Offer Details

The MXR M281 Thump Bass Preamp uses an Echoplex Preamp circuit as its base, conditioning the bass signal with a balanced EQ profile. It has Bass control at 40 Hz (+15/-7 dBV), Treble at 4 kHz (±10 dBV), and a Mid control (±16 dBV) with Frequency sweep from 250 Hz to 1 kHz for precise tone shaping. Output knob handles level boost for solos or live mixes.True hardwire bypass keeps your signal clean when off. It's built in MXR's compact mini housing, drawing just 9 mA at 9V DC center negative. Input impedance is 1 MΩ, output 100 Ω, with a noise floor of -95 dBV—solid for bass players dialing in punch or edge on passive instruments.Controls are straightforward: footswitch with blue LED, Output, Treble, Mid, Bass, and Frequency knobs. Plug instrument into input, output to amp, set all to noon, and tweak from there.SpecificationsPower: 9V DC center negative, 9 mA current drawBypass: True hardwireTone controls: Bass ±15/-7 dBV at 40 Hz, Mid ±16 dBV (250 Hz-1 kHz sweep), Treble ±10 dBV at 4 kHzInput impedance: 1 MΩ; Output impedance: 100 Ω; Noise floor: -95 dBVConditionThis item has been tested and is in good working condition. It does not come with original packaging. It has no Velcro on the back. No power supply included.