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Jeffrey Jackson wrote:

so a few things... one, there is a pair of Goto 370 on eBay and pictures of insides... the newer ones are made the same, but it seems that the execution has gotten a better/cleaner compared to these.. my diaphragms look smoother and the glue seems to be neater... I may be able to dig the pictures out of an old email if needed... I lost a lot in a drive crash a few months back... my fault for not regularly backing up...

Yes, thank for point out. The driver looks like OK, though the price is slightly higher than a new pair of Goto 370

http://www.eifl.co.jp/index/goto/goto.htm

If someone would like to give Goto a try then here is an opportunity for you with $3K admission ticket. It I had this option in 2001-2002, when I was going through the drivers, I would most like to try it…

Jeffrey Jackson wrote:

field coils.. well, though I do also hear that you improve some areas and worsen others when varying voltage and therefore Qes, field coils and permanent magnets aren't different with regards to how they react to frequency... you certainly may find a permanent magnet driver that you like across the full band of the horn, but it isn't really due to the permanent magnet... as with all drivers, the magnet is just one of many variables.. I think the horn should be built to compliment the driver, whether field coil or not, just like any driver.. and maybe view the field coil as a bonus that will allow fine tuning once in place.. I do hear some things about field coils that I don't hear in permanent magnets.. but it is hard to say that it is directly due to field coils... I think, in general, they do sound a little smoother.. less grain... but this isn't a proclamation of "field coils are best" because I haven't really found that to always be the case... especially at low frequencies.. too many other things are more important...

I absolutely agree and I was pitching the very same few in all my field coils writings at my site and everywhere else. Unfortunately not one look at the drivers, magnets, horns, loading, utilization as a big unified picture and very few assess the sound of this picture without hysteria, using competence and lucid judgment. Usually people see the field-coils they roll eye and loosing freaking consciousness. I witnessed in a past as some idiots (hi-fi industry professionals) were listening field-coils and went over the exuberant glorification of what they heard, highlighting that it clearly auditable advantages of field-coils. The fan part that they during that listening session head not field-coils but permanent magnet speakers….

Jeffrey Jackson wrote:

so my goto system... well, the basshorns are slowly being built... they won't use goto, though... (at least at first... but I may try an extension and my 505 drivers).. straight six foot 60 Hz horns... mouth about fourteen square feet... I am stil planning for physical time alignment to try to avoid digitizing my analog at this time.. I may change back at a later date... but you misread my wife... she doesn't mind large, just doesn't like unfinished R&D style horns... so I have to actually finish them, something I normally would only do for customers...

I was asking about Ming’s frustration with his big horns, I did not know what you were doing. So, it will be straight six foot 60Hz. Very cool. It is what I would do it I have a room and an abuseable person why would do it. I long time ago prepared the drivers for the projects and it is just wait for a right time.  I did not know that you do it as “job for customers”. Would you care to do some pictures? Also, how expensive that project in nowadays prices? I am not asking because I would like to move now into it myself now but others should know that there is an opportunity to do it.

Jeffrey Jackson wrote:

and why did I choose goto you asked? ….seemed to fight off congestion at high volumes on complex music better than any I had heard....

Those few time what I head GOTO I did notice the same. They did look like have very nice ability to sound under stress… I have a big theory about it and I feel that the less power handling of a driver the better it sounds under stress.

Jeffrey Jackson wrote:

….another big selling point to me was the 505 being a low resonance compression driver.. there just aren't many drivers with a resonance in the 80 to 100 Hz range like this driver... I have just begun my playing, but am already quite taken by it... this driver and its 48", 150 Hz horn will likely be the last thing I change.. it sounds very good...

As I understand you are planning to use the 505 with 150Hz and below will be the 60Hz horn. Might ask you how you are planning to stop the response from lower horn – with a sharp filter? That is one of the bottleneck that I have no solution and I do not what to go there with 3-4 order.

Jeffrey Jackson wrote:

I am beginning to get slightly dissatisfied with the 370 on the 600 horn.. and I think it is the horn.. I think I must be spoiled by the leCleac'h and conical flare horns and their ability to radiate a more even power response into the room.. the result, to my ears, is a more natural and "open" sound.. maybe less focus, but it is hard to say for certain... luckily, I can easily turn horns of this frequency on my lathe..

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