Comments on 2xPeerless HDS205, ATC Sm 75 and Hiquphon OW II very welcome

[leifislive]

Hi,

I have big plans and limitied budget on this project and would like to seek your advice for final judgement.

The plan is: 3 way digital with the ATC midrange... sounds like a similar post....
Plan includes: build costefective at first and then upgrade what needs to be done, therefore: the ATC is an out of question cost factor...


So far, for the woofer I will most likely use two Peerless hds 205 per box in CC, linearized to something like -3dB at 30Hz. Looks like the best bang for 300 Euros ...
Is this going to get your approval?

Mid is obviously clear...

Highs are sort of a dilemma, as you can tell, and I can tell from more and more reading all the posts in that forum.

However, I would prefer to keep the costs in a first, yet acceptable, version for the tweeter to around max. 300 Euro for a pair.
I do presently own a Vifa XT 25 and would prefer to have a little bit more detailed sounding tweeter for this project.

I could probably copy ATC and use a Vifa dome...
or I could take advance of those, who sell matched pairs: Morel and Hiquphon...
or I gould go for the "standard" Excels (not the millenium) or Scanspeaks (9700...)...
or may be the Accuton/Thiel...

Big question is: will 19mm do it? I won't listen to music exceeding 90dB in my room, but I don't want to cross significantly higher than 3k in order to have a good dispersion in the room (both vertical and horizontal)

I consider it to be possible (there are kits that cross the HQphon at 2.2, however they recommend at least 2.5...) concerning distortion, do you agree?


Thanks for any help and comments, I'll appreciate it very much,

regards

Leif

[LaMa]

First of all, I think that if you use a ATC mid dome you can incorporate a 19mm in your design. In that case cross >4kHz because a dome mid doesn't beam as much as a conventional cone speaker.

The peerless HDS woofer at first seems the right choice, however the cone is made from several layers of polypropyleen. This material doesn't give the ' slamm' and drive in the bass.
It's better to use a driver which is made of stiff cone material, e.g. alu, kevlar, HDA or ceramic. In your budget the 20 cm alu from seas seems to be an appropiate candidate. If sensitivity needs to be higher a focal polyglass or better a polykevlar is a better choice.

I would go for one focal 11k instead of 2 HDS205 drivers.

edit: but in that case the ATC mid dome has to be crossed around 300 Hz, I don't know if it is possible.

[leifislive]

Hi,

thanks for your answer. I am glad to hear you agree on a 19mm, 4k would need to be discussed in detail and mostlikely tried...
I have considered the Seas Alu, yet they have rather low efficiency and a lot of more distortion, whether that will be an improvement... I don't know. A friend of mine, an engineer, diesn't like alu, simple because there is not benefit in mass stiffness relation compared to kevlar or alike.

11 K and all the focals are rather high distortion drivers as far as I know, which all may sound quite "slammy", but if I can get something "closer to original" sounding, I would prefer it.

however, those Audax HDA are worth to be thougth about, however I don't know, whether they implement as much of those anti distortion features as peerless does. Do you have some knowledge of their distortion at 50 Hz?

This friend of mine is building something alike using the Eton 8 inches, Morel MDM 55 and the Hiquphon, basically nice, but twice as much for the bass comparred to peerless.

BTW Klein and Hummel use the HDS 205 in their 0300 monitor.

do you really think, the peerless sandwich is so bad not to be tried?

regards

leif

ATC cross at more than 400

[Ghianni]

Hi,

Perhaps my question is out and late to the topic but I am asking you if you know the make and type of Klein and Hummel O98 woofer as I ask there: Woofers replacement.

Thanks

[badman]

Originally posted by leifislive
Hi,

thanks for your answer. I am glad to hear you agree on a 19mm, 4k would need to be discussed in detail and mostlikely tried...
I have considered the Seas Alu, yet they have rather low efficiency and a lot of more distortion, whether that will be an improvement... I don't know. A friend of mine, an engineer, diesn't like alu, simple because there is not benefit in mass stiffness relation compared to kevlar or alike.

11 K and all the focals are rather high distortion drivers as far as I know, which all may sound quite "slammy", but if I can get something "closer to original" sounding, I would prefer it.

however, those Audax HDA are worth to be thougth about, however I don't know, whether they implement as much of those anti distortion features as peerless does. Do you have some knowledge of their distortion at 50 Hz?

This friend of mine is building something alike using the Eton 8 inches, Morel MDM 55 and the Hiquphon, basically nice, but twice as much for the bass comparred to peerless.

BTW Klein and Hummel use the HDS 205 in their 0300 monitor.

do you really think, the peerless sandwich is so bad not to be tried?

regards

leif

ATC cross at more than 400

Well! Tell your engineer buddy THIS! Just kidding) Aluminum has another advantage- most often (when I've seen it) it's used with aluminum formers, so you get effectively the whole cone area as a voice coil heatsink. I believe that thermal artifacts set in at fairly modest heat levels, and this helps keep a lot of headroom in the speaker (the heatsink effect)

[leifislive]

Hi,

how funny, I have already forgotten the thread....

I am now using 2 Eton as described before along with the dynaudio 76mm dome and the peerless wa10.

crossing is something about 400k and 2200k and depends on the day and what I try...

can complain so far... and much cheaper then atc domes.

with reagards to the thermal thing, that sounds logical.

Best

lefi