EQ2A | stereo equalizer


The ELBERG EQ2A is a stereo equalizer designed upon the mono version in the ELBERG 1073. It has a second order (12 dB/oct) low cut filter, adjustable from 40 to 400 Hz, and the four bands are classical in their construction. Low and Hi shelf are Baxandall circuits with Low frequencies 40, 80, 120, and 240 Hz, and Hi frequencies 5, 7.5, 10, and 15 kHz. The two midbands are State Variable types, with LMF frequencies from 0.2 to 2.5 kHz, and HMF from 1.5 to 9 kHz, both with selectable bandwidth (Q) 0.5 and 1.5. Gain on all four bands are +/-15 dB, making the equalizer suitable for both subtle sound creations as well as a more surgical approach.


The ELBERG EQ2A is also equipped with two five LEDs meters (PPM), giving the user full view of the output level. The rear contains electronically balanced XLR inputs and outputs. Furthermore, a toggle switch will define if the chassis is connected to audio ground, 230 V ground, or floating. This may be useful if the device is mounted in a rack and thereby connects with other devices’ grounds.


The device is handbuilt in Denmark, and quality components are used throughout. The audio signal doesn’t pass through any of the push switches. Instead, the switches control high quality relays which make the actual switching.


The standard EQ2A requires 230 V/50 Hz. 115 V/60 Hz version on demand.


Frequency response:

10 Hz – 80 kHz (-1 dB)

Harmonic distortion:

<0.01% (+20 dBu out)

Input impedance:

10 kOhm

Output impedance:

47 Ohm

Noise EIN (Rin = 0 Ohm):

-96 dBA

Maximum out:

+24 dBu into 600 Ohm or greater

0 dBu = 0.775 V. All XLRs are connected according to IEC 268-12 (1=GND, 2=HOT, 3 =COLD).