©2019 by IronAgeAudioworks

LH95 Inductor EQ

User's Manual:

The Iron Age LH95 is a highly flexible, discrete class A active equalizer in the 500 series format. It features a discrete audio path, three vintage class A gain blocks, transformer balanced inputs and outputs, and an inductor mid band.

The equalizer is set up for broad, musical adjustments on the high and low end of the audio band with an active Baxandall stage. The high and low bands allow for up to 15 dB of shelving boost or cut in 3 dB increments, at 40 Hz for bass and 15 kHz for treble.


The mid band stage is a variable frequency presence filter using a custom-wound multitap inductor from Cinemag. It provides up to 8 dB of boost or cut in 2 dB increments. Boost and cut frequencies are approximately mirror-inverted.


Additionally, the EQ features switchable high pass and low pass filters with -3 dB points at 75 Hz and 13.5 kHz.
 

Block Diagram

Technical Specifications

 

Gain Range                                   +/-15 dB, bass and treble in 3 dB increments
                                                      +/-8 dB, presence in 2 dB increments
Maximum Input Level                    +18 dBu
Maximum Output Level                 +21 dBu
Input Impedance                           approx. 5.6kOhms, transformer balanced
Output Impedance                        <45 Ohms, transformer balanced
Frequency Response, set flat       +/-0.5 dB 40 Hz - 16 kHz
Noise                                             <-85 dBA
THD @ +15 dBu output                 <1% typical
Power Consumption                       approx. 90 mA 

EQ Frequency Response

If you are interested in owning one, please contact us at: contact@ironageaudioworks.com