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The SCR-DI by Ampeg is a single-channel, portable bass preamp intended for stage and recording use. Designed to bring tube-like grit to solid-state design, this DI provides on-board EQ controls and Ampeg's proprietary Bass Scrambler Overdrive, both of which can be switched on and off with the tap of your foot. Ultra-Hi and Ultra-Lo options are also provided, and a -15 dB pad jumper renders the unit suitable for both active and passive basses.
Housed in die-cast zinc and secured by rubberized feet, the SCR-DI offers multiple connection points: one 1/4" input, two auxiliary inputs (1/4" and 1/8"), an 1/8" (3.5mm) headphone jack, a 1/4" thru port for connecting parallel effects processing, a 1/4" unbalanced line out, and a balanced XLR output.
Finally, the unit features a ground lift switch to help eliminate electrical hum at the XLR port, and can be powered by either a 9V battery or a 9-12VDC external power supply (both available separately).
Legacy Ampeg preamp and tone-stack circuits
3-band parametric EQ with bass, mid, and treble
Proprietary Ultra-Hi and Ultra-Lo selectors
Proprietary Bass Scrambler Overdrive circuit help emulate classic Portaflex and SVT sounds
Separate drive and blend controls
Footswitches to toggle options on and off
-15 dB pad jumper underneath bottom panel mitigates high-output sources
Dedicated XLR balanced line output with ground lift
Affected 1/4" output
Unaffected 1/4" "thru" output
1/8" (3.5mm) headphone jack
1/4" and 1/8" (3.5mm) aux inputs for playing along to backing tracks
Die-cast zinc chassis construction
Rubber feet keep the SCR-DI in place
In the Box
Ampeg SCR-DI Bass DI/Preamp with Scrambler Overdrive
Limited 1-Year Warranty
Table of Contents
Signal to Noise Ratio
90 dB (20 Hz - 20 kHz, unweighted)
At 1 kHz:
Input: 24 dB; 45 dB, Scrambler in/max.
Aux Input: 27 dB
Bass: +14/-14 dB at 40 Hz
Mid: +5/-11 dB at 500 Hz
Treble: +16/-15 dB at 4 kHz
Footswitches: Scrambler On/Off and Pedal On/Off
Knobs: Drive, Blend, Volume, Bass, Mid, Treble, and Aux Level
Switches: Ground/Lift, Ultra-Lo, Ultra-Hi, and -15 dB Pad Jumper
1 x 1/4" instrument input
1 x 1/4" mono aux input
1 x 1/8" (3.5 mm) stereo aux input
1 x 1/4" thru output (unaffected signal)
1 x 1/4" unbalanced line out
1 x XLR balanced line out
1 x 1/8" (3.5 mm) TRS stereo headphone output
EQ: purple when EQ is engaged
Scrambler: green when Scrambler overdrive is engaged
Internal: 9 V battery (available separately)
External: 9-12 VDC at 100 mA (available separately)
Connector for External: barrel-type, center-pin negative