|15th March 2019, 10:21 PM||#1|
Join Date: Jan 2011
Most efficient fullrange
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
|15th March 2019, 10:28 PM||#2|
Join Date: Nov 2005
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?
|16th March 2019, 12:13 AM||#3|
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).
|16th March 2019, 04:00 AM||#4|
PRV 5MR450-NDY-8 94dB at 2.83V (can handle 225w thermal input)
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
Last edited by xrk971; 16th March 2019 at 04:03 AM.
|18th March 2019, 08:03 AM||#7|
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.
|18th March 2019, 11:28 PM||#8|
Join Date: Jul 2007
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!)"
This edit signature thingy is seriously hard to find
|19th March 2019, 11:26 AM||#9|
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.
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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