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In Reply to: RE: Another Electro Voice Sentry IV-B crossover question posted by Precautious D on March 07, 2021 at 19:12:51
Bass amp remains connected to "input", mid-tweet amp connected to 1/4 jack.
Follow Ups:
This picture messes me up a little. I see the 1/4 jack coming from the woofer input push pins and plugging into the box. No?
In the picture you posted - the wire with the 1/4 plug is plugged into the woofer box. This is the completed passive system.If you "bi-amp" EV style all these connections remain as is. Then as you said, you connect another wire with a 1/4 plug from your mid-tweet amp to the bi-wire jack on the crossover.
As both amps are still going thru passive crossover components, It is a hybrid setup. Not so much needed for home use.
I would be more concerned about how you used your 16 ohm compression driver with the 8 ohm passive crossover.
Edits: 03/09/21
Thank-you for taking the time to respond.
I've decided to leave the stock 8ohm drivers in the speakers, so no worries about that!
In this EV style "bi amp" setup, do I need another active crossover to low pass the sub 400hz, or just use two amplifiers and let the crossover handle everything? If so, it seems to be a pretty brilliant little device, why wouldn't other manufacturers consider doing this?
I've listened to these with both a 2a3 SET amp and a little Tripath and both sound good, would like to use the tripath or other SS for the bass and 2a3 mid-tweet.
"If so, it seems to be a pretty brilliant little device, why wouldn't other manufacturers consider doing this?"
Can of worms- you opening
The series connected 4 ohm woofers would be be better served with separate amps for each woofer. Not needing the 1 woofer 1/4 pie.
The one woofer quarter pie is more than enough bass for now. Doesn't do sub bass, for that I'll look into the F20 design as well. My room is separate from the house and I live in the woods, so the sky is the limit. No WAF or neighbours = lucky guy indeed.
On a side note, I ordered a couple of switchcraft 1/4 jacks to try my hand at this form of bi amping. Anything else to recommend before I try this out?
"Next step will be a pair of Table Tubas"
Better served building two lilmike Cinema F20
Like you said no active crossovers needed, just level controls for the amplifiers.
Do your woofers look like these?
Yes they do. I inspected the surrounds the best I could and they appear to have been repaired at one point by the previous owner. Many of these drivers supposedly had foam rot.
I'm not actually using the stock bass bins. They are sitting on a pair of Claude1 designed QPies, which I had built to replace my LaScala's bass bins. The QPies work really well in my room, placed in the corners. Next step will be a pair of Table Tubas, I've been sitting on those plans for a couple of years. For now, the setup has plenty of bass.
I will eventually rotate the Sentry bass bins to lower the mid-tweeter horns.
I'll also order some phone plugs and try the bi amp out, sounds like it could be fun!
Nice looking setup, love to see it with the Sentry bass bins horizontal.
You could also put the tweeter above the SM120A.
That'S pretty close to what I want to do, though I'll attempt to physically time align the tweeter by setting it back.
Thank-you so much.
So I would need to solder a 1/4 plug to speaker wires which are connected to my mid-tweet amplifier?
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