Electrodyne Audio 2511 EQ, Owner'S Manual

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Specifications
Owner’s Manual
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5 Electrodyne 2511 EQ ™
TECHNICAL DATA

Input: Active balanced discrete transistor impedance converter.

Output: Custom wound large format multifilar transformer

Output impedance: 600 ohms

+/-12 db gain range: Equalize or Attenuate

4 frequencies selectable per band. LF: 40, 100, 250, 500hz. HF: 1.5k, 3k, 5k, 10k.

Peak/Shelf sw each band: Shelving at all frequencies, Peaking: 250, 500 (LF), 1.5k, 3k and 5k (HF).
Distortion: 0.03%typical.

The Peaking and Shelving filters on the Electrodyne 511 and dual channel rackmount 2511 eq are
active inductor/capacitor (L/C), reciprocal, fixed-Q type. We made Q calculations based on the actual
Audio Precision sweeps of our production reference units and the results are as follows:

Peaking:

HF peaking Q = .35

LF peaking Q = .7

Q values are averaged across all peaking frequencies for each band.

Shelving:

HF slope approx. 3dB/ oct

LF slope approx. 4dB/ oct

HF characteristics: Flat shelf to over 200 khz at all frequencies (see frequency graphs –
Appendices A-D).

LF Characteristics: Shelf rolls back 3dB at 9hz, at all frequencies to avoid sub-sonic overload
issues with downstream recording equipment (see frequency graphs – Appendices A-D).

Maximum output: +30dbu at less than 0.8%thd, +29.5dbu at 0.06%thd. (measured with +/-16v power
rails).

Frequency response: +/- 0.25db, <10hz to >70khz typical (no filters engaged).

Signal to noise: -85db typ.
In line with our company policy of continuous development, the above specifications are subject to change without notice.