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how to look inside speakers

HH-Bham said:
Not to rain on your parade -- your enthusiasm is wonderful -- but this is turning into quite a bit of work for what was probably a low-end Coral speaker to begin with. Refoam, remount caps, drivers to front, countersink drivers. While you're at it replacing the caps is basic maintenance on speakers that age.

All that and you've still got paper tweeters. Back in the day those were made, most good tweeters were horns. Paper tweeters were used on lesser speakers. Then advances were made in tweeter design and dome, ribbon, and other tweeters came . Read up on tweeter types here on wiki. There are, however, some speakers from the 70s that didn't use horn tweets that are well regarded but usually what made them special was a good tweeter.

So here is a completely different idea: if those cabinets are nice, then retrofit them with modern drivers and components from a place like parts express. You can get some real great sound that way. There are many threads here on AK about doing stuff like that. You have to match components to cabinet size and design (bass reflex (ported) or acoustic suspension (sealed)).
Click to expand...
Pick your project. Each will be a learning experience. Don't forget with new drivers comes a redesigned xover.
 
Don't forget the OP thought these Corals were the best ever before he tore them apart. Yes they are middle of the road to most of us but there are some Coral fans out there. All things considered I think I would reinstall the front baffle with some stout screws, maybe to some added bracing, make a new grille frame, velcro it in place and call it a day. The refoam and reglue the dust caps are worth it for most any speaker.
 
Thanks for your input, interesting reading indeed on the tweeter types---I'm not going to retrofit with new tweeters, one of the reasons that made me keep these guys was exactly for their sound quality even with the woofers needing to be refoamed.
Also, an interesting note. These tweeters are almost exactly like these Nakamichi that I have from the 80's. These Nakamichi are far the best in my opinion of-course. Maybe because of their internal design and acoustic or maybe not. I have a plan that I will follow hoping it will work out. $50 buks I pay for these.
Cheers
T


HH-Bham said:
Not to rain on your parade -- your enthusiasm is wonderful -- but this is turning into quite a bit of work for what was probably a low-end Coral speaker to begin with. Refoam, remount caps, drivers to front, countersink drivers. While you're at it replacing the caps is basic maintenance on speakers that age.

All that and you've still got paper tweeters. Back in the day those were made, most good tweeters were horns. Paper tweeters were used on lesser speakers. Then advances were made in tweeter design and dome, ribbon, and other tweeters came . Read up on tweeter types here on wiki. There are, however, some speakers from the 70s that didn't use horn tweets that are well regarded but usually what made them special was a good tweeter.

So here is a completely different idea: if those cabinets are nice, then retrofit them with modern drivers and components from a place like parts express. You can get some real great sound that way. There are many threads here on AK about doing stuff like that. You have to match components to cabinet size and design (bass reflex (ported) or acoustic suspension (sealed)).
Click to expand...
 
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I'm not putting the "crappy insulation" from the 70's back in the cabinets---

22 - removing safely the old insulation to avoid an hazard situation
23 - clean inside with ethanol, let it dry
24 - in a clean lab
25 - building a sound "stress back effect" with cork
26 - High conductivity, polished copper rods, grabbing the cork material from the back
27 - connect from bottom to upper
28 - rods, stick out of the top of the cabinets with polarization points---not care for any polarization at this point.
29 - build a protective box for now
30 - future, basic equalizer controlled from the top with a by-pass.

thanks!!! things are coming together! speakers will be back together with-in two months. equalization device might take 6 months like the 3D printer that I build---^ months to fine tune it!!!



Behind the effort there is passion, behind the passion there is people with the courage to try. Arthur B. McDonald, 2015
 
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