thread: ORBAN EQ ?!
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Old 22nd May 2009
  #9
Orban EQ's tend to be noisy if you boost HF EQ. That is because the order of filters in this series connected EQ design. The hf section is last in the chain so any noise is boosted by the HF EQ.

642's can overcome that by the use of low noise opamps and clever users can remove the 4 cards and reverse the order. That way the HF EQ comes first and noise is lowered during boost.

Jim Williams
Audio Upgrades