Rerurn to Romy the Cat's Site


In the Forum: Horn-Loaded Speakers
In the Thread: Eventually - a reasonable midbass horn from GOTO
Post Subject: Double driversPosted by ygoh on: 2/17/2008
 Jeffrey Jackson wrote:
........he has listened to Goto's advice quite a bit.. they have very strong thoughts on how to do things... some you will find humorous, others you will agree with... they beleive that electronics don't really matter.. the driver is the primary importance above all others... to them, it is silly to buy expensive electronics if you do not have double drivers on all your horns.. (I do not believe in this, at all) .. they also do not believe in time alignment... I have heard the amazing transformation that time alignment brings, both with digital correction and with physical alignment... Goto says the drivers can just go anywhere.. their philosophy is that a low distortion loudspeaker is the most important thing...

double drivers... I am with you on double drivers... I understand that it shortens a horn.. to me, that is usually a bad direction.. length helps with loading.. especially in the lower frequencies... (at high frequencies I tend to like short horns, subjectively)... I also find that double drivers in the mids and up confuse things a bit.. a touch "blurry"... but I must say that I know two people who liked double drivers in the 300 to 1500 range better than single.. do note that both have *large* rooms... also note that Ming'shorn has adequate length at over 8' for a 60Hz flare...
1.) Can you explain using double drivers 'confuse things a bit'?

2.) Principally it should work the same, no?


 Jeffrey Jackson wrote:
.... the rear chamber and reactance annulling... yes, I know this subject very well... it makes a very audible difference... and deserves our attention... Bell Labs actually published a formula for source impedance with regards to horn impedance.. it was quite enlightening.. they used very high output impedance amps with their horns... and, yes, they had *giant* aluminum diapragmed compression driven bass horns... interesting, no?

the throat of Ming's horn is two times 100 mm diameter openings, I believe... I did not build the dual throat adaptor.... the drivers are quite impressive in scale.. the pictures make them seem smaller than life... but I do wish we could have the rear chambers modified for the task, as you pointed out... Goto, as far as I know, does not do this for any of their horns... for each driver they sell a few different size horns.. and no changes to teh driver.........
1.) What's that formula to calculate the back chamber volume given a throat reactance?

2.) Would it be a bigger back chamber with higher reactance at the throat?   or vice versa?

Rerurn to Romy the Cat's Site