high efficiency 3way.

[piwonka]

the idea of building a high efficiency 3 way keeps pooping in my head.
it would be good if it were around 96db or greater. i have a 6watt SEP amp i like.

i'd probably keep the crossover first order.
what software (freeware perhaps) can i use to model frequency response?

i was thinking about using a Fountek Neo 3cd, Audax PR170mo, and for the woofer, which is hard. i was thinking about an Eminence CH2010 basslite
http://www.parts-express.com/pe/psho...16&ctab=1#Tabs
any ideas with that one?

i'd consider a dome tweeter if i could find one efficient enough.
as far as response should the tweeter be a little lower than the mid?
so maybe have the mid around 96db and use a tweeter around 94db?

thanks and sorry if these are newb questions.

[inertial]

Wow, first order with the Fountek? Seems difficult to my eyes......
Also the audax looks "problematic" with first order imo.
But I love first order a la thiel to say, I prefer sacrifice a bit of efficency and go 6dB when possible :-)
The peerless hds dome is about 93-94 dB and it is 8 ohm if I well remember.

Cheers,
Paolo

[piwonka]

i was thinking the low pass on the audax might be hard.

also, i remembered i have a GR research (gr-t6 i think it is) dome tweeter that is 6 ohm and 96db sensitive....

i figured the fountek would cross at about 4.5k or 5k. (madisound says 2nd order at 2500hz is good).
audax maybe 700hz to 2.5k
the ch2010 have a high pass around 250hz or 300 hz.

if i can't keep the design sensitive there is not much point in doing it.

also, i dont' have the equipment to take my own measurements so i need to model this stuff with software.

another question. how much sensitivity would i lose by going 2nd order on the mid and tweeter?

[inertial]

Originally posted by piwonka
i was thinking the low pass on the audax might be hard.


another question. how much sensitivity would i lose by going 2nd order on the mid and tweeter?

Maybe do you mean the H/P of the audax....it has very low Xmax.


You'll lose nothing exerpt transient perfection

Cheers,

Paolo

[piwonka]

yeah sorry, h/p of the audax is what i meant to say.

[Peter M.]

How about a two way with a fullrange driver like fostex fe126e and a 15" instead of the 10"?

Simpler to get right without measuring, and gets you more low freq extension.

[piwonka]

i thought about a full range with a sub for a low end ext.

i have some 2 way now that use an eminence alpha 8" with a vifa tweeter in a bass reflex box. sensitivity is just enough.
i'd kinda like a little more midrange detail, a little more sensitivity and also a bit more low end extension...

how do the full range drivers sound? i'll have to do some searching as i haven't really looked into them much at all.

[John_E_Janowitz]

I'll point you to a couple threads people are doing for high efficiency 3ways right now.

This is a 3way using the TD12S and neo pro5i
http://www.avsforum.com/avs-vb/showthread.php?t=1035126


using TD12S, phl mid and neopro5i
http://www.avsforum.com/avs-vb/showthread.php?t=1061558


The Basslines by dlneubec. These were inspired by the salk system below. He did quite a bit of waveguide experimentation to get the dome tweeter efficiency up.
http://www.htguide.com/forum/showthread.php4?t=29988

The salk system that inspired the one by dlneubec.
http://www.audiocircle.com/circles/i...?topic=54161.0

John

[piwonka]

thanks john, i'll look at those when i have some time.

[dublin78]

http://www.troelsgravesen.dk/JA8008_DTQWT.htm

I can't wait for an excuse to give these a go.

One day...