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In the Forum: Playback Listening
In the Thread: Remedies the Beauty
Post Subject: More progressPosted by N-set on: 5/28/2022
 Bill wrote:
Had problems 2 and 3 here with my British crossovers
  1. Both speakers have the 78 hz. Dip after a 50 hz. Peak. they are probably room resonances. Try moving the speakers and/ or the mike and remeasure.
  1. Also you have the same 1.2 kHz I saw with my British crossovers. Try reversing 5he tweeter leads and see what happens. Turned out the crossover reversed the polarity and the crossover is set at 1.2 kHz. With a second order 12 db crossover without correction for the phase reversal of the tweeter. Emailed the guy about this and he agreed. Found that by using the trinnov processor. Just reverse the tweeter leads and remeasure.
  1. Also you may want to adjusting the dip switches for position 3 to despcrease the extra tweeter output by about 3-5 dB.

Ad 2. Indeed you re right, inverting the tweeter ameliorated greatly the 1.2Hz suck out:
Inverted(purple)vsNoninvertedHF.jpg
I got some 5kHz & 8kHz peaks - this must be coming from my measuring setup, could not trace it and ignored.
Ad3. Putting the treble cut on the UK crossover alone did almost nothing (turquoise curve) but the HF cut + 3kHz notch filter
did attenuate the HF (dark green curve). No idea why so.

InbvertedHFStandard(purple)vsCut(green)vs3kHz(darkgreen).jpg

All started to sound very nicely, there is a certain magic in it. Next things to do:
- remove the old dope and put new on the Reds'

- B2 bypassing mod (new RCA sockets, bypassing the input crap, detachable power cord).

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