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Multi-Way Conventional loudspeakers with crossovers

Any threads on improving cheap speakers?
Any threads on improving cheap speakers?
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Old 14th April 2019, 12:24 PM   #1
ewollowe is offline ewollowe  Australia
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Default Any threads on improving cheap speakers?

Hi guys,

I grabbed a cheap and cheerful set of old sealed Sony 3 ways as a housewarming gift for a friend (along with an old marantz receiver they'll offer a huge improvement over the inbuilt tv sound) but after a brief listening session curiosity got the better of me so I opened them up for a closer inspection and well, they're poor to say the least.
Zero foam/fill, tiny magnets, minimal bracing, closed back midrange and tweeter cones etc etc The woofer appears to run fullrange and the other drivers simply have a cap on them.
I have a few ideas that I can implement with nothing other than some labour so I'd love to hear any suggestions for improving these?
I have an unlimited supply of the foam and am considering placing a lot of it behind the 10" woofer?
For additional bracing I have some broom handles that would fit the bill nicely?
Getting more complicated I have some small tang bands that fit into the midrange hole but that might open up a massive can of crossover woes?
What about making the enclosure aperiodic with a well stuffed hole?
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Old 14th April 2019, 12:38 PM   #2
Moondog55 is offline Moondog55  Australia
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Been there done that a lot
The foam helps as does a good bit of fibreglass stuffing
Some glue and corner blocking, bracing etc, slightly better caps on the tweeters but after that they will still be Cheap & Cheerful speakers, although there is nothing wrong with that.
Use them with a powered subwoofer so the small magneted 10: just does midbass and up works well, or even a passive .5 woofer with an inductor of suitably low DCR can work too
Foam is a very good start glued or stapled to the walls
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Old 14th April 2019, 12:52 PM   #3
ewollowe is offline ewollowe  Australia
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Oooh, interesting ideas, thanks for the feedback mate. You have any pics or other inspiration? They are indeed cheap and cheerful, for $25 they're very good value, they make quite a reasonable sound compared to much more expensive smaller junk.

It's good to know about the foam, what's a suitable glue for that? I have PVA and I think some adhesive spray but I know some foams love to melt with the wrong adhesive (I'm looking at you polystyrene) Given I have heaps of it would you think putting an additional layer would offer much?

I really like the idea of a sub (I've mucked about with my own 12" semi sealed design and it works wonders) but I need to keep this simple, the floorstanders are already probably going to take up more real estate than my friends had anticipated.

Edit. I am trying to keep costs down and not buy anything I don't already have.
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Old 14th April 2019, 01:29 PM   #4
AllenB is offline AllenB  Australia
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You shouldn't really get more than 1k, maybe 2kHz at the most from a 10" driver. There is probably a hole just above this region, and it probably has a peak in it from the woofer cone breakup.
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Old 14th April 2019, 01:38 PM   #5
ewollowe is offline ewollowe  Australia
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Quote:
Originally Posted by AllenB View Post
You shouldn't really get more than 1k, maybe 2kHz at the most from a 10" driver. There is probably a hole just above this region, and it probably has a peak in it from the woofer cone breakup.
I might fit the little 3" tang band I have in and see what happens? But for that to work well I'd need a pretty pricey inductor?

Edit and trying to bodge some chamfering (No routers here) to the chipboard enclosure to let the TB breath.
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Last edited by ewollowe; 14th April 2019 at 01:40 PM.
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Old 14th April 2019, 03:39 PM   #6
Bare is offline Bare  Canada
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Also replace the stock caps with cheap film 'n foils.
It will improve clarity noticeably.
Dunno if that's going to be a plus tho...IF the things are already shrill and tinny sounding.
But they will at least be clearer :-)
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Old 14th April 2019, 09:29 PM   #7
Moondog55 is offline Moondog55  Australia
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Unless you really want to spend a lot of money I'd not recommend using the TangBand.
Being open backed it would need an enclosure to be built for it and a proper XO
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Old 14th April 2019, 09:54 PM   #8
Guerilla is offline Guerilla  Denmark
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I imagine woodglue would hold the foam nicely. Wonder if some 6x9 carspeakers could be turned passive. Must be someone willing to give you some for free. Ofcourse a shame to make a hole in speaker if it dont work out. I guess the tangbands should have same sensitivity at woofer, or there will be more work with xover. Maybe one can wind coils oneself? Cool project. I dont think you need to spend money on it. Just use scrap
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Old 14th April 2019, 10:25 PM   #9
phivates is online now phivates  United States
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I have spent hundreds of hours polishing tur...nips like these. Dope the cones, thinned pva will suffice, one coat maybe two at most. Brace the box, maybe add a choke to the mid, cheap film caps...don't sweat the small magnet it goes with a sealed box. I go a little ballistic on the woofer basket with epoxy putty and gutter repair tape since it is playing well up into the midrange but don't give away too much time on this sow's ear. Leave that to me.
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Old 15th April 2019, 04:31 AM   #10
jmproductions is offline jmproductions  United States
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Quote:
Originally Posted by ewollowe View Post
that might open up a massive can of crossover woes?
I wouldn't worry about that, I'm sure there were big xo issues from inception.


Throw an inductor (any inductor lol) on that woofer. There has to be some garbage mid/highs beaming out of it.

Last edited by jmproductions; 15th April 2019 at 04:35 AM.
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