Make sure you buy a good one that has a ball bearing supported motor. I burned up two bushing style jigsaws before buying my Dewalt industiral model with 6.5 amp ball bearing motor.
Rgs, JLH
Is the Fane 8m good for around 100hz to around 800hz?
I am looking at the datasheet
Fane Studio 8M - Audio Voice Acoustics
and it appears that the graph is a bit choppy from 500hz to 1000hz
I am looking at the datasheet
Fane Studio 8M - Audio Voice Acoustics
and it appears that the graph is a bit choppy from 500hz to 1000hz
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Raw frequency response measurements during T/S parameter testing rarely ever translates into anything useful once the woofer has been horn loaded.
Didn´t see "without"😱.
Something wrong with the T/S in Fanes data sheet, though. Using the original equations(not Hornresp) one adds up with Qes=0,25 using all the others from the datasheet(Sd=215cm3 added).
Something wrong with the T/S in Fanes data sheet, though. Using the original equations(not Hornresp) one adds up with Qes=0,25 using all the others from the datasheet(Sd=215cm3 added).
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Fane
JLH, do you think the Fane has an advantage in working well at low levels , compared to some other drivers ?
I've been finding the B&C 8PS21 was best on a simluation ( for my 120-700 Horn ) , but the Fane is close, although doesn't go quite as low . But... if it goes 10-20Hz lower than expected, then I might jump into Rakesh's early-order group because £225/pr is very attractive .
JLH, do you think the Fane has an advantage in working well at low levels , compared to some other drivers ?
I've been finding the B&C 8PS21 was best on a simluation ( for my 120-700 Horn ) , but the Fane is close, although doesn't go quite as low . But... if it goes 10-20Hz lower than expected, then I might jump into Rakesh's early-order group because £225/pr is very attractive .
this is my dilemma too, i was looking into 8PE21 which has a higher Ms than 8PS21 unfortunately (around 90 vs 70hz) while OTOH has +4db better sensitivity, 5g lighter cone and stronger magnet. i find it even better candidate for horn loading, however it doesn't look i can reach desired 80hz in the midbass horn (it should optimally work at 80-300 or 80-400 range)
on top in comparison with fane driver, B&C 8PE21 is so much cheaper, 162e delivered to me vs 300 pounds for fane...8PS21 is even cheaper...
one of the reasons why fane is so good is extraordinary magnet, look at it - the only way to cope with such a heavy membrane
JLH, do you know if there's any difference between two existing fane 8m models - one with a bigger and one with a smaller dustcap? is it only cosmetic or....? the one whose pic is on the actual factory datasheet papers is the one with a bigger....
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two different fane 8m - look at the dustcaps (i was wrong, the smaller dustcap is on a factory paper):
any thoughts?
An externally hosted image should be here but it was not working when we last tested it.
any thoughts?
actually here are the better pics of a small dustcap version
eBay Österreich: FANE Studio 8M - Highend Mitteltöner 103 dB/W (Artikel 280658477522 endet 13.04.11 19:57:44 MESZ)
eBay Österreich: FANE Studio 8M - Highend Mitteltöner 103 dB/W (Artikel 280658477522 endet 13.04.11 19:57:44 MESZ)
The 8PS21's slight underdamped behavior does extend the lower frequencies a little bit. However, the Fane still walks all over the B&C driver in sensitivty and dynamics. I would trade away 5Hz to 10Hz on the bottom any day of the week to get the Fane's tone, sensitivty and dynamics.
Rgs, JLH
Cheers JLH
I will get my order in there today & do a bit more tweaking on the horn to make sure it's optimised for the Fane.
MJ
I will get my order in there today & do a bit more tweaking on the horn to make sure it's optimised for the Fane.
MJ
JLH,
Would you mind sharing the frequency response measurement? The good HF response probably is due to direct radiation. Maybe the shape of the dome/dustcap?
Would you mind sharing the frequency response measurement? The good HF response probably is due to direct radiation. Maybe the shape of the dome/dustcap?
I don't have the frequency plot anymore, lost on old dead computer. The good HF was a combination of driver parameters and the narrowing directivity of the tractrix horn. On axis it was good to 5KHz. Off axis it would start to fall at around 2KHz.
Rgs, JLH
I was looking for a Word document on my various different USB flash drives and ended up finding these two bits of information on the Fane Studio 8M. The T/S parameters given by Fane are more different than I remember them being. I should stress the point this is only a single data point and there could be some variability from sample to sample. The graph pretty much explains why the 8M is good up to around 5KHz on a tractrix horn. Its high frequency efficiency continues to climb all the way to 3.5KHz. No other woofer I know of does this. The peak sensitivity is 103dB 1W/1M and with the narrowing directivity of the tractrix we end up at about 109dB horn loaded. The lower frequencies experience horn gain and result in a fairly flat overall frequency response. I don’t have my measurements from them horn loaded, but remember it was within +/-2dB from 135Hz to 5KHz in a 142Hz tractrix with the rear chamber volume adjust for a resonance of 130Hz. That’s all the information I have for you guys.
Rgs, JLH
Rgs, JLH
Attachments
Excellent info JLH . I will run that data for comparison in the sims that I'm doing.
How close to a full mouth do you have on the 142Hz ? - I have a model of yours which I can refine . Do you find the 135Hz lower-end on this blends OK to the Tapped horn, as both have some phase/group delay issues in the overlap ?
The 109dB is great as it means my three valve ('tube')-driven units will be within 1-2dB on paper - can handle the level-matching with smalll series resitors on the speaker-side.
MJ
How close to a full mouth do you have on the 142Hz ? - I have a model of yours which I can refine . Do you find the 135Hz lower-end on this blends OK to the Tapped horn, as both have some phase/group delay issues in the overlap ?
The 109dB is great as it means my three valve ('tube')-driven units will be within 1-2dB on paper - can handle the level-matching with smalll series resitors on the speaker-side.
MJ
It was a full size 142Hz tractrix - full size mouth. No problems with blending with tapped horn because of the very long wavelengths involved. 130Hz is over 8.5 feet long. Phase alignment was fine, no need to time align voice coils or use digital time delay.
Rgs, JLH
john what is a realistic LF reach for 8M in such a horn, or bigger. i'm wondering can it reach 80-90 hz with no more than a -3db roll? cause i intend to run it on a limited band, say 80-100 to 300-500 (depending on other things) and i'm more concerned with a LF output....
Nice
WoW, those parameters are really different - but good !
I can see why you like it ( attached ) .
Goes a bit lower but with more ripple on my Hyperbolic (design). Probably the best set of parameters I've used for my requirements .
Let's hope Rakesh can get enough orders .....
WoW, those parameters are really different - but good !
I can see why you like it ( attached ) .
Goes a bit lower but with more ripple on my Hyperbolic (design). Probably the best set of parameters I've used for my requirements .
Let's hope Rakesh can get enough orders .....
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