Check the listing for details. EQ901 Platinum Replacement Equalizer / Preamplifier for BOSE 901 Speakers - RCA. Color: Black, Condition: New. Listed at 689.00 USD. EQ901 Platinum Replacement Equalizer / Preamplifierfor BOSE 901 Series Speakers - RCA I/O Version In StockSame Business Day ShippingInternational Customers - See eBay Global Shipping & Duty Rates in Cart The EQ901 Platinum is Deer Creek Audio's flagship equalizer / preamplifier for the legendary Bose 901® Series speakers. The EQ901 Platinum features four specifically designed equalization curve sets unique to each series: I/II, III/IV or V/VI (select your series when ordering). The EQ901 Platinum is also a high fidelity digital preamplifier intended to drive high quality power amplifiers, integrated amplifiers or receivers. Analog, USB, SPDIF, TOSLINK and high definition LDAC Bluetooth streaming inputs are included. When used in the digital input mode the music stream is maintained in the digital domain all the way through the 901 equalization process. This is the purest and highest fidelity way to drive your 901s. The RCA I/O version is our standard model featuring stereo analog input and four channels of analog output, all on RCA connectors. FeaturesPrecise BOSE 901 equalizationThe four BOSE 901 tone modes (EQ curves) are available on all four outputsNormal modeEnhanced modeWarm modeLow frequency reduction modeTwo identical stereo pairs outputs are available, allowing for dual active stereo systems (two stereo power amps) or the addition of an active subwoofer(s)Remote volume control with 0.5dB resolution and muteInputs - remote selectableBluetooth streaming - LDAC CD qualityAnalog RCAUSB audioTOSLINK / SPDIF (RCA / optical)Output OptionsSingle-ended analog I/O (RCA)OLED front panel display and volume control knobUltra low noise and distortion SpecificationsBluetooth streaming: LDAC™/aptX™ HD/aptX™/AAC/SBCInputs: Stereo digital (USB Audio / SPDIF / Optical / Bluetooth), stereo analogOutput versions: Unbalanced (RCA) or balanced (TRS)SNR (Digital to Analog): 121 dB(A)Analog Audio Input Impedance: 100 kΩAnalog Audio Output Impedance: 200 ΩAnalog Devices Floating point DSP SHARC ADSP21489 @ 400MHZMulti-Core USB Audio processor (XMOS)Dimensions: 150mm x 180mm x 41mmPower Supply: External PSU 12V/1.6A (US/UK/EU/AU plugs)Power: 10.3 W (idle) 3.1 W (standby) What’s Included EQ901 Platinum equalizerIR remoteExternal power supply (UK/EU/US) Setting Tone Modes Selection of the tone mode is generally a subjective choice based on what sounds best to you. Normal mode is the most neutralEnhanced mode provides a tighter soundWarm mode adds midrange with slight treble reductionLow Frequency Reduction mode is intended to control bass in smaller rooms or on “boomy” recordingsSupport 30-day 100% satisfaction guaranteeU.S. technical support through Deer Creek AudioInstallation guide and phone supportDeer 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.