and got a chance to look at the build of the unit. To my amateur but nerdy eye, the PPA20 looked nicely made. I have not tried out it’s full functionality and don’t use the “phono” position for my TTS, but the clean sound, basic features and price were a good hit for me. I don’t think it is exactly mentioned in the description, but this can handle 5 RCA inputs plus a phone stage that I haven’t tried since I prefer using different preamps.
Lolly
January 6, 2025
Beware of this and any other unit that my be based on it. 1. Overall sound is muffled, even with treble at max. 2. Inputs easily overload and distort. 3. Not a true phono input, just another line level input, no proper boost for phono nor RIAA curve. You will also need a phono preamp. 4. My headphone jack was DOA from the start and never worked.
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