BLA – AM/CHA1

Inductor based 4-band stereo EQ

Features

  • 2U high rack mount chassis
  • 15 band, fully adjustable boost/cut with variable Q
  • Low boost/cut:  65Hz, 115Hz, 290Hz, Q variable from 0.2 to 1.5
  • Low mid boost/cut:  205Hz, 500Hz, 840Hz, 1.76kHz, Q variable from 0.2 to 1.5
  • Mid boost/cut:  560Hz, 1.2kHz, 3.1kHz, 6.1kHz, Q variable from 0.3 to 2.6
  • High boost/cut:  2.4kHz, 3.7kHz, 8.2kHz, 15.6kHz, Q variable from 0.3 to 3
  • Selectable peak or shelf for low and high frequencies
  • Fully transformer coupled input and output

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We’re all fans of inductor based EQ. While it doesn’t offer the surgical precision of its solid-state, gyrator circuit cousin, it has a wonderful musical quality that’s difficult to find in other EQ designs. In the past, a good inductor EQ was rather expensive to purchase, potentially setting you back thousands of dollars for a stereo pair. Cheaper versions were either unavailable or severely compromised sound quality due to cheaper components.

The search for an inductor EQ that sounds like the expensive ones, but doesn’t have the price tag, can be daunting…until now! Enter the AM/CHA1 EQ.

 

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Whats more

Since we enjoy a good challenge, our goal was to develop a transformer-coupled, two channel, inductor based EQ that could perform every bit as well as a high priced mastering-grade setup, but do it at a lower price. We gave the AM/CHA1 overlapping frequencies within each set of frequency bands to enable flexibility and frequency correction when needed. We use grain oriented silicon steel transformers for the input and output stages to give the audio a nice vintage character. And since we have access to a few mastering-grade inductor EQs, we tweaked and refined the circuit until we were satisfied that it was every bit as good as the expensive brands. It has the smooth highs, natural mids, and thick, powerful bass that only a good inductor EQ can deliver. We think you’ll be very impressed.

Amorphous core Lundahl transformers are available as an option for an additional charge. Please contact us for details.