Ships same business day - FedEx 2Day® The EQ901B Plus is the next generation of the popular EQ901 B, a high performance replacement for existing BOSE 901® Series I/II, III/IV or V/VI equalizers (select your series when ordering). The EQ901B Plus features dual output equalization curves, Normal and Reduced Bass, either of which will accommodate your 901 Series depending on room size and personal preference. Based on modern hardware, the unit increases dynamic range while reducing noise and distortion to achieve state-of-the-art performance. As a drop-in replacement for existing OEM equalizers, the EQ901B Plus can be used in a tape monitor loop, between a preamp and a power amp, or with an A/V receiver and a separate power amp. Features The EQ901B Plus features two specifically designed equalization curves unique to each Series: I/II, III/IV or V/VI Precise 901 equalization is performed digitally in an Analog Devices 400MHz SHARC DSP processor with 24 bit resolution Two tone modes (on outputs 1-2 and 3-4, respectively) Ultra low distortion 2.0 Vrms output driver stage Selectable input sensitivity of 2.0 Vrms or 4.0 Vrms Specifications Total Harmonic Distortion: 0.007% 10Hz to 22 kHz Noise Floor: -105 dB @ 700 Hz DSP Engine: Analog Devices SHARC Digital Signal Processor Audio Input / Output Connectivity: Unbalanced Output, RCA Max Input Levels: 2.0 Vrms / 4.0 Vrms (jumper-selectable) Max Output Levels: 2.0 Vrms Input Impedance: 10 kΩ Output Impedance: 560 Ω Dimensions: 1.25” h x 4.25” w x 4.75” d Power: 12V DC Single Supply, 2.1mm round plug, 2.5 Watts EQ901B Plus platform base: miniDSP 2x4 HD Setting Equalization Curves Selection of the equalization curve is generally based on your listening room size and personal preference. The EQ901B Plus includes two curves: Normal mode Reduced Bass mode Optional Bose 802 EQ for all series Analog Input Level The analog audio input levels are switchable between 2.0 Vrms and 4.0 Vrms to accommodate use with most equipment. The EQ901B Plus is shipped with the analog input level set to 2.0 Vrms. User-accessible jumpers are used to set the analog input sensitivity. What’s Included EQ901B Plus equalizer for BOSE 901 Series I/II, III/IV or V/VI Two precision engineered equalization curves External power supply Support EQ901 equalizers have a 30-day, 100% satisfaction guarantee. U.S. domestic technical support provided by Deer Creek Audio. Live phone support available during business hours, or send us your questions via email. Deer Creek Audio is an authorized miniDSP dealer. Warranty Terms This product is warranted to be free from defects in materials and workmanship for a period of one year from invoice. Warranty does not cover failure of the product due to incorrect connection or installation, improper or undocumented use, unauthorized servicing, modification or alteration of the unit in any way, or any usage outside of that recommended in the product manual. The customer provides return shipping to Deer Creek Audio. Deer Creek Audio is an authorized miniDSP dealer. Shipping Orders received by 2 PM mountain time are shipped the same business day. U.S. domestic orders ship FedEx 2Day® for $12.95. Orders shipping to Canada are $24.95. For more details check out the FAQs on Buying from Deer Creek Audio. >> User Links