Acoustat 2 plus 2

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Download the Acoustat 2 plus 2 owners manual
Request the Acoustat 2 plus 2 service manual


General information[contribute]

The Acoustat 2 plus 2 is an electrostatic speaker. It is part of the Mk-121 series. It was manufactured from 1982 to 1989.

Related models

The following models were also produced in the Mk-121 series:

Acoustat 1 plus 1
Acoustat 2
Acoustat 3
Acoustat 4
Acoustat 6
Acoustat 8


2+2, refurbishing project (by Alan Rhodes)


2+2, new frames (Ephraim Meyer, May 2003)
2+2, modifications (by Sam Kurutz)
2+2, build into 1+1 (by David Dlugos)
2+2, Plane wave control (by Sam Kurutz)

Forum topics on the Acoustat 2 plus 2

The following topics regarding the Acoustat 2 plus 2 have been found in the forums. If you want to start a new topic, click here.

2 Pair of 2+2\'s
4ohm vs 8 Ohm
5 wire panel with total of eight wires
5 wire panels
Acoustat 2 plus 2, Making a crackling/popping noise at low to medium volume levels
Acoustat transformers
Acustat one plus one
Amplifiers connected in parallel
Audio fuses for 2+2 -correct type
Biamplifiying the MK-121C
Bias Rectifiers
Building a home theatre set
Buzz (Revisited)
Buzz (Round Three)
Bypassing crossover
Dead biascircuit?
Different sound levels ( left > right )
Drastic loss of gain
Driving with two ML-3's
electrical current used
Frames, modified frames
Grill Cloth, Cleaning
Grill covers
Help Identifying C4 & C5 caps in MK-121-2A
High Frequency Loss
Identification needed
Interfaces, bad capacitor
Interfaces, corosion
interfaces, fuse problem
Interfaces, improve interfaces?
Interfaces, lost
Interfaces, Medallion Interfaces
Interfaces, problem
Interfaces, transformer broken
Interfaces, transformer info needed
Interfaces, transformer question
Interfaces, transformers needed
Leaving them on all the time?
looking for schematic for 2 plus 2 or any information
Making a crackling/popping noise at low to medium volume levels
Mylar type?
New frames
No volume or volume 20 dB down.
Ohms < 4
Output, amplifer issue
Output, low frequency gone
Output, lower output
Output, output problem
Output, very low volume
Pair of Acoustat 2 plus 2 with Transformers for Sale
Panels, felt on back of panel?
Panels, popping panels
Panels, rattling
Panels, rattling panel
Panels, rattling sound
pr. MK 121-C's, the gift of a friend!
replacement panels
Roy Esposito Contact Info
Set-up of acoustats
Speakers cause amplifier clipping
Spectra interface?
Spectra interfaces
Stereophile review needed
Stretched membrane !
Various questions
Various, exchange 2+2 for Spectra 44?
Various, how many manufactured?
Various, manual and modifications
Various, power handling
Various, resonant problem
Various, schematics needed
Various, servicing and modifications
Various, some questions
Various, some questions
Various, specs needed
Various, what to do with 2 sets of 2+2\'s?
Volume Problem