OH YEAH!
New 16 Ohm L-Pads installed, back to wonderful (more wonderful?).
..................................
the whole story
1. Ruin a good thing:
L-Pads removed as advised. Actually, they were 8 ohm pots, I didn’t know better way back when I replaced the original 16 ohm L-Pads. The Pots worked as needed, but altered the resistance shown to crossover, whereas the original L-Pads maintained 16 ohms shown to the crossover.
Speakers without controls were very screechy, horrible. Used RLC-1 to cut treble, at least sounded listenable while looking for a solution.
2. Research:
The Fisher President II I inherited used all Electro-Voice drivers, L-Pads, Crossover. They are in my new enclosures.
The Vintage Fisher consoles, and Electro-voice speakers were designed with L-Pads: AT37 (16 ohm) or AT38 (8 ohm). Two way had 1; Three way had 2 (Brilliance and Presence, like mine).
Adjust from Normal for room and personal taste.
NORMAL Room: Center position: Half attenuated.
LIVE, BRIGHT Room: add attenuation progressively
DULL, DEAD Room, reduce attenuation progressively
EARS AGE: reduce tweeter attenuation as ability to hear highs progressively reduces.
Model EV-SIX had a unique 5 position step-type attenuation control using resistors. As they were not progressive, 5 frequency graphs were shown in the engineering bulletin.
3. Re-install new L-Pads:
Ordered High Quality Pots, thinking they were L-Pads, returned them.
Ordered 16 ohm L-Pads.
Installed L-PADS yesterday. RLC-1 tone control back to neutral.
OH YEAH!
New 16 Ohm L-Pads installed, back to wonderful (more wonderful?).
..................................
the whole story
1. Ruin a good thing:
L-Pads removed as advised. Actually, they were 8 ohm pots, I didn’t know better way back when I replaced the original 16 ohm L-Pads. The Pots worked as needed, but altered the resistance shown to crossover, whereas the original L-Pads maintained 16 ohms shown to the crossover.
Speakers without controls were very screechy, horrible. Used RLC-1 to cut treble, at least sounded listenable while looking for a solution.
2. Research:
The Fisher President II I inherited used all Electro-Voice drivers, L-Pads, Crossover. They are in my new enclosures.
The Vintage Fisher consoles, and Electro-voice speakers were designed with L-Pads: AT37 (16 ohm) or AT38 (8 ohm). Two way had 1; Three way had 2 (Brilliance and Presence, like mine).
Adjust from Normal for room and personal taste.
NORMAL Room: Center position: Half attenuated.
LIVE, BRIGHT Room: add attenuation progressively
DULL, DEAD Room, reduce attenuation progressively
EARS AGE: reduce tweeter attenuation as ability to hear highs progressively reduces.
Model EV-SIX had a unique 5 position step-type attenuation control using resistors. As they were not progressive, 5 frequency graphs were shown in the engineering bulletin.
3. Re-install new L-Pads:
Ordered High Quality Pots, thinking they were L-Pads, returned them.
Ordered 16 ohm L-Pads.
Installed L-PADS yesterday. RLC-1 tone control back to neutral.
OH YEAH!