Accuton 3-ways ?

[Jussi]

Hi,

Got a new project coming up and one strong candidate to midrange duty is C95-11 Accuton, two on each side in MTM configuration. Already have Dynaudio T330D Esotars for treble and thought to use single large woofer on each side in separated compartment for bass.

Bass is going to be dipole config. With separated enclosure I can turn them separately from mains and search best accuracy in room. Mains are going to have so called acoustic resistance cabinet and radiation pattern something between cardioid and hypercardioid.

As midrange I've looked up some candidates. Itself proven W18EX Excel is one, C95-11 another. Also considering some Peerless HDS and Seas standard models for budget variations. Crossover frequences around 100-150Hz and 2-2,5Khz.

Linkwitz didn't consider C92 that good in his tests before Phoenix project. Linear distorsion shows some energy storage. I assume this is a problem with suspension. C95 has somewhat different suspension. Rms is lower and Qms higher.

Does anyone have experience and maybe reliable response and distorsion measurements from this Accuton model?

Other comments, advices and recommendation are also very welcome.

Best regards,

Jussi

[ScottG]

I've heard the Esotars several times.. and they are not really suited to the accutons.

Instead look for a paper or carbon driver with an fs of at least 50 Hz..

Considering the Esotar's character and the desire to use 2 drivers (but keep the cost reasonable..) this is the driver I'd probably choose:

http://www.madisound.com/pdf/audax/hm130c0.pdf

They should complement the Esotars perfectly.

Note though that Audax is pulling out, so get'em while they are available.

[Jussi]

Hi Scott,

What kind of character Esotars have? What about Accutons? Would W18EX be better match with Eso?

Thanks!

Jussi

[ScottG]

Originally posted by Jussi
Hi Scott,

What kind of character Esotars have? What about Accutons? Would W18EX be better match with Eso?

Thanks!

Jussi

Sorry its taken me so long to reply (..computer down).

I've found the character is a bit softer (less of a sibilant "edge"), while still being quite transparent. (Its a fantastic driver.)

Neither the Accutons or the Seas (METAL) drivers should be used. You could use a Seas paper design or their poly coated paper (but see what I've written below).

For instance I've heard an older Kharma loudspeaker (3-way) that used the scan speak revelator (similar in sound character to the esotar - though less transparent) with an accuton midrange. There was an audible discontinuity to the speaker both in terms of transparency and tonality (..and I'm pretty sure the difference in tonality was not due to freq. response problems) between the two drivers.

Now the Convergent Audio Technology (CAT) reference speaker I've heard specifically uses the esotar while using either a poly only (or a poly coated) seas driver with the excel driver assembly for the midrange (in an MTM). This was considerably better, however the seas was just a little less transparent and overdamped tonally in comparison to the esotar.

Again, I think the better driver match would be the Audax I linked to. Combine this driver in parallel (the M & M of the MTM) with inductors (in the crossover) that have a bit of resistance, (smaller guage wire), to not only raise the impeadance of the midrange back up to esotar, but to also decrease the midrange's gain in effeciency down to the esotar.

[ScottG]

An important note:

If you do use the Audax's, do NOT place damping material anywhere near the driver except for possibly a minor amount on the driver's frame and magnet.

FAR preferable would be to use a silicone borscillate paint - both on the driver's frame and magnet and on surface interiors of the box in MULTIPLE coats. (essentially a latex paint with ceramic micro-spheres that absorb sound.)

Here is the additive:

http://www.hytechsales.com/insulatin...additives.html

..you could combine it with any paint, but considering the price and favorable porosity of primer paint, I'd use a latex primer with it.

CAE also makes it as paint called TempCoat, but it costs more and you don't get to vary the concentration of micro-spheres (..more is better up to a point.).

[Jussi]

Hi Scott,

What about general recommendations of SOTA MTM 7" + dome tweeter?

Thanks !

Jussi

[trusound]

I feel that the Audio Technology 18cm C-Quenze driver would be a great match to those esotars...

[Taco]

Originally posted by trusound
I feel that the Audio Technology 18cm C-Quenze driver would be a great match to those esotars...

The Morel Supreme 110 sounds like an Esotar and I did a great sounding loudspeaker with the C-quenze 18H. Also Dynaudio uses polyprop mids...

[Jussi]

What about good matches for Accuton C95?

And how Esotar and Accuton differ? Which one is more transparent? Difference in detail? Possibility of poor implementation in old Kharma?

Thanks!

Jussi

[Landroval]

Have you checked Tony Gee's Soup:
http://www.humblehomemadehifi.com/Soup.html