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Old 30th September 2010, 09:02 PM   #1
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Default High Eff. Low Budget Sub - Ideas Wanted

We've got one of Jack Hidley's 80w 8r / 115w 4r sub amps coming, so now we need to start thinking about what we're going to hook it up to... Anyone care to dream up some stuff with us?

I, and the friend I'm assisting in the build, have become enamored of the big dynamics sound. So while we probably don't need unusually high sound levels (for home listening), high efficiency would be good.

Electronic music is on the menu, but to keep our requirements somewhat modest a solid 30 hz should be sufficient on the low end. The sub is to be partnered with a pair of B20 Changs. Extended low frequency performance would be a plus, but this is intended as a music sub.

Largish (less than 8 cuft) is probably acceptable, and if it can be made thin enough (I dunno, < 8 in.?) to hide behind a sofa then Really Big might be ok.

To keep in line with the inexpensive amp from Jack, a cheap driver is what we're looking for. Just to pick a number, sub-$80. Cheaper is better.

Any ideas? Is the MCM 55-2421 (the $35 8-inch) still showing up regularly? It looks like it's on backorder currently (oh, look, I guess they expect it back in soon). What are some other community favorite bargains? And while I can stick a driver in a ported or sealed box, any proponents of tapped horns and other special boxes are encouraged to speak up...

Thanks for your input!
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Old 30th September 2010, 09:28 PM   #2
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Default efficiency ?!?

You guys need a big and expensive 15" woofer to do that ,in a very big cab
(double reflex bandpass enclosure)
Otherwise , pick your favorite between Peerless XLS / XXLS 8 or 10" ,or Tang Bang . A cube with 10" sides ,sealed ,is Ok . Two cubes are better ,placed near the main speakers ,and parallel connected to the same amp .
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Old 1st October 2010, 01:48 AM   #3
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Four MCM 55-2421 in ~172 L = ~120 dB/80 W/2 pi from ~30-300 Hz:

GM
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Old 1st October 2010, 02:59 PM   #4
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Thanks for the input!

I was considering the Peerless xls 10" that PE has for $55.

And while 2 of the 55-2421 is do-able (and I would be pretty happy with, except they're 4 ohms each and I don't expect the plate amp wants to see a 2 ohm load), 4 is moving outside of our price range. I'll certainly take the idea to my friend, though. Bill Fitzmaurice's Table Tuba sounds like a pretty good idea for this driver, anyone have experience with it? If you're familiar with the TT, what other drivers have been used successfully? I'll have to research that one some more, if it delivers what it says it sounds like a goodie.

I was also considering MCM Audio Select 12'' Dual Voice Coil Woofer | 55-1465 (551465) | MCM Audio Select. Fs = 25 hz, Vas = 203 L, Sensitivity = 94 db, Xmax = 5.0 mm. So it'd be nice if the Vas was a little smaller, though I haven't actually drawn up a design for it so maybe I can get away with squeezing it a bit. The 94 dB sensitivity is nice. While the Xmax could be greater, it doesn't really need to be able to blare out crazy amounts of dB. I just want it to have a dynamic quality to it, and have it work well with the modest plate amp we've got. Anyone aware of previous successes with this driver?

Any other thoughts?
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Old 1st October 2010, 03:50 PM   #5
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Hi,

I used a pair of the 8" version of that driver. They work well enough, cope with some abuse, and the bass they put out is more than just a one-note thump (though they can do that if you like).

Good luck!
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Old 1st October 2010, 04:42 PM   #6
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Thanks, Chris. Is that this driver? - MCM Audio Select 8'' Dual Voice Coil Woofer | 55-1455 (551455) | MCM Audio Select

That 3.0 mm xmax looks a little thin, do you feel like this driver exceeds it's xmax smoothly, or does it bottom out right away? Do you know if the parameters they list are accurate?
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Old 1st October 2010, 08:25 PM   #7
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Quote:
Originally Posted by AdamThorne View Post
Thanks for the input!

..........except they're 4 ohms each and I don't expect the plate amp wants to see a 2 ohm load)...........

If you're familiar with the TT, what other drivers have been used successfully?

While the Xmax could be greater, it doesn't really need to be able to blare out crazy amounts of dB. I just want it to have a dynamic quality to it, and have it work well with the modest plate amp we've got. Anyone aware of previous successes with this driver?
You're welcome!

This is what series wiring is for.

Not beyond reading about other folk's 'adventures' with them, including the occasional wienie roast. Plenty has been written about them on various forums, so Google is your friend.

Anyway, like so many folks who drop in here, you want more performance than you can afford in one or more ways, so I gave you the closest match I could think of.

GM
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Old 2nd October 2010, 12:11 PM   #8
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Quote:
Originally Posted by AdamThorne View Post
Thanks, Chris. Is that this driver? - MCM Audio Select 8'' Dual Voice Coil Woofer | 55-1455 (551455) | MCM Audio Select

That 3.0 mm xmax looks a little thin, do you feel like this driver exceeds it's xmax smoothly, or does it bottom out right away? Do you know if the parameters they list are accurate?
Yeah, that's the one.

I used them in a sealed cabinet, so accuracy of the parameters weren't paramount. They do match the sims closely, however.

When it comes to excursion, they pass Xmax it quite smoothly. They will do 16mm p/p when bottoming out, but they seem happy enough to around 8-10mm p/p. After that, you get harmonics and it becomes easy to locate the sub. Still, 3mm one way is 6mm p/p and it's still linear. Not bad for the price etc etc. Expect 2-3 times the Xmax (p/p) before bottoming out... So that sets the 12" at 20-30mm... Should be sufficient.

Chris
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Old 13th October 2010, 04:05 PM   #9
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Quote:
Originally Posted by chris661 View Post
Yeah, that's the one.

I used them in a sealed cabinet, so accuracy of the parameters weren't paramount. They do match the sims closely, however.

When it comes to excursion, they pass Xmax it quite smoothly. They will do 16mm p/p when bottoming out, but they seem happy enough to around 8-10mm p/p. After that, you get harmonics and it becomes easy to locate the sub. Still, 3mm one way is 6mm p/p and it's still linear. Not bad for the price etc etc. Expect 2-3 times the Xmax (p/p) before bottoming out... So that sets the 12" at 20-30mm... Should be sufficient.

Chris
Hi Chris,

If you don't mind me asking, where did you source the drivers from? I'm looking at building one of the Bill Fitzmaurice subs (Tuba 18) using these drivers and didn't have any luck sourcing a UK/European distributor.

Regards,
Ewan
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Old 13th October 2010, 07:16 PM   #10
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Hi Ewan,

No problem at all: I used CPC.
--|55-1455|DUAL COIL WOOFER 8" | CPC
They have free shipping over a certain price, so it might be an idea to order some other bits you'll (undoubtedly) need.

I can supply a full T/S PDF if you like.

Chris

Edit - http://www.youtube.com/watch?v=DK7WuH8iIuU - the tape is 10mm along the shortest dimension. At this point, harmonics begin to become prominent. It's fine for levels lower than that. Sorry about the camera's mic quality, it was just to give people an idea of cone travel.
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Last edited by chris661; 13th October 2010 at 07:25 PM.
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