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-   -   New to DIY... Looking for something w/ high sensitivity. (http://www.diyaudio.com/forums/multi-way/51162-new-diy-looking-something-w-high-sensitivity.html)

DonoMan 9th February 2005 06:38 AM

New to DIY... Looking for something w/ high sensitivity.
 
Well, my current receiver is a Technics SA-DX950, 100W at 6 ohms, but my current speakers are KLH 9912 = 8 ohms... 75W from the receiver, 90dB on the speakers... Not loud enough for me. I've got a NAD T-752 in the shop now. So I got to thinking I should get some decent speakers.... $150 per speaker (for drivers) max.

I'd like something with 95-96dB sensitivity, but the LDSG is saying no way. I'm thinking maybe something like this to get me ~94dB:

MTM Setup:
Tweet: Peerless 811830 (DT100)
Mids: (2) Audax HM170C0 6.5" 91dB 60W ea, 43Hz Fs

The only other affordable 93-94dB setup I can think of is a TMMWW configuration:
(1) Peerless 811830 (DT100)
(2) Seas MP12VC 4.7" 90dB 90Hz
(2) Vifa P21W0-20-08 91dB 28Hz (Classic Series 10")

And even though this one isn't high sensitivity, here's the first combo I thought of (TMMW):
(1) Peerless 811830 (DT100)
(2) Vifa M10MD-39-08 (Classic Series 4")
(1) Peerless 850136 (CSX217H)


Any of those seem decent to you guys? Any better suggestions?

Thanks!

Nappylady 9th February 2005 06:47 AM

You have very loud tastes! :-P Do you *really* listen to them loud enough that the amplifier clips?

For my PA system, I use the Goldwood 10" pro woofers (94dB sensitive; Znom is listed as 8ohms but look at the impedance graph--these are 6ohm drivers) I got from Parts Express, #290-380. Tuned to 40hz in a 2cuft vented box, they're very loud. You should be able to get 114dB out of each of them in this configuration.

The downside is that they get thin midrange pretty fast; cross over at 200hz (yes really) to keep the sound from disappearing. Of course, this basically requires an active XO, because inductors that large are really hard to come up with.

For the top end of my sound system, I found some 5" full-range car speakers for $0.69 each and built open-baffle line arrays. With the treble control on the reciever turned all the way up, they actually sound quite tolerable to my ears. People with more discerning tastes balk...

simon5 9th February 2005 06:54 AM

You could use a big classic woofer, like a Eminence Alpha 15A, with a good tweeter, and easily achieve 94 dB sensivity. I think there will be money left, so you could include maybe two midrange units to do a TMMW.

simon5 9th February 2005 07:09 AM

You could also look at these kits from Adire Audio, the HE10.1 Mark II (95 dB / 1W / 1m) for 300$ per pair and the HE12.1 Mark II (96 dB / 1W / 1m) for 369$ per pair.

Everything is included, the crossover, the drivers. You add the wood and assemble.

Go in the DIY section and look under Kits menu on the left.
http://www.adireaudio.com/

MethMan 9th February 2005 08:14 AM

2 Attachment(s)
Reasonably cheap (here for 65 USD) Beyma 12BR70 95dB/2,83V/1m/halfspace. Or Beyma 12B100/R (for 145 USD) 94dB/.... Both from Studio Line.
I think the drivers should be even chaper in US.
More on www.beyma.com

DonoMan 9th February 2005 08:21 AM

I'm looking to do 60" towers

DonoMan 9th February 2005 08:21 AM

Those do look nice, MethMan. Can you comment on how they sound?

MethMan 9th February 2005 08:30 AM

Beta CX12 itself used within the kit HE12.1 mk II cost only 85 each.
Measurement of the low part can be found here: http://www.prodance.cz/protokoly/beta12cx.pdf

DonoMan 9th February 2005 08:41 AM

That beta only has an Fs of 45.44Hz. I will be using this for movies and stuff too so I'd say that's a bit too high for me. The first link you gave had an Fs of 25Hz while still having a good SPL, though. So as long as I can get some opinions that they sound pretty decent, I think I may build a sub with 1 or 2 of those bad boys.

Thanks for the info, and please keep it coming guys, if anyone else has anything to chime in, it would be much appreciated.

DonoMan 9th February 2005 08:41 AM

Er, sorry, 35Hz for the one you posted first.


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