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EQ901B-I/II - Replacement Upgrade for BOSE 901 I II Equalizers

EQ901B-III/IV - Replacement Upgrade for BOSE 901 III/IV Equalizers

EQ901B-V/VI Replacement Upgrade for BOSE 901 V/VI Equalizers

EQ901Elite Equalizer for BOSE 901 - Select Your Series I/II or III/IV or V/VI

EQ901PS Equalizer - Powered Sub Crossover for BOSE 901 - Select your Series I/II or III/IV or V/VI

EQ901USB Equalizer - Digital Preamplifier - DAC for BOSE 901 - Select your Series I/II or III/IV or V/VI

EQ901x Upgrade Program

Hypex NC400 Mono Block Amplifier - Unassembled DIY Kit

Hypex UcD400 Stereo Amplifier - Unassembled DIY Kit

miniDSP 2x4 Digital Signal Processor DSP - Programmable Active Crossover & Equalizer

miniDSP 2x4 HD High Performance DAC and DSP

miniDSP DDRC-24 USB DAC & DSP Digital Room Correction Processor Powered by Dirac Live

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