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Old 15th March 2019, 10:21 PM   #1
Kashtan is offline Kashtan  Ukraine
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Default Most efficient fullrange

Voxativ
AC-XHB 98 dB (60Hz) / 110dB (4 kHz) 1W / 1m
AC-X2 96 dB (60Hz) / 102dB (4 kHz) 1W / 1m
AC-X 95 dB (60Hz) / 101dB (4 kHz) 1W / 1m
AC-4Ф Silver 96 dB (60Hz) / 105dB (5 kHz) 1W / 1m*
AC-4Ф Gold 97 dB (60Hz) / 106dB (5 kHz) 1W / 1m*
AC-4a 96 dB (60Hz) / 101dB (3 kHz) 1W / 1m*
AC-4x 96 dB (60Hz) / 101dB (3 kHz) 1W / 1m*
AC-PiNd 93 dB (60Hz) / 98dB (3 kHz) 1W / 1m*
AC-2.6 93 dB (60Hz) / 98dB (3 kHz) 1W / 1m*
AC-PiFe 94 dB (60Hz) / 100dB (3 kHz) 1W / 1m*
AC-1.6 94 dB (60Hz) / 100dB (3 kHz) 1W / 1m*
AF–2.6 94 dB (60Hz) / 99 dB (3 kHz) 1W / 1m*


philips ad1255 98db

Lowther PM4 98 db
PM5 98 db
EX4 99 db
EX3 98 db

Fostex FE208EΣ 97 dB
Special FE208-SOL 96 db
Nirvana Super 8 NEODYMIUM 100 db
Nirvana Classic 8 NEODYMIUM 100 db

altec 755c 96 db

Supravox 215 GMF 40W / 97dB /

ELECTRO MAGNET SPEAKER LB12EX 97.8 dB
ELECTRO MAGNET SPEAKER LB12MKII 97.5 dB

Any else?
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Old 15th March 2019, 10:28 PM   #2
SubSoniks is offline SubSoniks  Wales
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Fane 12-250tc, Fane 15-300tc both efficient and play to 16KHz+

Fane also post frequency response charts unlike the $59,000 driver? would like to see some detailed info on that one, is it really much better than a hundred dollar Fane?

Last edited by SubSoniks; 15th March 2019 at 10:36 PM. Reason: $59,000?
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Old 16th March 2019, 12:13 AM   #3
planet10 is offline planet10  Canada
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Most efficient fullrange
You need to know the FR and where the sensitivity or efficiency lies. SOme of these drivers have over a 10 dB (or more) lift over their bandwidth and if the number is pulled off at a higher frequency so is actually much more optimistic than in real life.

Also, some of those highly sensitive drivers have a very low Q to get tat hi efficiency, and it becomes very hard to get any real bass extention.

Take the FE206 for instance. Not a slow a Q and you can get good bass out of a (big) hornenclosure to lift the LF up to meet the HF, but if the Q gets too low you also need a front horn — or heavy EQ as Martin did with his Lowther ML-TLs (ended up 90 dB for a 99 dB (or something like that)).

Also you have to know whether they are properly quoting efficiency (1w/1m) or sensitivity (2.83v/1m). The wrong units are all too often used.

The Visaton B200 is properly rated at 2.83v/1w but the 96 dB is some 5-6 dB optimistic because of the rising top end. This is mostly fixed by phase plugs, but one will find lots of talk about use of filters (a band-aid that doesn’t really fix the problem, only the pain).

dave
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Old 16th March 2019, 04:00 AM   #4
xrk971 is offline xrk971  United States
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Most efficient fullrange
PRV 5MR450-NDY-8 94dB at 2.83V (can handle 225w thermal input)

https://www.parts-express.com/pedocs...ifications.pdf

If you put them in parallel you would get +6dB and 4ohm nominal load for 100dB at 2.83v.

Thread discussing use and sound:

PRV 5MR450-NDY for FAST/WAW applications
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Last edited by xrk971; 16th March 2019 at 04:03 AM.
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Old 16th March 2019, 05:21 PM   #5
SubSoniks is offline SubSoniks  Wales
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Some squigles off of speakerplans.

FANE 12-250tc FULL RANGERS - Speakerplans.com Forums - Page 4
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Old 18th March 2019, 07:04 AM   #6
talaerts is offline talaerts  Belgium
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Ski slope f curves make comparison difficult.
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Old 18th March 2019, 08:03 AM   #7
KaffiMann is offline KaffiMann  Norway
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Most efficient fullrange
talaerts, indeed, the different frequency response charts are hard to compare. But at least having a properly measured response gives you some form of information, on which one can form an opinion.
IMO spending thousands of $ on a single driver, with no data to support the decision, seems a bit weird to me.
But maybe it's for other people than me, that can afford to spend that much on a whim.
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Old 18th March 2019, 11:28 PM   #8
hollowboy is offline hollowboy  Australia
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Quote:
Originally Posted by KaffiMann View Post
talaerts, indeed, the different frequency response charts are hard to compare. But at least having a properly measured response gives you some form of information
If you plug the Fs, Vas and Qes into a calculator, you'll get a reality-based answer, that makes different drivers easy to compare. Put every known driver into a spreadsheet, order it, and you'll find your winner.
HiFi Loudspeaker Design

As a rough guide:
Driver X advertised number = 94dB
X 'real' calculated efficiency = 91dB

Like any calculation based on TS calculations, this hypothetical 91dB will only be accurate for the small signal response near Fs (that is: what dave and talaerts say about uneven FR plots does apply).

...but if you listen off axis and/or if you EQ for ~flat response, this hypothetical 91dB is what your final system sensitivity will actually be - at best*. If you include baffle step compensation, you'll lose more.

That is: after EQ for flat response to ~Fs, driver X gets you about 88dB, not the advertised 94dB.

*the exception being if you use a front horn AND get it just right, so the horn boost blends seamlessly with the driver's rising response. As far as I know, none of the systems using larger FR drivers do get it just right, no matter how much they cost / brag.

e.g Martin Seddon seems to be a good guy who publishes real info. If you look at his (mislabeled) FR plot for a $$ Lowther in a front horn, you'll see it has a ~10dB hole centred at 1kHz .
Azurahorn -Le Cleac'h Acoustic Horns - Products

I've never seen a published FR plot for Oris and similar horns, but I assume they are pretty similar to the Azura; if they were better, they'd flaunt it.

I do not believe this claim: "Extraordinary sensitivity (up to 114dB!)"
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Old 19th March 2019, 11:26 AM   #9
KaffiMann is offline KaffiMann  Norway
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Most efficient fullrange
Craig, yes of course theres the TS parameters to calculate relative sensitivity, but that does not help much on the higher part of the frequency spectrum. And the lack of 3rd party measurements of things like the AER drivers, and seemingly no off axis plots, makes me somewhat cautious about all of them.

But it's really hard to say anything really, it would be empty opinions all over.
Who knows? Maybe all these things are magical and have flat response from 0-60 degrees?

I'd really like to listen to one though. Same for those fancy horns, not willing to sell my internal organs for them, but would be fun to get a real life impression with my own music selection.

Edit:
I am at the very least very happy that the 15-300TC where so cheap.

Last edited by KaffiMann; 19th March 2019 at 11:31 AM.
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Old 19th March 2019, 06:05 PM   #10
inrank is offline inrank  United Kingdom
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My Supravox 165-2000 I measured at 95.8dB/1w/1m (99dB@2.83v) with the Dayton DATS.
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