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Old 6th March 2012, 10:13 AM   #1
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Default New New Speaker Project

I have decided to scrap my previous build thread, as the design parameters have changed dramatically in the last few weeks. Instead of trying to build a surround sound system, I am now going to build only two main speakers, and instead of going three way, I am now going four way.

I have also decided to up the budget and step it up another notch by going active instead of passive. I have a Ground Sound DCN28 digital crossover coming from Denmark very soon, and this will form the the nucleus for the new mains. My existing Rotel RB-1092 will be joined by 3 new 2 Channel D Class Rotel amps.

Drivers I am still undecided about, and would appreciate some assistance in determining the best combination for a full scale system.

I am leaning towards using the RAAL tweeters with some AudioTechnology or Accuton drivers. Probably more towards the AudioTechnology as the Accuton seem to dop off in the lower frequencies.

Box sizes I am totally open to virtually any reasonable size boxes, and I am thinking more of a 3 + 1 where the super low frequencies are in their own cabinet, and will be driven by the RB-1092 amp.

I want mind blowingly crystal clear sound and super tight low bass, so please suggest away. Being that I am blowing ~$10k on electronics alone, I won't be tryng to skimp on drivers, but I don't want to spend money for the sake of it, so if it is dear and worth it please suggest it, but if it is dear and not worth it please don't.
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Old 6th March 2012, 12:10 PM   #2
Lojzek is offline Lojzek  Croatia
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Quote:
Originally Posted by Silent Screamer View Post
I want mind blowingly crystal clear sound and super tight low bass,
so please suggest away. ...I won't be tryng to skimp on drivers, but
I don't want to spend money for the sake of it, so if it is dear and
worth it please suggest it, but if it is dear and not worth it please
don't.
Hi Silent,

let me suggest one crazy and totally high end system based on
no compromise philosophy. You'll need to build a really big box
in order to perform just about right, considering bass performance .

For the bass driver I'd choose:
http://www.audiotechnology.dk/iz.asp?id=4|a|127|||

For the upper bass-lower midrange:
http://www.audiotechnology.dk/iz.asp?id=4|a|124|||

For midrange get the best dome for the job, DYNAUDIO D52AF
which is really an older product but miles ahead from what nowadays
is offered by some so called high end producers.

You could find a pair of these domes as NOS but probably is going
to take some time to actually find one. There are many second hand
ones in not very good condition or fried and this is exactly what you
should be looking for, a fried one.

These you can get for pretty cheap and then send it back to manufacturer
to provide you with a new pair in exchange for your old one. Since money
is not really an issue, you could easily pay couple of hundreds of dollars for
a new pair.

This is a service they provide for all of their former diy customers. Very
important, don't bother acquiring the premium line of drivers, so called
ESOTAR series because you don't want your money thrown away just
for the sake of a fact that there are people who are not satisfied unless
they pay top dollar for a product. Trust me on this one.

The same holds true for the tweeters. Get a second hand pair of
DYNAUDIO D21/2 and do the same thing just like with D52 AF's.
These are 3/4'' and have a better off axis response compared to larger
domes and are high end as it gets.

All said is strictly to be seen as IMO and not otherwise.

Wish you all the best in finding your own system made in heaven !







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Old 7th March 2012, 05:19 AM   #3
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Thanks for your suggestions Lojzek any particular reason why you would look at the Flexunits 12 B 77 25 10 over the Sandwich cone?

From what I read the Kap would produce a tighter base.

Also wondered if this would be the best driver for the super low base or if there is something better suited Flexunits 15 E 102 25 10
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Old 7th March 2012, 07:05 AM   #4
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Try to get the RAAL 70-20XR amorphous core if you can find it...
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Old 7th March 2012, 07:24 AM   #5
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The RAAL 70-20XR is listed as OEM on the RAAL website RAAL: Products

Any particular reason for choosing it over say the RAAL Lazy Ribbon 9"?
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Old 7th March 2012, 08:13 AM   #6
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Ok just answered my own question as to why not the Lazy Ribbon 9"... I would need a concert hall with 20 drivers to get it to work!

The RAAL 70-20XR is only available to OEM's that are willing to sign an NDA, but the 140-15D looks quite nice with an SPL of 95dB.

Unless anyone has a particular reason why I shouldn't go this way consider the tweeter selected.
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Old 7th March 2012, 10:37 AM   #7
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You can get tighter CTC spacing with the smaller 70-20XR. They are OEM only but I have seen quite a few pop-up on ebay and classifieds.
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Old 7th March 2012, 11:12 AM   #8
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So all things being equal if I can't get the 70-20XR, would I better off getting the 70-10 over the 140-15D?
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Old 7th March 2012, 11:43 AM   #9
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Not sure. RAAL suggests 4th order L-R @ 2800 Hz as the minimum for the 70-10. If thats accurate then it would be fine for a 3-way but you should try and get opinions from those that have used it.

I've only heard the 70-20XR in these speakers.
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Old 7th March 2012, 11:56 AM   #10
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thanks dabbler I was just looking at my local suppliers website at the two different models

RAAL_70-10XR Ribbon Tweeter

RAAL_140-15D Ribbon Tweeter

And there is little difference price wise between them ($1398 vs $1544) other than better CTC if using dual mids, I thnk the frequency response of the 140-15D looks slighly more apealing.

I think I would be hard pressed to go wrong if I bought either model most people who have heard them are very impressed.

They both seem to have that level of clarity I am looking for.

Last edited by Silent Screamer; 7th March 2012 at 11:58 AM.
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