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Re: Autotuba question

Posted by Bill Fitzmaurice (P) on September 20, 2004 at 06:41:14

In Reply to: Autotuba question posted by freddyi on September 19, 2004 at 09:38:26:

If mounted on 6" legs (downfiring the horn mouth) the AutoTuba is good for pro-sound, well able to exceed a typical 15" or 18" direct radiator, but there is the matter of power. 100 watts in is the max, so they'd be fine for small/medium rooms; I wouldn't want to push a heavy metal act in a 500 seat room with them. For PA or electric bass/keyboard I'd cross over at 100-120Hz, depending on the midbass box. It runs very strong to 250 Hz, but you'd have integration problems going that high.

Tuba 18 really needs boundary reinforcement, so it would only be good for pro use in a permanent install; the larger mouth of the AutoTuba, combined with the 1/2 space loading you get when using legs, is OK for freestanding use.

With 100 watts in the Xmax gets pegged at about 25Hz; in theory you can exceed Xmax at 20 Hz, but it's not too likely you'd ever get 100 watts into it that low anyway. In home theatre with a 200 watt amp I've not been able to max the driver. It is quite clean at volumes well beyond what the wife will let me run it at.

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Kimber Kable

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