Sytek MPX-4Aii 4-channel microphone preamplifier  From Sytek

Excellent condition Used Sytek MPX-4Aii w/Burr-Brown op amps Chs. 3-4

Close

Our product photos are the actual, specific serial number for sale!

This specific item was photographed by us here in Durham, North Carolina. We are a very small team dedicated to providing you the most accurate photos possible, through our obsessive focus - individually photographing nearly everything that comes through the door. Questions about what you see? Want more information, photos, or just a friendly conversation with someone that cares and who has actually had their hands on this exact item? Contact us now!
Close

Buy Pre-owned from Sound Pure with Absolute Confidence

Sound Pure's dedication to pre-owned products is unprecedented in the industry. We are a small team of dedicated experts that buys, trades, and consigns. We are trusted by customers all over the world. Our curated collection, is thoroughly tested and inspected by some of the best in the business. Our inventory is constantly changing, ever-evolving, with some items sold before reaching the website. Looking for something specific? Have questions about this product's condition or history? Want more photos, or to simply chat with an expert who's had his hands on this actual piece? Contact us now.
Our Current Used/Vintage Collection »

Sound Pure's Consignment Program »

Luthier Certification for Used Instruments »

Sytek

"Gone, Baby, Gone"

This one is sold. Don't miss the next one. Some things never even make it to the site so stay up to date on our used collection.

We get in many oddities, rare and vintage products, most of which go fast. If you're on the hunt for something specific, something unique, or something priced right, let us notify you on our used collection before the items even hit the site.

Want to know if one lands?

Notify Me

Want to discuss what's coming?

Manufacturer's Description from Sytek

With modern techniques, the MPX-4Aii's transformerless input design rivals and even surpasses the best transformer-input designs that were the standard in the industry earlier. This is especially true in low-level input applications to achieve extremely low noise floor, minimum distortion, wide bandwidth and linear phase response. This approach can be obtained a warm sound, crystal clear and fast response, getting a step closer to the human ear characteristics.

Each MPX-4Aii unit uses a Class A, auto-bias bridge configuration, hybrid input stage preamplifier based on hand-selected transistors for the lowest of noise, and the lowest possible base-spreading resistance and collaterally matched for perfect balance, and biased at the precise levels that make them maximally insensitive to thermal drift. As a result, no offset crowding occurs, and the dynamic range remains wide open. Because of the wide gain-bandwidth parameters of these specially-selected transistors, and the super-low impedance characteristics, and the vanishing circuit reactance, the impulse response is optimum, and phase-delay distortion undetectable. Gain adjustments are made with balanced differential-mode cancellation, preserving the excellent DC offset characteristics, without altering the loop feedback characteristics from their optimal configuration.

Controls

A premium quality gain control is followed by three rugged but nimble pushbutton controls for each of the MUTE, PHASE, and 48V (Phantom Power) functions.
The MUTE control allows the individual preamplifier section to be silently switched out of service.
The PHASE control allows the inversion of signal polarity.
The 48V control switches on phantom power, necessary when using condenser microphones.
Additionally, each preamplifier section has a Peak indicator, set at -8dB before clipping the signal output.

Sytek

About Manufacturer

Sytek Audio Systems is a Chicago-based corporation that manufactures, sells, and supports a line of professional audio consoles for multitrack recording, post production, and broadcast.

Sytek also builds a line of quality auxiliary gear, including microphone pre-amplifiers and equalizers.

Specifications

  • Preamplifier topologyTransformerless Hybrid Design
  • Input Levelnominal -60 to -10 dBm
  • Gain+65 dB range (ref. input)
  • Maximum output24dBm loaded 600 ohms
  • E.I.Noise-134dBu (S.I.=50ohms) -129dBm(S.I.=150ohms)
  • THD+Noise0.0015 % at 60dB gain (@ 1kHz)
  • Signal-to-Noise Ratio> 100 dBm
  • Bandwidth10Hz-85 kHz +/- 0.25 dB
  • CMRR>100db at 100Hz
  • Phase Lin10 Hz - 20 kHz +/- 0.1 deg
  • Phantom P.S.+48V at 10ma (we can customize this for you)
  • I/O connectionsAuto-sense balanced/unbalanced XLR