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-   -   Thoughts on the F120A or FE108ES2? (http://www.diyaudio.com/forums/full-range/63811-thoughts-f120a-fe108es2.html)

one1speed 6th September 2005 03:37 PM

Thoughts on the F120A or FE108ES2?
 
I was looking around on the web and am wondering about these two drivers. As you probably know, I currently have the 168E Sigmas, which seem to be really nice. But, I do like to be impressed with new drivers from time to time.

Low end isn't really a concern with my future plans, so I'm just wondering if anyone has heard these drivers and what they think of them. Also, if you have any comparative thoughts to the 168, 108 or similar, I'd appreciate it.

Thanks much!

one1speed 7th September 2005 03:55 PM

No thoughs on these drivers? I had hoped to get some response, even if it's just forecasting.

Both drivers appear to have very substantial magnets, with the F120A being a bit of an older design, and the 108ES2 being newer. The curve for the 120 appears very smooth, while the 108 is a bit more choppy. I'm wondering which may be smoother (I'd guess the 120 with the Alnico) and which may reproduce more detail. Also, will one offer more upper frequencies than the other? I'd imagine the mids on both would be wonderful, to say the least.

If you have any thoughts to share, I'd love to hear them. Thanks much!

sumacSK 7th September 2005 09:31 PM

Hi,

I've heard only the best about both (but also that f120A will need helper tweeter), but I would'nt expect them sound MUCH different from your fe168ez...(especially the FE108ES2) Maybe you can look at something like Visaton B200-price is lower and from what I have read it seems to be better than F200A...

Good luck Martin

Josephjcole 8th September 2005 12:01 AM

Layne,
Both of these drivers are pretty high end. I doubt you will find somebody who has heard both, much less somebody who has spent a lot of time with both to give you a reasonable comparison. Where are you finding info on the new 108es2?
Obviously since I haven't heard either driver or even seen the specs for the 108es2 take my advice with a grain of salt. However the f120a is a fairly low effeciency driver (if memeory serves) most of the fostex "special" models add a larger magnet which would lower the Q and slightly raise effeciency (assuming everything else is similar). If you are looking to build a 2-way I would think the 108es2 would be my choice (assuming my mirad of assumptions are correct). My two way with the regular 108 if fairly ineffecient all thing considered. A lower Q would probably lead to more detail/resolution along with the possibility of more dynamics due to higher effeciency. All this would work quite well with a low Q pro woofer.
Joe

one1speed 8th September 2005 02:06 AM

Joe

I thought I might hear from you. Eifl Japan has the 108ES2 listed in their site. It's a pricey little beast, but could be worth the effort. I know you speak highly of the 108 in your system, so I thought this could be fun to play around with. Actually, I've read a lot of good things about the 108. And since I'm not worried about low end, it could make for an interesting design.

I'm hoping to be able to build the woofer portion of the cab on it's own, so I can try different drivers above, as I've got a couple nice ones to try. I'd imagine the simple crossover would work for any of the drivers, (no guarantee though) so it could make for an easy switch between cabs. Or, I may go with OB for the full ranger to open things up. We'll see, it'll take some experimentation. And time, which I don't have right now.

I still have to get through your email, thanks for sharing your thoughts.

Layne

robertG 8th September 2005 09:49 PM

FE168EZ vs FE108EZ
 
Well I had both, sold the 168 and kept the 108.
The difference in low-end is negligible, but the mids and highs of the 108EZ are much better.

Jaime 9th September 2005 02:34 AM

FE108ESII is a high class horn driver and never was exported from Japan.
F120A is not a horn driver.

I have a FE108EZ hornm and I like very much, but in very complex music it is not very satisfactory.

For that reason I buy a pair of FE168EZ recently. They have more power ( 80w versus 24w) and sensitivity (94dB versus 90dB).

Will be the solution?
Best regards Jaime

Jaime 9th September 2005 02:41 AM

The solution will be horn subwoofer?
But they are so voluminous...!!!!
Somebody has another idea?
Jaime

robertG 9th September 2005 12:28 PM

Strange!
 
Jaime,
I don't know if the answer is in a horn "subwoofer" because a horn subwoofer does not exist. I mean a horn that will go below 20Hz.

From my experience, both 108 and 168 are not satisfactory with complex music, and I think that the explanation is in the design of the driver.

Don't get me wrong, these are very well designed, problem is they both have no excursion capability, so when they try to reproduce large amplitude signals (bass) along with a multitude of mid and high frequency information, the mids and highs are modulated by the excursion of the driver, as the driver is unloaded by the horn below cut-off freq.

I am thinking of high-passing the 108 at in-between 60 Hz and 100Hz (for a start), so signal that require some excursion won't reach the driver. The 108 horn (as well as the 168) are really designed to provide low mids reinforcement with an upper cut-off around 300 or 400 Hz.

The low frequency content (from 40Hz to 80 or so) will be fed to a pair of 15 in. pro-drivers in bandpass-horn hybrids (adjusted for sensitivity match), and everything below 40Hz will just be removed by a brickwall filter (there is nothing below that frequency in acoustic music anyway).

I do not know if this will work, but I will surely report back!

Josephjcole 9th September 2005 05:44 PM

Re: Strange!
 
Quote:

Originally posted by robertG

I do not know if this will work, but I will surely report back!

Please do! I've had pretty good luck with my 108 in a seal enclosure crossed over at 300Hz. I would be interested in hearing how the two horns integrate. The 108 is a great driver, but is certainly pushed to do the "fullrange" thing.
Joe


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