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In the Forum: Horn-Loaded Speakers
In the Thread: Eventually - a reasonable midbass horn from GOTO

Post Subject: Some Goto SG-146LD imagesPosted by Romy the Cat on: 11/18/2009

It is 4” exit and reportedly goes down to 27Hz. I do not know what a lot about this diver but it might be a good driver for 40Hz horn. 4” into 40hz? God, it has to be at least 16 feet long horn! I would take my head off to somebody who goes for it. As a criticism I do not see on this driver the ways to adjust resonance frequency. Those vents on the back looks like cover with pressure-semi-transparent material, the same way as many Japanese do in headphones to get LF from small volume and therefore the vent most likely acts as a damper. So, I presume if to load the driver into the horn and then to glue over the vent different pressure-semi-transparent material then it would be possible to drive the Fs up and down to play with throat reactance. Still, kill me but I have no idea why they need so many magnets, if it is magnet. If they have the cone moves for 3” then it might be the case but I think their cone move not as much this huge amount of magnet is not sensible in my view. Let pretend that the cone has 6” voice coil and to saturate this type of gap to 2.4T would be necessary much less neodymium mass. Perhaps they have inefficient magnetic system with a lot of wasted stray filed? It is hard to say anything certainly. Goto feels that it is beneath them to publish the magnetic density numbers. It would be interesting to crawl around this SG-146LD driver with a gaussmeter and to see it is toss any magnetism. But where did you see a Goto owner who would be critical to his drivers….

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