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Crossover Assistance with Eminence Speakers

luvvinvinyl said:
The woofer is designed to have a compression driver fire through it. That said, like Gordon said, the APT-80 would be a better match.

Parts express has a Dayton crossover, already assembled, 2nd order L-R, (12 db/octave), crosses at 3.5kHz, that would be a very good starting point.

I used that one, years ago, with a pair of QWTL speakers using Beta 10CX speakers, with an Eminence compression driver firing through the centre.
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Actually- though it does have a large pole vent- it's not a coax driver.

I think that of the readily-available options- the Kappa 12A is pretty good, as its response is pretty flat, other than the small peak before rolloff. Many of the other Eminence 12" drivers have more of a rising response or peaks and dips in the broadband- which would be harder to deal with, and not so good with the prescribed amplification either...

Regards,
Gordon.
 
GordonW said:
Actually- though it does have a large pole vent- it's not a coax driver.

I think that of the readily-available options- the Kappa 12A is pretty good, as its response is pretty flat, other than the small peak before rolloff. Many of the other Eminence 12" drivers have more of a rising response or peaks and dips in the broadband- which would be harder to deal with, and not so good with the prescribed amplification either...

Regards,
Gordon.
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You are right, of course. I was looking at a current Eminence driver, of a slightly different model.
 
Atomic007 said:
Feel free to share any thoughts or ideas. I'm definitely open to suggestion.
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Understanding the challenge.. If you go by original spec, you will need to do some reengineering and "tech-no-refit" to have the new stuff work with the old. But it will be hallmark the name brand in the end and will undoubtedly cost a bit more :idea:.

If you go "upgrade" :dunno:, just putting in a working crossover to match the drive for your new speakers and consider a low power IC amp to make it work, you'll get the sound, but.. it won't be OEM.

Its a decision to make, and it really comes down to satisfying self, considering you are not looking to resell this on the "vintage" market.

I did a recent "Covid19 shut-in" rebuild, on a ChannelMaster receiver. It was pretty basic in design, had help, and ordered parts. It was a great re-schooling experience, soldering and the like. In the end, I was just happy to have it work.. not really relenting to OEM specs for a 1960 design. So I dig your flow.. and I am sure in the end you will be quite happy with your console.

It looks great :thumbsup:!
 
50nstillhifi said:
Understanding the challenge.. If you go by original spec, you will need to do some reengineering and "tech-no-refit" to have the new stuff work with the old. But it will be hallmark the name brand in the end and will undoubtedly cost a bit more :idea:.

If you go "upgrade" :dunno:, just putting in a working crossover to match the drive for your new speakers and consider a low power IC amp to make it work, you'll get the sound, but.. it won't be OEM.

Its a decision to make, and it really comes down to satisfying self, considering you are not looking to resell this on the "vintage" market.

I did a recent "Covid19 shut-in" rebuild, on a ChannelMaster receiver. It was pretty basic in design, had help, and ordered parts. It was a great re-schooling experience, soldering and the like. In the end, I was just happy to have it work.. not really relenting to OEM specs for a 1960 design. So I dig your flow.. and I am sure in the end you will be quite happy with your console.

It looks great :thumbsup:!
Click to expand...

Thank you for the input. I bought this cheap from the original owners grandson. He wanted to restore it original. He found caps, tubes, Jensen NOS speakers, etc. Couldn't find parts for the turntable. All-in, our local audio shop was looking at nearly a grand and he lost interest. With all that in mind I bought it with the plan to make it "look" OEM. Its something I want to keep not sell, so "it's only original once" doesn't apply here. Glad you're picking up what I'm putting down! Thanks
 
You'll want to seal the cabs and then port them, tuned to the correct frequency.
Is the bigger cab divided to isolate the electronics?
1.7 for high efficiency speakers is not much if you are looking for deep bass.
Are you planning for subs?
I think it would be cool to have one of those old consoles that actually DOES
deep bass and if that interests you, perhaps building Large Advents into them,
or an Advent Econowave would make sense.
 
I agree with the others who suggested an APT80, that seems like a better match for sensitivity. Also the Eminence Beta-12A might be a better fit for your boxes. The Kappa has a pretty low Qts and the bass might be a little lean.

If you decide to go with the APT80, I would suggest a simple first order crossover. Try a 2 mH iron core inductor in series with the woofer, that will drop the peak at 2.5k about 6 db. Then add a 1 uF polypropylene capacitor in series with the tweeter. Connect the tweeter out of phase with the woofer. This should result in a reasonably flat response with a slight downwards tilt and will hopefully sound pretty nice.
 
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Wow.. you are getting a lot of great suggestions :banana:from fellow Akers!

Its good to hear so many "audio-enthusiasts" are interested in a "vintage" rebuild... Makes me feel (at my age 55+) ... relevant :hug:!
 
50nstillhifi said:
Wow.. you are getting a lot of great suggestions :banana:from fellow Akers!

Its good to hear so many "audio-enthusiasts" are interested in a "vintage" rebuild... Makes me feel (at my age 55+) ... relevant :hug:!
Click to expand...

I agree! A lot of good information and I'm happy so many have shared their knowledge on this project. The only thing is, it's a lot to digest!
 
Pete B said:
1.7 for high efficiency speakers is not much if you are looking for deep bass.
Are you planning for subs?
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I have already considered the possible lack of bass from the vintage cabs and that's a definite probability. My back up plan is the amp has a sub out and I can add a powered floor sub in the future if needed.
 
Here's a source for some speaker kits that include the crossover components/design. Geared towards home theater use with a sub but that is where you are going to be with many 12" 2-way designs. More work but another option to consider is to modify the cabs into two compartments to go with an 8" 2-way design and a sealed subwoofer.

https://www.diysoundgroup.com/

Beautiful cabinets to work with. Good luck :thumbsup:
 
donprice said:
Here's a source for some speaker kits that include the crossover components/design. Geared towards home theater use with a sub but that is where you are going to be with many 12" 2-way designs. More work but another option to consider is to modify the cabs into two compartments to go with an 8" 2-way design and a sealed subwoofer.

https://www.diysoundgroup.com/

Beautiful cabinets to work with. Good luck :thumbsup:
Click to expand...

Thank you
 
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