MJK’s Jordan JX92S OB with a Goldwood GW-1858 Woofer in an H Frame - Page 2 - diyAudio
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Old 20th October 2008, 07:33 AM   #11
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BTW, SpeakerWorks has the Goldwood GW1858 for $49 on sale.

-David
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Old 20th October 2008, 08:57 AM   #12
CLS is offline CLS  Taiwan
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For testing cone travel, I recommend that "Steps of T-rex" -- soundtrack of THE movie.

The 8Hz low frequency makes my 18"ers move quite a lot! :LOL:
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Old 20th October 2008, 09:38 AM   #13
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Martin: Thank you for post no. 9.

I think that many here have been waiting for this kind of summary.

It would be great if we could find a Fostex driver that came closer to the Lowthers performance (obvious cost reasons). My FX120eNs are in transit from Dave, would these be good contenders? A Passive XO solution would be very welcome also.

I do not have space for an OB project at the moment, but maybe soon...
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Old 20th October 2008, 10:49 AM   #14
MJK is offline MJK  United States
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Quote:
Originally posted by Godzilla
>>> do you think the Goldwood in the H frames as you designed would work well with BIB's? My feeling is to leave the BIBs playing full out and changing the crossover on the H frames. I was thinking about lowering it to 50hz to 100hz and fiddle with the volume control of a dedicated amp to make it work. Your H frame design will sit nicely in front of my BIBs without obstructing them. The H frames could be moved forward or backwards and side to side for best results. I am excited about your H frame ideas!
I think that both the Goldwood and the Eminence Alpha 15A would provide the bass for your BIB speakers. The trade-off will be size versus bass extension, looks like the price of each is about the same. I have never heard a BIB design so I can't provide much of an opinion but I would recommend putting a crossover on both the BIB and the H frame to make get them to work better together, I am not a big fan of running one driver full range and then using the crossover only on the sub.


Quote:
Originally posted by dublin78
It would be great if we could find a Fostex driver that came closer to the Lowthers performance (obvious cost reasons). My FX120eNs are in transit from Dave, would these be good contenders? A Passive XO solution would be very welcome also.
I am looking hard at the FX120 and the F120A as alternatives to the Jordan, it will be an interesting comparison and I have no idea which of the three will work the best. Unfortunately the FX120 is out of stock at Madisound so I am waiting for them to receive more drivers. Hopefully in the next few months I will make some progress.
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Old 20th October 2008, 11:51 AM   #15
jamikl is offline jamikl  Australia
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Maybe the fostex F200A with 2 X Pyle or Alpha 15s or a single Goldwood would be worth a look. I have not heard this speaker but it has a higher power rating and higher xmax than the other smaller Fostex drivers. It is a bit expensive but nowhere near the cost of Lowthers. Maybe with a rear facing tweeter for "air" or to make up for any falling off of the highs on the 8" unit. Any comment on this combination?
jamikl
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Old 20th October 2008, 11:59 AM   #16
MJK is offline MJK  United States
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Quote:
Originally posted by jamikl
Maybe the fostex F200A with 2 X Pyle or Alpha 15s or a single Goldwood would be worth a look. I have not heard this speaker but it has a higher power rating and higher xmax than the other smaller Fostex drivers. It is a bit expensive but nowhere near the cost of Lowthers. Any comment on this combination?
Once you relieve the full range driver of the bass frequencies the Xmax is not so much of an issue. The F200A is not an inexpensive driver and I am not sure what you would gain over either the F120A or even the FX120. My thinking is to look for a full range driver that does the high frequencies well and not worry about the frequencies below 200 Hz, this would lead me towards looking at smaller drivers that are much less expensive. But that is only my approach based on my "vision", others might follow a different path based on a different set of trade-offs.
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Old 20th October 2008, 12:47 PM   #17
kmaier is offline kmaier  United States
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Martin,

I have had both the FX120 and F120A for quite some time and have listened to both extensively. These drivers share much in common from a materials point... i.e., the die-cast frame, spider, cone, dust cover and surround. The cone looks different from the front but looks the same from the rear. The surround also looks slightly different but it's unclear if the difference is purely for aesthetics... the cone color seems to be about it. The major difference lies in the magnet structure, ceramic versus Alnico and the fact that the F120A is from their Laboratory Series and still made in Japan while the FX120 is made in China.

From a comparison for listening, the F120A is the winner and by a good margin. They provide much better detail and low-level information that just gets lost with the FX120. High-frequency content, like the sizzle on cymbals, are excellent on the F120A while the FX120 simply doesn't deliver here. I also found the F120A has better tolerance, as my FX120 pair is off by ~1 dB in output level and the F120A pair is spot on. IMHO, they are worth the 2x price based on the performance improvement alone. I actually bought an extra pair of these after swapping from the FX120.

I also am interested in pairing up the F120A with a pair of H-frame subs at some point. I'm leaning towards a 15-inch, but still have a mental block on such a cheap driver paired up with the F120A. I'd actually like to mate it with another Fostex driver but that seems unlikely. Hope this POV is helpful.

Regards, KM
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Old 20th October 2008, 01:24 PM   #18
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Quote:
Originally posted by MJK
The more expensive IB or OB 15" drivers will have a much larger Xmax compared to the cheaper versions. But my experience is that with music, even played at loud volume levels, the cone's barely move. I did subject my Goldwood H frame to the 1812 overture this past week. I played it through twice, once to listen and once to watch the cone motion. My 16 year old son was laughing telling my how cool it was when the floor shook. Watching the cone, at a fairly high volume level produced by a 200 W SS amp, I estimate they moved about 1/2" peak to peak. No damage and no bottoming of the voice coil. Would a more expensive driver have done a better job, maybe but this is not something I do on a daily basis so I am not really interested. For music, I have not experienced any problems where the cone motion approachs the stated Xmax of the cheaper drivers.

I
See how we're rediscovering that the 'short throw' approach of vintage drivers was better then and is better now. 'Conventional' drivers and systems boast high xmax and often high mms drivers that move alot of air but create more distortion and seem to do a poor job of reproducing basslines accurately. So maybe the tradeoff is larger surface area for big drivers and consequently big speaker systems. That's perfectly fine to me.
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I must confess my favorite music is that made by the Rolls Royce Merlin.
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Old 20th October 2008, 02:13 PM   #19
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Kmaier: Thank you for your input. I have heard similar tales of FX120 vs F120A.

I am hoping that Dave's eN modifications will close the gap somewhat, and provide similar improvements that have been reported between the FE127 and FE127eN.
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Old 20th October 2008, 06:49 PM   #20
kmaier is offline kmaier  United States
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Dublin,

Yes, I've been somewhat vocal about the comparison for well over a year now and had some other posts here and audiocircle to the same. Others have also noted the same results from comparison tests. Granted, the F120A is more than twice the price of the FX120, but having direct experience with both, I would not choose the FX120 unless financial constraints forced me otherwise.

Jim Rebman has a pair of F120A that were enabled by Bud and were used for the Fonkensteen design and final tuning... unfortunately I'm not sure anyone has done adequate listening in a proper enclosure to accurately describe the difference (stock vs enabled)... (Bud, Chris, et al please jump in here if I'm in error). I've not heard the enabled pair so I can't comment on the difference.

Regards, KM
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