GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Horn-Loaded Speakers
In the Thread: ... again on GOTO Unit drivers...

Post Subject: The Goto’s strangeness…Posted by Romy the Cat on: 8/23/2009

Hm,

SGSG-37FRP, Driver frequency band: 400Hz - 10kHz, 18,500 gauss
SG-370, Driver frequency band: 400Hz - 18kHz, 23,000 gauss
SG-370DX, Driver frequency band: 400Hz - 20kHz, 24,000 gauss

Inversing, they build up magnetic density and extend HF. It is a legitimate way to do the things, but there is a catch in it. If they use the same cone same magnetic stricture and the difference is only in the amount of magnet that they piled up then what did they do with changing of Q of the cone? Rising magnetic force from 1.8T to 2.4T would severely over-damp the lower knee of the driver making the harmonics inappropriately rapidly deflating. The way to deal with is it to use different (softer) suspension but I never heard GOTO users ever mention the existence of different diaphragms. So, I wonder are SGSG-37FRP, SG-370 and SG-370DX use the same diaphragms?

Also, what do they mean: Driver frequency band: 400Hz - 20kHz but optimal crossover is 500Hz - 5kHz? Is it their desire to sell one mode driver from 5kHz and up or is it their admission that those driver do not sound well over 5kHz. Frankly I feel that what GOTO say is BS as looking at the phase pas on the SG-370 it shall go VERY much higher than 5kHz. To make a titanium cones to have 5kHz a phase plug might not even need to be there. Strange…

robert, when you listened to SG-370, with the top run wide open than did you try to disconnect the ribbon twee and to list just one GOTO driver atop. If you did then can you comment on it? Also, you said that the ribbon was crossed @10kHz, 1st order. This is a use of ribbon as essentially a MF driver. This raises many questions… It would be interesting to interview the person who made those decisions…

The Cat

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