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BA A70 cabinet speakers

post #1 of 12
Thread Starter 
These are my dad's old speakers that he retired from his bedroom for some lower-end, not so large, JVCs. I figured I'd ask to see what was needed to power these so I could finally replace my Logifail X-530's. I snagged two pictures of them, it's important to note that on the front it says impendence is 6ohms and on the back it says 8ohms.

We're looking for the cheapest route here, which I'm assuming is some sort of amp and speaker wire? (I already have a RCA to 3.5mm splitter from years ago).

EDIT:
Just did some googling and found this - 'Model: A-70 8" woofer, 1" tweeter | Years Produced: '82-'89 | Recommended Amplifier Power: 75 watts | Original USMSRP: $280.00/pr'

So with that added knowledge, any suggestions on an amp?
Edited by meeps - 10/9/11 at 1:30pm
post #2 of 12
any of these will work

http://www.parts-express.com/pe/showdetl.cfm?Partnumber=310-300&FTR=lepai%20tripath
http://www.parts-express.com/pe/showdetl.cfm?PartNumber=300-380
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=252-125

and get speaker cable from monoprice
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post #3 of 12
I don't think 15-20w RMS is going to power those so well. Vintage speakers like that (in my experience) tend to take a lot more power than they're rated for.

You're going to want a used receiver (or new) with 100w RMS per channel. You could "settle" for the Dayton DTA-100a mini amp, but be warned, it probably won't be enough to power those with only 50w RMS. I could be wrong, however...I've never used those speakers.

You said via PM to me that they need a refoam? Can we get some pictures of the actual drivers? You could always replace the 8" drivers with something else of course (would need box dimensions, port sizes, and impedance of the woofer at that point). You could do a refoam if you're comfortable doing so, I think 8" refoam kits are about $15-20 at parts express. Keep in mind, that's only a surround repair kit....not the cone.
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post #4 of 12
Thread Starter 
Quote:
Originally Posted by pioneerisloud;15238943 
I don't think 15-20w RMS is going to power those so well. Vintage speakers like that (in my experience) tend to take a lot more power than they're rated for.

You're going to want a used receiver (or new) with 100w RMS per channel. You could "settle" for the Dayton DTA-100a mini amp, but be warned, it probably won't be enough to power those with only 50w RMS. I could be wrong, however...I've never used those speakers.

You said via PM to me that they need a refoam? Can we get some pictures of the actual drivers? You could always replace the 8" drivers with something else of course (would need box dimensions, port sizes, and impedance of the woofer at that point). You could do a refoam if you're comfortable doing so, I think 8" refoam kits are about $15-20 at parts express. Keep in mind, that's only a surround repair kit....not the cone.
Well I won't be pushing these to their limits at all, since I need to keep in mind the sanity of the others who live in the house, so could less wattage still suffice for lower listening levels (while still wanting to slightly push them at times)?

And I took a few more pictures of the innards to show how sad looking these drivers are, they need a refoaming badly (found a kit for 18.50 with new cone heads as well, adhesives, instructional DVD).

How much do drivers usually run?

Edit: Oh and the box sizes are 14"x7.5"x24". 8" woofers, 1" tweeters
Edited by meeps - 10/9/11 at 3:39pm
post #5 of 12
Ewww, yeah man, those need a surround repair kit at minimum, those are nasty looking. eek.gif

Remove the woofers from the cabinets, and measure the impedance on the woofers themselves (you will need a multimeter to do this). Also, measure the diameter of the mounting hole. From there, we can figure out what to do for a new driver.

Is the enclosure ported or sealed? If its ported....man this will be tough. If its sealed, I'm sure we can find a good sealed 8" woofer to go in there.
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post #6 of 12
yeah those look pretty rough...

but about the lower-powered amplifiers/receivers - as long as you aren't planning on blasting them, they'll be fine. most of the time people are using a couple of watts. if you don't turn the amps up, you won't be clipping them/damaging the speakers. of course, if you can't get the speakers loud enough without maxing out the amps, that obviously means they aren't powerful enough.
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post #7 of 12
Thread Starter 
Quote:
Originally Posted by pioneerisloud;15239392 
Ewww, yeah man, those need a surround repair kit at minimum, those are nasty looking. eek.gif

Remove the woofers from the cabinets, and measure the impedance on the woofers themselves (you will need a multimeter to do this). Also, measure the diameter of the mounting hole. From there, we can figure out what to do for a new driver.

Is the enclosure ported or sealed? If its ported....man this will be tough. If its sealed, I'm sure we can find a good sealed 8" woofer to go in there.
Ha well I don't really care about the looks of them, they definitely are looking rough though and could use a repair kit.

Would the impendence be different from what's labeled on the cabinet?

And it's sealed.
Quote:
Originally Posted by gorb;15239430 
yeah those look pretty rough...

but about the lower-powered amplifiers/receivers - as long as you aren't planning on blasting them, they'll be fine. most of the time people are using a couple of watts. if you don't turn the amps up, you won't be clipping them/damaging the speakers. of course, if you can't get the speakers loud enough without maxing out the amps, that obviously means they aren't powerful enough.
Well I am very much into electronic music (along with many other genres including folk and such, electro is just a focus of mine) so I do crank it up when I get the opportunities, otherwise I'm usually using my HFI-580's to listen to music loudly. I probably should look into some higher powered components.

On that note, spotted a few used Sony receivers on CLs, running from $45-75, all of which are 100w/ch. Spammed emails, we'll see what that delivers.
post #8 of 12
Yes, the TOTAL impedance of the speakers are 8ohms (or 6ohms?). But the woofer could be 4 and the tweeter could be 4, making 8ohms in series total. It could be any sort of combination inside, so that's why you'll need to measure the impedance of the actual driver you're replacing. Plus you'll need the diameter of the mounting hole.

8" woofers can be anywhere from like $15-20 per driver up to like $300 or more per driver. Just depends on what you're going for. tongue.gif A simple replacement 8" woofer with close to the same specs will probably be under $50-75 or so each, not entirely sure without the full specs of the driver.
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post #9 of 12
Thread Starter 
Quote:
Originally Posted by pioneerisloud;15239676 
Yes, the TOTAL impedance of the speakers are 8ohms (or 6ohms?). But the woofer could be 4 and the tweeter could be 4, making 8ohms in series total. It could be any sort of combination inside, so that's why you'll need to measure the impedance of the actual driver you're replacing. Plus you'll need the diameter of the mounting hole.

8" woofers can be anywhere from like $15-20 per driver up to like $300 or more per driver. Just depends on what you're going for. tongue.gif A simple replacement 8" woofer with close to the same specs will probably be under $50-75 or so each, not entirely sure without the full specs of the driver.

Meh, not trying to spend anywhere near that money (although I'm sure it'd make them sound fantastic). I'd probably just do the foam repair kit and that's about it. If say down the line I feel the need to improve, then I'll look into replacing the drivers. I mean, I'm going from X-530's running in 2.1 to what I'd like to say is a step up thumb.gif.
post #10 of 12
Thread Starter 
In the processor of replacing the surrounds, just waiting for glue to finish drying so I can move on to the dustcaps.

Question:
Is it necessary to replace the gasket that goes on top of the surround's rim? I assume it's just for aesthetics because it's foam as well, except my kit didn't come with one and the old one isn't usable. The speakers covered so I don't care if it's strictly for aesthetics.
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