Hi @johnvb
Have you had a chance to listen to your AVPLAY FAST-15 ?
Just curious since the price is good
Thanks
Eric
I think I’ve explored just about every aspect of my 15inch Hawthornes. I’ve come to the conclusion that they are ok for simple music. Trio’s, Quartets, vocals, single instruments. But as soon as the music gets more complex no matter the genre it’s game over.
If I was to do this again, I’d not use anything bigger than 12inch. But that’s just my simple opinion and I’m not too bright or technical in these areas.
If I was to do this again, I’d not use anything bigger than 12inch. But that’s just my simple opinion and I’m not too bright or technical in these areas.
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This was discussed a while ago on several FB groups: You have two Lii spaeker companies. The original is an artisan speaker builder active since decades in China that only sells in China (and is not interested in the rest of the world). He has a strong reputation and should build high quality driver (but i never had one in my hand).
Lii Song that is sold outside is an other guy, who once tried to set up an export for the original (but that guy was not really interested) so he started to copy the original for outside china. That is what you buy here. The few i had in my hands a few years ago where far of spec and not very usable. But they have a cult following it seems. I would never use them. If you want the originals, you will have to go to china and find that original Lii guy.
Lii Song that is sold outside is an other guy, who once tried to set up an export for the original (but that guy was not really interested) so he started to copy the original for outside china. That is what you buy here. The few i had in my hands a few years ago where far of spec and not very usable. But they have a cult following it seems. I would never use them. If you want the originals, you will have to go to china and find that original Lii guy.
Yes. I ran them for about 8 months in a small test baffle, first without wings, then with 6" added wings in the back. Without any filtering other than the treble and bass controls on the Node streamer I was using. Sounded good enough off axis that I was in no hurry to finish up the more permanent baffles that I am building. I did find with the temporary baffles that in my room, the usual barrel baffle that you see used with most of these, would of placed the sound field too low.
At one time I thought the drivers were malfunctioning, the coils would rub every now and again (even with no filtering). Had me worried in that I knew these weren't going to be shipped back to China (I live on the East coast of the USA), too much trouble. Once I took the subsonics out of the signal to them, that went away. I feel the top end is lacking also, so the finished product I am building will be a FAST setup, with the Fast -15 as a mid bass, one or two Eminence Beta 15s for the bass, and a Heil AMT on top. The crossover point from the Lii to the Heils are yet to be determined. Using a MiniDSP SHD Studio and separate DACs / amps to control. These speakers are in a 12' x 15' room, for a single seated listening spot, with lots of QRDs and poly diffusion on the front wall.
Speakers I had in this room before, were highly modified Magnepan MMGs, and then KEF LS50s (the latter which are now in another system).
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Nice... I orginally was going for a taller baffle with a built in Heil:
https://imagizer.imageshack.com/img923/2843/C4biqs.jpg
Now chopped it down so that the Heil can sit on top of the baffle like yours:
https://imagizer.imageshack.com/img922/8924/W1QSkS.jpg
https://imagizer.imageshack.com/img923/2843/C4biqs.jpg
Now chopped it down so that the Heil can sit on top of the baffle like yours:
https://imagizer.imageshack.com/img922/8924/W1QSkS.jpg
I’ve just purchased a pair of the most recent Fast-15 without the whizzer cone. They are from Taobao. I bought them locally for an excellent price so I figured I’ll see what Lii Audio is all about.
I just ordered a pair of Chrystal 6 alnico drivers from AliExpress. Been eyeing them for months and had a weak moment yesterday.
These are not Lii Song but Lii Audio, the ones with the flower logo on the cone. I guess that is the original then? That wasn't the reason I bought them though. I really like the t/s parameters. They even claim to use silver VC wire....and the impedance graph looks amazing (if real 😆) planning to cross them around 400 or 500hz first order to a woofer.
Nominal impedance Z: 8 Ohm
Power：25-50W
Fs: 56.47 Hz
Sd: 14.103 dm²
Qms: 7.583
Qes: 0.324
Qts: 0.311
Vas: 36.36 litres
Magnet：N42（NdFeB）
Mean Sound Pressure Level: 95.1dB （1w/1m）
n0 = (9.7822 * 10-10 * Vas * Fs3) / Qes = 0.0198
SPL @ 1W/1m = 112.2 + 10 * log(n0) = 95.1667
The specs match up, so while yours measured specs can be off, if they sum to ~ the 95.1 spec it should sim/perform as published up to its upper mass corner (Fhm):[/FONT][/SIZE]
Fhm = 2*Fs/Qts'
Fs: Fhm*Qts'/2
Qts': 2*Fs/Fhm
(Qts'): (Qts) + any added series resistance (Rs)
That said, with a ~363 Hz Fhm it's a moot point with a 400-500 Hz XO point, but with no Vc diameter nor inductance (Le) specs, no way to tell what sort of mids, HF response it might have.
Power：25-50W
Fs: 56.47 Hz
Sd: 14.103 dm²
Qms: 7.583
Qes: 0.324
Qts: 0.311
Vas: 36.36 litres
Magnet：N42（NdFeB）
Mean Sound Pressure Level: 95.1dB （1w/1m）
n0 = (9.7822 * 10-10 * Vas * Fs3) / Qes = 0.0198
SPL @ 1W/1m = 112.2 + 10 * log(n0) = 95.1667
The specs match up, so while yours measured specs can be off, if they sum to ~ the 95.1 spec it should sim/perform as published up to its upper mass corner (Fhm):[/FONT][/SIZE]
Fhm = 2*Fs/Qts'
Fs: Fhm*Qts'/2
Qts': 2*Fs/Fhm
(Qts'): (Qts) + any added series resistance (Rs)
That said, with a ~363 Hz Fhm it's a moot point with a 400-500 Hz XO point, but with no Vc diameter nor inductance (Le) specs, no way to tell what sort of mids, HF response it might have.
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OK, thanks! I highlighted your 'Chrystal 6 alnico drivers' and it's what google gave me........regardless, you have the math to check yours, so not a complete waste of time. 😉
Me neither, failed algebra, physics, only graduating on my art skills that I didn't pursue beyond DIY projects, though over time and with others online, locally helping can (most times) decode the math enough to input my ancient TI-36X PRO calculator that makes me appear 'smart'.
Yes and 10-10 = 10^-10, Fs3 = Fs^3.
Yes and 10-10 = 10^-10, Fs3 = Fs^3.
An early case of artificial intelligence. I am even more of a Luddite and don't have a fancy calculator or the skills to use one. What happens if you input these parameters in your AI device? Do they appear to add up correctly?
Revc=7.200 Ohm
Fo=65.102hz
Sd=14.103m
BI=5.828T
Qms=3.7488
Qes=0.530
Qts=0.464
No=1.392%
SPLo=94.3dB
Vas=27.638M
Cms=978.576u M/N
Mms=6.107g
Mmd=5.144g
I read the ad on Amazon about one of these drivers. The more that I read, the more insulting that it sounded. To place an ad in an English speaking country, I would expect that most all of it would make sense to the intended audience. If you, the seller do not know how to tell me accurately about your product, then why would I buy it? Some of this is obviously made up as we go along. Best of all, this particular link will not give a price so that you are pulled into their store. Cheap marketing makes me wary.