4way OB project

[fivestring]

Six 12" woofers, two 5" lower mids, two 2" dome mids, one ribbon tweeter per side. Passive crossover at 300, 1200 and 4500 Hz, cca 87 db sensitivity, 30-30000 Hz frequency response, baffle dimensions 215x60x6 cm.

Cheers!



My site

[Helmuth]

Impressive fivestring,

Do you have frequency a plot.

Witch woofer did you use.

[fivestring]

Originally posted by Helmuth
Impressive fivestring,

Do you have frequency a plot.

Witch woofer did you use.

Thanks Helmuth. I can supply the frequency plot when I come home.
Woofers are of chinese origin with a Qts of 0.9. The lower and upper midranges are from Dayton, ribbon tweeter is Fountek.

[Helmuth]

Woofers are of chinese origin with a Qts of 0.9. The lower and upper midranges are from Dayton, ribbon tweeter is Fountek.

I can see you know what you are diong.

How about a review about the sound.

[fivestring]

Originally posted by Helmuth


I can see you know what you are doing.

How about a review about the sound.

Well, I`m not new in loudspeaker building (probably developed close to 200 different loudspeakers of all types over the las 15 years).
As for the sound, I am not exactly the right person to describe it, but those who heard it commented positively.
As you would probably expect, they give that big, effortless sound with great weight in the lover mid and upper bass regions. The stage is tall with good instrumental positioning and focus. The upper mids are way less congested on heavy material than a typical smaller loudspeaker (no wonder). With such passive (baffle) and active (drivers) surface area, the music sounds completely different, more real IMHO.To fully develop it`s potential they need somewhat bigger room, with 1-3 m distance to back wall. Of all the projects from my site, this was definitely the most satisfying one.
I am about to move it to one really large room and when done I can post some further comments.

Cheers!

[Helmuth]

I have to make you aware of the existence off a great dipole Air motion tweeter. Extreem low distorsion.
The Eton ER4. about 350euro.

[fivestring]

Have already tried it, excellent stuff but expensive! Made a 3way combination of ER 4, 7-372/32 HEX in open baffle and 8-472/32 HEX in transmission line tuned to 32 Hz. The sound was very interesting.

[Helmuth]

Witch one do you prefer fivestring the monopole fountec or the dipole ER4.

Because I am thinking about trying the ER4 once and for me 350 Euro is also not quite cheap.

Regards Helmuth

[inertial]

Hi,

You can try BG Neo3PDR.........

Cheers,

Paolo

[fivestring]

Originally posted by Helmuth
Witch one do you prefer fivestring the monopole fountec or the dipole ER4.

Because I am thinking about trying the ER4 once and for me 350 Euro is also not quite cheap.

Regards Helmuth

They are different animals, it depends on use. Eton has much larger total surface area vs Fountek and is therefore much more usable at lover crossover frequencies,
while Fountek definitely leads at higher frequencies. IMHO small ribbons aren`t usable at lower crossover frequencies, unless there is no need for higher spl. If you use steeper crossover, say 3rd or 4th and cross it over at 2Khz, you loose dynamics and you get typical hifi, upper mid hardness. I know there is a great number of commercial two way loudspeakers that are built like this, but they sound awful, just IMHO.
I agree with Paolo, Neo 3 (dipole type) could be a nice compromise, I haven`t tried it though (only Neo 8).

Regards Miro