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Old 13th February 2002, 10:19 AM   #1
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Default High Sensitivity drivers...Where?

Hi there folks,

My first post in an actual 'topic' - be gentle with me!
I wrote something about me in the introduction, and interested are directed to that thread!

Well, to the question:
If I want to build a loudspeaker with a system sensitivity of, lets say, 95dB and keep a fairly high impedance, lets sa >5ohm... Where do I fins driver units for this? Scan Speak, Vifa, Seas and so on does not have anything apealing...

I am hoping for a nice two way solution, preferably D'appolito. The Tweeter is not an issue when it comes to high sensitivity.

The box size and price....well...lets ignore those two aspects for a while...and just discuss the driver units!

And I am not interested in horn loaded constructions...

Awaiting answers and ideas!
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Old 13th February 2002, 10:24 AM   #2
Dirk is offline Dirk  Belgium
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Hi,

You should definitely have a look at the "High Efficiency Speaker Asylum", keeps you busy for hours:

http://64.154.92.195/forums/hug/bbs.html

Regards,
Dirk
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Old 13th February 2002, 04:44 PM   #3
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Look, your project is challenging: hifi systems with REAL 95 db efficiency are not so many, and all belonging to a very specific segment: we can list the Klipsch horns (Klipschorn, La Scala etc.), some BIG Tannoy (GRF memory etc.), plus several DiY projects mainly designed for use with very low power amps (i.e. monotriodes with 2A3). Looking back in the history we can mention Altec, JBL, Electro-Voice; at an impossible level of cost the 'esoteric' japanese projects (Audio Note, Audio Tekne etc.)

And find tweeters with that sensitivity IS a problem, at least conventional dome tweeters.
Good tw have an efficiency around 90 db, some can be defined '92' with some indulgency.
Excluding to multiply the number of units (that normally creates more troubles than it solves) there are 2 options: horn/compression tweeters or the Dr Heil's AMT. The latter is a great unit, but is expensive and very difficult to interface with a bass driver (let's say that all the system I heard, ESS first, always sounds as if the tw is one step ahead of all the rest)

Bass freq : it depends how low you want to go. If you accept a f-3 around 60-80 Hz the 95 db can be achievable reasonably easy, going deeper calls for a price in terms of volume and complexity (need of dedicated bass speaker).
Probably the best solution for a 95 db bass unit is to have a dedicated bandpass enclosure, whose cost and size is mainly defined by the lowest freq you want to reach. But this means a 3 way system.

Well, in summary I believe that your specs (95 db 1w/1m, 2 ways, no horns) are impossible to achieve with the components available on the DiY market, and I honestly believe that if somebody produces a well sounding 95db dome tweeter all the big names would be in queue to buy it!

Why don't step back and accept, say, 90-91 db efficiency?!

bye
sandro
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Old 13th February 2002, 05:19 PM   #4
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Well...

Orca Design has the Raven R1, 95 dB's sensitivity, R3 has 99. And, no, these drivers are NOT cheap! ;-)

What I want, is a seven och eight inch bas/mid which reaches up to, lets say 4000Hz. Impedance (Rdc) > 7ohm. Sensitivity ~94dB per each...mayby 93!

I will check out the above mentioned forum for high sensitivity!

Thank's
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Old 14th February 2002, 06:38 AM   #5
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Hi epkpeng,

The figures quoted for the Audiom A range of speakers (7a2, 12ax, 15ax) are around the 95-96dB level. I can't comment, as I've only heard the old Kevlar and 13 inch Polyglass Audioms (they sounded good, but not for the cost). I think you might find it a bit hard to use these in anything other than a 3-way.

I did see an article posted a couple of years back on a fellow who used an R3, along with 4 Theil & Partner c95t12 units in an MMtMM. It was crossed at around 500Hz (I think). But I think the 12ax might be too big to use in that area of the midrange.
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Old 14th February 2002, 11:40 AM   #6
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Default hey

seriously, how much is the maximum amount you want to spend.... because there are plenty of drivers that have high sensitivity, you could get higher than 95dB that still sound good, if you want really really high sensitivity, for it to sound good and still handle power you will need to spend quite a lot of money, eg, all the studio monitors out there that are over 95dB.

I found a few high sensitivity drivers just off memory...

here is a dome, shallow horn tweeter from Peerless... it is 99dB
http://www.d-s-t.com/peerless/data/811647.htm

a morel tweeter shallow horn 97dB
http://www.gis.net/~morelusa/tweeters/mht-36.htm


also check this out.
http://www.snippets.org/ldsg/sect-7.php3
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Old 14th February 2002, 12:07 PM   #7
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Hi Epkpeng,

didn't knew this Raven ribbon tweeters, they look good but my impression is that their power handling is not that big.
If you plan to use a low power amp is ok, otherwise I fear they must be cut at 5-6 khz to avoid damage.
Maybe in that price range you may look at the 'big' AMT (sold at arond 500 Euro in Italy) who is around 98-100 db and can be x-overed around 1-1.5 khz.

In case you decide for a 3 way system, have a look at Audax PR17 midranges (http://www.e44.com/professi.htm) : they are well famed and does not cost 'an eye + an arm'.
Also their 10" PR240MO seems ok for an acoustic suspension (Q is 0.53) 2 way crossovered at 1.5-2khz

Other ideas you may find looking at the Ciare 'pro' catalogue, it's an Italian brand with an extremely good Q/P ratio (www.ciare.it), they should be distributed in Europe.

bye
sandro

PS Andrew, the tw you mentioned are good (I used the Peerless in several projects) but are horn loaded dome tw, and epkpeng has excluded horns (I suppose for the coloured timbric and narrow dispersion). Audax and (I think) also Vifa has horn loaded domes in catalogue; accepting a horn loaded driver there is plenty of choice...


bye
sandro
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Old 14th February 2002, 01:17 PM   #8
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Hi there,
...and thank's for the answers!



Well...I wrote that money was not an issue...And ment it in a way that "what can we do if we neglegt the cost". Off course there is a roof for what I can pay...but lets say a figure; ~ $3000 for driver units (and XO, cabinet etc).

The tweeters are OK. I think I'll use the Raven R1 or R3 of nesecary! That should do it!

Beyma had som nice units, when it comes to sensitivity. Although, how will those dirvers sound toghether with Raven? Miss match?

Click the image to open in full size.



The 'requirement' conserning 2 way is OK to change - a 3way design is OK, althogh not as desirable as 2-way (due to XO, cabinet etc..).

This one has a driver I could most definetly use! They are sold by Audio Note in Denmark...

Click the image to open in full size.
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Old 14th February 2002, 04:43 PM   #9
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Try Triangle. I've built MTM open baffle design using Triangle T160 and R1 and after 6 years still don't feel the need to change anything. Triangle midranges go very high and they could be actually used without tweeter. Sound beats Accuton and Focal units I used before. Recently I also bought PHL drivers and Raven2 which I try to use for another project. They all have efficiency around 93 dBs. Sourced from Orca or you could try distributor in France.
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Old 18th February 2002, 12:08 PM   #10
dice45 is offline dice45  Germany
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Default Recommendation: Fertin

Per,













you maybe should consider some fullrange chassis. You do no need to use them as fullrange (although biased me would recommend that )













For back-loaded horns consider the different Lowther chassis, they all are above 96db/W/m













For different applications consider Supravox from France but rumours have it their manufacturing quality control is not on the bounce. Anyway, they have quite a variety of differnt high efficiancy speakers.













For open baffle use, vented enclosures, closed enclosures but NOT for horns (diaphragm/VC/centering spider not airtight) consider the Fertin 8" drivers. Fertin has two 8"ers, one with a ferrite magnet rated at 94dB/W/m (FLB20MKII, ~US$600 a pair) and one with a field coil motor (FLB20EX, ~US$1500 a pair) rated at up to 98dB/W/m, depending on the field coil's supply voltage. Both drivers have profiled paper cones and both have a whizzer cone for the treble and a phasing plug, not a dust cap. Both drivers have a positive half roll rubber surround and a relatively high moving mass but the profiled paper cone acts as a mechanical filter so this should be ok.





I was seeking for a good fullrange driver myself (having had a Lowther Acousta for years and loving a fullranger's beauties) which is atleast covering 80Hz to 20kHz properly. I listened to the Fertin field coil thing and bought it at once, feeling that all my wet audio dreams were coming true (maybe w/o the utter low end). This listening at the dealer's place went over 5 hours and no listening fatigue at all, we were totally hooked.





You will not long for a tweeter with this speaker, the upper end is just a dream. In a baffle of 1m width and 1,7m height, you will probably not long for bass either, the bass appears fast and very slender but completely lacks the mud bass reproduction usually is heavily loaded with. But AFAIC, i know what can happen in the low end using a 1st class subwoofer and i want tohave my 20Hz !!!









So, what i am trying to put together at the moment is an open baffle subwoofer (faintly similar to the Linkwitz subwoofer but using a pair of 18" Beymas) and a stand for mounting the Fertin on its motor (too heavy to mount it at the basket only). The baffles will be easily replaceable, i already learned from an open baflle guru that the baffle has atleast as much influence as the driver and i will have to try out many.
The speaker will be bi-amped (AKSA 100W fot the subwoofer and my PP AD1 tube amp design for the Fertin, the amps having the speaker XO built in)








Manufacturing quality for the Fertins is superior, just gorgeous, like Altec in their best days.
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