Learn More
Fall into savings! Fresh deals added daily. Shop Now.
Sorry, this product is currently unavailable. If you're looking for something that will be of a similar fit in your studio, please contact us using the methods below.

Benchmark MPA1 – No Longer Available

Two-channel mic preamp with stepped-resistor gain control, HPA2 headphone amplifier
MFR# 500-14600-000

Product Description

The Benchmark MPA1 is a two-channel microphone preamplifier designed and manufactured by Benchmark Media Systems, Inc.  The MPA1 is meticulously designed to Benchmark standards of transparency, ultra-low distortion, and ultra-low noise performance - making the MPA1 a perfect choice for stereo pairs, ribbon mics, and any other application where purity is the goal.

Pristine Input Stage
The input stage of the MPA1 is designed with high-voltage headroom (+29 dBu) and single-stage gain control to maximize signal-to-noise ratio.  The MPA1 maintains superb noise performance across the entire gain range (74 dB) by utilizing precision-matched, low-noise, transistor quad-arrays.  A servo-controlled circuit minimizes DC-offset and maximizes headroom.
Complete Low Frequency Response

The MPA1 exhibits exceptional low-frequency performance with a clever dual-capacitor AC-coupling design.  This dual-capacitor design defeats the limitations of single-capacitor AC-coupling designs, achieving an exceptionally low corner-frequency with excellent subsonic phase-accuracy.

Innovative Stepped-Resistor Gain Control
The gain control of the MPA1 is completely unique.  The gain is controlled via a 38-position, switched resistor ladder, set up in a continuously rotating orientation via relay control.  This gain control circuit offers 2 dB per step, 0-74 dB of gain without attenuation, and inter-channel gain precision of +/- 0.03 dB.  A make-beforebreak scheme creates a silent switching circuit.

Elegant Phantom Power Protection
The transistor stage is protected from phantom power surges with an ultra-fast, multi-stage protection circuit.  This circuit utilizes the high-speed capabilities of low-capacitance Schotky diodes and the high-current capabilities of TVS diodes to absorb the phantom power surges caused by shorts and plugging/unplugging microphones with +48V on.  This circuit is pre-biased so that it is isolated from the circuit in normal operation and activated when a surge occurs.

Product Specifications

Condition New
Tube or Solid State Solid State
Channels Dual-Channel
Chassis 19-inch Rack-mount
Rack Spaces 1u
Direct Input No
Digital I/O No

Product Reviews

No one has written a review yet. Be the first!

* Required Fields

Share Your Opinion

The best gear advice always comes from those who use it the most. That's where you come in! Let the pro audio world hear your voice with a review of the Benchmark MPA1. Once you submit your review, please check your email and verify your address to have it posted.

How do you rate this product?
I would like to thank VK for the wonderful sales assistance, service and prices. This was my first purchase with you and it won't be my last. I only wish I'd discovered you years ago!
Matthew R.
I had two Grammy wins this year - Ray LaMontagne & Carolina Chocolate Drops. Both made with help from Vintage King!
Ryan F.
In almost 20 years in Pro audio buying, never did I receive a unit so well packed and exactly as described. Works flawlessly. The whole process has been so smooth. I will never hesitate to do business with you guys in the future and will recommend you to everyone I know.
Martin C.
This was my first experience buying something from Vintage King (although I surf the "used" categories on the website frequently!), and, despite being on the other side of the world, I had absolutely no trouble and everything went very smoothly.
Phil T.
The speed of delivery exceeded my expectations! I was VERY pleased that my shipment arrived in time for a scheduled vocal tracking session. The packing insured that my order arrived safely. And the sales staff responded quickly to questions regarding the product.
James P.
Thank you so much! Vintage King has been so fair and easy to work with. I can't thank you enough. It feels good to trust such a hefty purchase to folks who are so helpful and knowledgeable. Vintage King is a sound designers dream store.
Noa L.
You guys have excellent customer service and I am excited about the next upgrade I complete on my fifth recording facility. I've been in the studio business for forty plus years. The salesman I worked with at Vintage King was the best of the best. You all rock!
Robby T.
I would recommend Vintage King to any one looking for top-class gear, unbeatable customer service and the best prices on the map!
Jake D.
My experience with Vintage King was excellent. The order was here fast considering it was out of stock. The sales person had SKB send it to me directly and I couldn't have been more pleased.
Michael D.
From the minute I placed my order I was kept well-informed through each step in your process. Even though I was buying a comparatively modest piece of gear, your attention to detail made me feel like I was purchasing a six-figure mixing desk.
Thomas W.
I am a new customer of yours. You guys provided me the absolute best deals in ordering all the equipment to power my brand new recording studio. Your customer service is amazing and i will always deal with you from here on out.
Rob M.
Thanks for your great service and getting this out today. You guys really are the Kings!
Alan B.
Better than expected! Truly impeccable service. Your team was professional, knowledgeable, provided speedy delivery above and beyond standard. Vintage King Audio is definitely my go to for all of my audio and information needs.
James O.