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Multi-Way Conventional loudspeakers with crossovers

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Old 1st May 2013, 04:47 AM   #21
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Geary,

I presume that you reconed those drivers yourself. Where did you get the kits from?
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Carl Huff
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Old 1st May 2013, 05:35 AM   #22
galyons is offline galyons  United States
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Originally Posted by Carl_Huff View Post
Geary,

I presume that you reconed those drivers yourself. Where did you get the kits from?
No, just re-foamed the surrounds. Given the age of the paper cones, although in very good condition, I did give them a light coat of the glue diluted with water to about the consistency of skim milk. Went heavier at the surround area and the cone neck.

I have had good luck with Simply Speakers for recone kits and Orange County speakers for in-shop recone.

cheers,
Geary
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Old 1st May 2013, 05:35 AM   #23
freddi is offline freddi  United States
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if I space, I'd load and fire mine up with PYM1298 (much like Kappa 12a) - might get one running as its already in place -what's your new crossover look like? my tweeters need new diaphragms.
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Old 1st May 2013, 07:06 AM   #24
galyons is offline galyons  United States
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Originally Posted by freddi View Post
-what's your new crossover look like? my tweeters need new diaphragms.
Simply Speakers or Crites are probably the best bets for good diaphragms.

The crossovers are still a work in progress. Listen, rudimentary measurement, tweak. I am working out component values, size, layout. The current iteration sounds quite nice, and is a major improvement over the stock crossover with the caps replaced, even with minimal burn in, so maybe getting close. (The stock crossover is still in place, so it is a simple switching of wires to compare!)

I am trying to keep the crossover pretty simple, minimalist. Every time I try to get too complicated, I don't like the results. The finished crossover will take the place of the stock crossover enclosed under the mid horn.

I think this schematic is pretty close to what I am listening to now.

Cheers,
Geary
Attached Images
File Type: jpg EV Sentry IVA Xover 1 low rez.jpg (116.6 KB, 77 views)
File Type: jpg Xover top.jpg (125.4 KB, 76 views)
File Type: jpg Xover side.jpg (127.4 KB, 74 views)
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Old 1st May 2013, 07:31 AM   #25
galyons is offline galyons  United States
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Originally Posted by freddi View Post
if I space, I'd load and fire mine up with PYM1298 (much like Kappa 12a) - might get one running as its already in place -
Here is an EV engineering frequency plot with three different woofers in the Sentry IVB:

Gefco, (Alnico)
EV ELM12
EV Force 12

Cheers,
Geary
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File Type: jpg Sentry_IVB_woofers_compare.jpg (169.2 KB, 76 views)
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Old 1st May 2013, 10:28 AM   #26
freddi is offline freddi  United States
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(i uploaded that a long time ago -info came from Jim Long) - those are MBGO(?) - is that bass inductor nicer sounding than say a steel-core ERSE?
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Old 1st May 2013, 03:49 PM   #27
galyons is offline galyons  United States
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I may have pinched the freq plot from you! The 30uF caps are MBGO, the 2uf caps are KBG, the 1uF are Good-All PIO. The bass coil is Solen. I don't know how it would compare to the iron core Erse. I am running such low power, (45 & 2A3 SET's), that saturation is an unlikely issue.

Cheers,
Geary
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Old 5th May 2013, 10:00 PM   #28
galyons is offline galyons  United States
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I think that I am close to where I want to be with the crossover. I moved the tweeter high pass back to 4750Hz with a 3uf cap. This improved the treble presence which was a bit lacking with the tweeter crossed over at the 6750 with a 2uF cap. This is the schematic of where I am today.

I am going to play around with the 1uf cap paralleled with the 2uF caps for the mid and treble. I will then bypass the mid 30uf cap with small value film or PIO cap. (Thinking .22 or .33 uf).

Cheers,
Geary
Attached Images
File Type: jpg EV Sentry IVA Xover 3uF low rez.jpg (111.8 KB, 54 views)

Last edited by galyons; 5th May 2013 at 10:18 PM. Reason: add pics
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Old 5th May 2013, 11:24 PM   #29
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This is cool...who needs Altec?
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Old 19th May 2013, 04:43 AM   #30
galyons is offline galyons  United States
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Originally Posted by phivates View Post
This is cool...who needs Altec?
Not me!!!

Cheers,
Geary
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