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-   -   Kofi Annan in: "Supravoxin'!" (http://www.diyaudio.com/forums/full-range/121360-kofi-annan-supravoxin.html)

Kofi Annan 15th April 2008 02:36 AM

Kofi Annan in: "Supravoxin'!"
 
Hey!

It's been a while since I've posted (a few family / work issues have prevented such things) but I'm interested in trying the Supravox Signature Bicone in an open baffle and I was wondering if anyone had any vendor recommendations for a US purchase.

The US Supravox distributor's site seems a little low on frills and may not have been updated for some time. I could try abroad, but I'm unfamiliar with any of the vendors I've seen

Any recommendations?

Kofi

gmilitano 15th April 2008 03:43 AM

The drivers look nice. Any idea on pricing? They don't look cheap. The parameters for the Supravox Signature Bicone look like they will work nice in an OB.

felixx 15th April 2008 07:00 AM

I use 215RTF Bicone in ob.
The sound is stunning.

Kofi Annan 15th April 2008 12:07 PM

Quote:

Originally posted by gmilitano
The drivers look nice. Any idea on pricing? They don't look cheap. The parameters for the Supravox Signature Bicone look like they will work nice in an OB.
They're well-suited to OB and many have reported excellent results. With the exchange rate and shipping, I'm thinking they'll be around $600US for the pair.

Quote:

Originally posted by felixx
I use 215RTF Bicone in ob.
The sound is stunning.

Amendment-- some have even reported stunning results.

felixx-- would you share your OB dimensions? Are you using them full range or with a "helper" tweeter? Any subwoofer?

OK-- so anyone know of a reputable distributor that would ship to the US?

Kofi

felixx 15th April 2008 02:53 PM

felixx-- would you share your OB dimensions? Are you using them full range or with a "helper" tweeter? Any subwoofer?

http://www.diyaudio.com/forums/showt...02#post1194102

Also I have a pair of Fostex T925A for help...10khz upper for really full range of bandwith.

The dims. on ob is not scarry:
-117cm-high
-41cm-wide
-15cm-deep
-20cm from the top to the center of the Supravox.
All measurements is from exterior of the baffle.

nicoch58 15th April 2008 06:58 PM

I order this week the Supravox Signature Bicone 600 in europe :rolleyes:

Konnichiwa baffle




nice and there is a space for alpha15" if the bass ....

je-lab baffle are good alternative ...

Kofi Annan 16th April 2008 03:38 AM

Quote:

Originally posted by felixx
http://www.diyaudio.com/forums/showt...02#post1194102

Also I have a pair of Fostex T925A for help...10khz upper for really full range of bandwith.

The dims. on ob is not scarry:
-117cm-high
-41cm-wide
-15cm-deep
-20cm from the top to the center of the Supravox.
All measurements is from exterior of the baffle.

Excellent! They look incredible!

Would you offer details on the crossover (unless you're bi-amping)? Also, what's the efficiency of the system? I'm planning to mate this with a 300b SET (~8W), so high efficiency is important for me.

Quote:

Originally posted by nicoch46
I order this week the Supravox Signature Bicone 600 in europe :rolleyes:

Konnichiwa baffle




nice and there is a space for alpha15" if the bass ....

je-lab baffle are good alternative ...


I have been working ona clone of Thorsten's OB as you have done. Let me know how these turn out as this is exactly what I was going to build, but I have some bass considerations.

My room is pretty big, so I think I will need some bass help to make it work.

Kofi

felixx 16th April 2008 07:42 AM

Quote:

Excellent! They look incredible!Would you offer details on the crossover (unless you're bi-amping)? Also, what's the efficiency of the system? I'm planning to mate this with a 300b SET (~8W), so high efficiency is important for me.
Thank you....a lot of work...
I run ob's with two amps.One (stereo)-tubes-for Supravox
(and I attached lately top mounted Fostex T925A-only a cap
from 12khz) and an solid state-lateral mosfets -stereo for
woofers.

http://www.diyaudio.com/forums/showt...27#post1033827

http://www.diyaudio.com/forums/showt...71#post1310471

Also I have an active cross from 300hz-down-only for
alpha's.On the Supra only a cap(300hz).Don't need notch
filter for Supra.
The alpha's have an Fs-41hz.With my cross. I touch 30-35hz
with a little help boost....a little one and depend of the
music listened in most cases.

For the Alpha's the active filter looks like this:
1-Shelving high-pass filter with 6 dB gain to transition
between the woofer on the floor radiating into half-space
and the main panel radiating into full-space.
2-Buffer-Low impedance drive source for the following
channel.
3-Low-pass filter for 12 dB/oct, 300 Hz L-R acoustic
crossover.
4- +/-2.5dB - Gain adjustment with 5 dB range and
precisely
linear dB scale.
5-Shelving low-pass filter to equalize the 6 dB/oct
roll-off of the woofer dipole response.
6- High-pass filter to block any dc offset voltage from
reaching the power amplifier for the woofer. The low cut-off
frequency of the high-pass filter reduces low frequency
phase distortion for improved realism of bass reproduction.
The operational amplifiers what I use are Burr-Brown
OPA2134.

This is the active 300hz cross for woofers....Linkwitz
design.

Eminence drivers gave my all I need in matter of bass.Soft,
a little silky and good impact.The Supra gave me all the details I
need -voices and instruments- extraordinary.The Fostex is
amaizing....no words for that.

On the pannels of the back of the baffle is glued some
absorber material(0,5" max.thick),the same absorber used on
the backloaded horns...Also the material on the frames
front and rear is the real acoustical one.When I listen
serious music I prefer to not have the front frame but that
one behind... I keep it.
This do the job right on that place.
I use active because the deep of the baffle is 15cm and if
I was going passive the dimmensions will be much more(maybe
double)....see Martin King baffle-wings closed.

If you going passive,seems a single L-coil still do the job
but the wide of the baffle need to be larger.And from
this point you need to start a new cross.
I myself tryed both and the active was more closed for my
preferences.The feeling is exactly like I was near on the
instruments....live performance.Maybe I will try another passive
in the near future....

The only care is to make sure you have at list 80-90cm
behind the speaker and from the lateral speaker to the
walls.
Front baffle is 45mm thick and the
laterals and also the
base plate 22mm...MDF material.

Kofi Annan 16th April 2008 01:56 PM

Thanks for all the details! You really put a lot of great work into that and should be very proud.

Unfortunately for me, I have just been reminded of the weakness of the US dollar in attempting to order the Bicones. What was once a $600 - $700 investment would now be almost $1,000, which is significantly above Mrs. Annan's limit for projects.

---PROJECT OFFICIALLY POSTPONED UNTIL U.S. ECONOMY OR MRS. ANNAN PERMITS---

END OF TRANSMISSION

KOFI

Scottmoose 16th April 2008 03:21 PM

Second hand? Although I suspect most owners hang onto theirs, so you'd have to go a-searching. Me, I need to hear a pair of their field-coils at some point.


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