6-Channel Polyphonic Active Electronics The RMC Poly-Drive II is a 6 channel polyphonic preamp with 3-band equalizer and guitar/synth controls in a Direct Box format. The unit measures 3.5″ X4.5″ X2.3″ and operates either from the onboard 9V battery or from bipolar phantom power (+/-7 VDC) typically provided by Roland guitar synths and compatible processors.
The Polyphonic section of the preamp buffers the separate string signals and routes them separately to the POLY OUT jack. The separate string signals are also combined in the ‘DMX’ feedback elimination circuit which produces a mono instrument signal. The mono signal is then equalized, passed through the INSTR. VOLUME control, buffered with a low output impedance Line Driver and fed to both the MONO OUT and the POLY OUT jacks.
- External to instrument for best acoustic performance
- Sturdy metal case for reliability on stage and in the studio
- 3-Band EQ with Mid-Frequency Select switch
- ‘DMX’ Acoustic Feedback elimination circuitry
- Synth Volume and SW1 & SW2 Synth Mode Selectors
- Excellent synth tracking and dynamic response
- Compatible with all current Guitar to MIDI converters
- Two output jacks: 13-pin DIN and 1/4″ phone
- Works on single internal 9V battery or phantom power
- Studio Quality performance 90 dB S/N typical
POLY-DRIVE II Remote Polyphonic Active Electronics
Designed to complement the exceptional sound and versatility of the Acoustic Gold pickup, the POLY-DRIVE II is by far the best Active Electronics unit available for steel or nylon string acoustic guitar.
Housed in a separate enclosure for minimum instrument modification, it features 6 ‘factory equalized’ string channels, feedback eliminator circuitry, a 3-band EQ with Mid-Range Frequency Select switch, and synth drive controls. Power can be supplied either internally by a single 9V battery or externally via the 13-pin DIN connector when the unit is connectd to a polyphonic processor, guitar/synth or MIDI converter.
The unit comes complete with a 6ft. multi-conductor cable and locking DIN instrument connector for easy operation and high reliability in demanding stage and studio applications. Longer cable lengths are also available at a slight surcharge.
complete with 6ft. multi-conductor cable & instrument connector
Accessories & spare parts :
DIN-8 instrument connector –
6 ft. multi-conductor cable –
15 ft. multi-conductor cable
I’m selling one of my five Roland GR-1 Guitar Synths, with the expansion card (200 additional Tones plus the 200 that come with the unit). ) And my programmed sounds installed If you want them. I can bring it back to Factory settings if not). You can install the included GK-2A Pickup on any steel string guitar (Acoustic or Electric). The unit contains Digital Reverb, Delay, Chorus and Flanging. It also has a Four part multitimbral via midi 2000 note internal sequencer.
The Synth comes with an AC adapter, GK-2A Pickup and Synth cable Group 3-4 card and a new internal CR 2032 disk battery. The expansion card alone is not sold anymore and is worth over $100 by itself. Practically all of the GR-1’s on E-Bay don’t have the card. The GK 2A synth pickup is also worth over $100. If you want a second GK-2A Pickup for another guitar, I have them ($125).
The GK-2A can be mounted on the guitar with 2 sided tape, screwed into the guitar surface with spring adapters (included) or mounted on a custom bridge right in front of the regular guitar bridge. My friend and Luthier custom fit the bridges to the guitars and attached them with 2 sided tape. then holes were drilled into the Custom bridge and either Rubber tube spacers (which I prefer) or small springs were used for the GK-2A height adjustments. If you do buy the GR-1. I can help you fine tunes the GK-2A Pickup adjustment.
The price for the Expanded Synth, Group 3/4 Card, A/C adapter, GK2A Pickup, Synth Cable, New internal battery and my Programmed Sounds is $400. If you look on E-Bay, you will see that this is a very fair price, especially with the Expansion Card, GK-2A pickup, new internal battery, custom sounds, etc. I have rotated this unit with my other GR-1’s so it’s in great shape.
Source: Roland GR-1 Guitar Synthesizer (incl. A/C Adapter,GK2A Pickup,13 pin Chord)