This Altec Lansing Graphic Equalizer Model 1431A is a great addition to any home audio setup. With its analog signal path and 15W power output, its perfect for enhancing the sound of your favorite music or movies. The unit has a sleek black design and comes with one input and one output. The equalizer is made by Altec Lansing, a trusted brand in the audio industry. Its a single-channel unit and operates on AC power. The Model 1431A is ideal for use in a home theater or recording studio.

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This vintage Altec EQ still works, and sounds wonderful. Beyond just boosting and/or attenuating, its Active presence adds depth and color to your signal, an irresistable special vintage mojo. The sliders have all been cleaned with DeOxit, and function smoothly with no unwanted noise. Key Features:Acousta-Voicette Technology:Utilizes special filters with sharp shoulders for a narrow bandwidth of 1/3 octave.Allows precise adjustment of the audio frequency band according to room acoustics and equipment characteristics.28-Band Active Filter:Monaural format with 28-element active filter.Provides fine-tuned control over audio frequencies from 20 Hz to 20 kHz with a ±1 dB accuracy.Versatile Connectivity:Supports both balanced and unbalanced inputs and outputs.Input impedance: 600/15k ? (unbalanced), 15/600/15k ? (balanced).Enhanced Signal Handling:Maximum insertion loss of -15dB at the center frequency.Low noise level of -90dBm at +21 dBm and -100dBm at +1 dBm.User-Friendly Design:Rack-mountable form factor for easy integration into your audio setup.Designed for mono applications, ideal for various audio systems and setups.Specifications:Method: Active equalizerFormat: Monaural, 1/3 octave band, 28-element active filterFrequency Characteristic: 20 Hz to 20 kHz ± 1 dBNumber of Filters: Mono, 28 piecesMaximum Insertion Loss: -15dB at center frequencyInput Level: +21dB or +1dBOutput Level: +21 dBm or +1 dBm (600/150 ? balanced output)Input Impedance: Unbalanced: 600/15k ?, Balanced: 15/600/15k ?Noise Level: -90dBm at +21 dBm, -100dBm at +1 dBmPower Supply Voltage: 120 VAC, 50Hz/60HzPower Consumption: 5W

This is an Altec-Lansing active filter or stereo equalizer unit, made in USA. I used this for many years with my home stereo system, but now must sell it. I havent used it for a while, so I tested it before posting it here on EBay, and it appears to work as it should. It has a clear plastic cover which must be removed for access to the band-adjusting sliders. This plastic cover has captured screws, so they wont fall out and get lost when the cover is off. When in place, the plastic cover is not only a nice dust shield but also keeps little fingers off of your carefully adjusted equalization settings. Note that there is no on/off switch, so if the unit is plugged in, its powered up. There is, however, a switch under the plastic cover which puts the equalizer in or out of the circuit. This item comes with spec sheet and operating instructions, and measures 18.5 W x 6 H x 7 D. It stands on four rubber feet and is not directly rack mountable without some type of user modification. There is one caveat: Anytime a unit employs wirewound potentiometers (sliders in this case), they can get dirty or a little corroded and youll get that scratchy sound through the audio system as the sliders are moved. Thats the case with this unit. I bet theres a way to clean these or improve this situation but I never bothered to figure it out. This is something that you may want or need to consider doing if you buy this unit. Heres some information on the specs from the flyer: Each channel (left and right) has 24 active band-rejection filters, so there are 48 total. The filters equalize ISO preferred 1/3-octave center frequencies from 63 Hz to 12.5kHz. Each filter provides up to 14 dB attenuation at the center frequency and is skirted to cross over with adjacent filter sections at -7 dB. Thus combined, the filters produce balanced, smooth response and ripple-free summation through approximately 85% of their adjustable range. A broadband reinsertion gain control is included with each channel. A three-position switch permits switching equalization in or out of the system, or switching to tape machine while maintaining equalization.

Reviewer after reviewer say these are possibly the best computer speakers you can buy. CNET used to use these so you know FX-6021s are great as CNET has an enormous budget and can use any brand and model they chose .The fx-6021 speakers have 12 micro speakers and a large subwoofer with a control unit which allows for on-off power, both base and treble adjustments , and volume control as well . There are 1 aux. port and one headphone port on each end of the control unit as well BUT the sound is the main asset because they will blow your mind . There are the usual scratches and usage marks but overall these are the pinnacle in the PC speaker kingdom.Also, all of the wires are included so just plug them in and you are ready to enjoy sound like you have never heard.There are one pair on Ebay international (Italy) for $330.00 USD delivered and there are none other anywhere whether U.S. or elsewhere and that is because people keep them because they are so good.Imagine gaming or movies or any audio source being played with premium sound .