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Pioneer RG-2

Stereo Dynamic Processor (1980-82)

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Pioneer RG-2


The Pioneer RG-2 is an audio processor with 5 stage dynamic expansion selector.

Modern recording uses three dynamic control techniques which may detract from the original dynamic range; reduction of transient peaks, overall compression of loud levels and upward manipulation of soft levels.

The RG-2 will correct dynamic distortion in each of these areas, increasing the contrast and virtually restoring the original live program.


Maximum output voltage: 6.5V

Total harmonic distortion: 0.05%

Dynamic expansion: 4, 7, 10, 13, 16dB

Signal to noise ratio: 100dB (1V), 116dB (6.5V)

Semiconductors: 4 x IC, 29 x transistors, 30 x diodes

Dimensions: 420 x 99 x 336mm

Weight: 4.4kg


instruction/owners manual   English -

schematics   English -

service manual   English -

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Reviewed Jan 17th, 2016 by RTM

I have several of these lovely units and I use them exclusively with my FM Tuners. They do a fine job of imparting a sense of dynamics back to stations that have not been particularly sensitive to having everything shoved upwards to all loud, all the time compression. There ARE occasional noise artifacts that will expose themselves but for me they are only encountered at the 16dB expansion level and then only with certain analog transient sensitive formats like LP. I don't usually use it with tape, but it might work with that as well. It's best feature is its bypass feature, because there are any number of high quality sources that do not need to have their Dynamics/transients lilies gilded. Knowing when to say when is part of learning how to get the best out of it. Sometimes the 7dB or 13dB setting is what suits the source best. If you're noticing it contributing something of its own sound to the presentation, it's probably set a bit too hot. But, again, it is and always will be a matter of personal preference. Very highly recommended.

Reviewed Mar 28th, 2013 by oldestpunkinargentina

I picked this wonderful device in mint condition circa 1995 to match my equally mint Pioneer SX-980 and PL-3000 turntable. I also had a spanking-new Pioneer GR-777 equalizer and a Technics SL-PG 440 cd player, all of which are still going strong to this day and constitute the core of my audio system.

At this point I can almost read your mind; why on earth did this moron want this contraption for ? Only to ¨match¨ his silverline Pioneer receiver and turntable ? Nah. I had always wanted a DBX expander but could never afford them back in the day, and this gizmo performed basically the same function only without the 3-band hassle and complexity. Paid U$ 250 for it, and it proved worth every cent. Plus, it is so beautifully-looking and sturdily-built I look at it every day of my life and pat myself in the back for the purchase; man was I lucky to find it. It had NEVER ever been used by the owner because he did not know what the heck it was for !! But he figured if I did I would pay the steep price, and right he was. Bargaining took me right to the price the gent had advertised and off I was to chain it to the tape monitor loop, paired with my eq.

My first impression was the expander acted as just a big, sturdy 4 kg. loudness box, which basically it is, but there were subtleties it did to music in forms you had to hear for yourselves or download the manual from this website to fully understand (too complex to remember, but soundstage and noise reduction-related among other niceties) At first I ¨abused¨ of the settings and it was not unusual to find myself using it at full capacity to expand creepy old, low-budget recordings, which it helped enourmously. With time, I left it at its minimum of 4 db but ended up playing ALL of my music except for concert DVDs; even modern cd recordings benefits from a soft expansion, especially when played through a receiver with a modest headroom figure but cristaline tonal qualities like the SX-980. Using of higher settings hollowed the bottom end.

Its volume control acts as a sub-volume knob allowing the signal going into the receiver to be minutely fine-tuned. Signal-to-noise ratio is an insane 100 db so it never added any noise to the signal, not to mention it has a switch that allows one to bypass it nice and cleanly allowing the signal to go through it untouched as long as the unit is powered.

If it died on me or were lost or stolen, well, my music would never be the same. I love it. I am addicted to it. There were better expanders out there at the time ? Sure ! But none as beautiful and simple, and there is where its charm resided.

Hope I did not bore you fellas; I do exhit a tendency to ¨expand¨ on subjects I am keen on (pun intended :-D )



re: RG-2

My RG-2 is paired with a Pioneer SG-9500 equalizer. Working the two, I can dial in the best sound for me. I really like having the control, and love they beautiful silver interface. (OK, technically not silver, but you know what I mean...)

This website is not affiliated with or sponsored by Pioneer. To purchase RG-2 spares or accessories, please contact the company via their website or visit an authorised retailer.