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The Free Air Driver Excursion Video Thread


Ricci

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  • 2 weeks later...

TC LMS ULTRA 5400

 

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This driver is really clean and quiet through the first 50mm peak to peak of excursion but picks up some surround and motor air noise from there. At about 70mm peak to peak the cone starts tapping into the spider landing which limits the excursion. This can be seen and heard at the end of the video. The surround is starting to reach it's limit as well by this point. The motor and spider system seem capable of supporting much more if not limited by these mechanical clearances.

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MTX 9515-44

 

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This heavy duty 15" driver is relatively quiet through the first 40mm peak to peak before the mechanical clatter of operation starts to increase. There is no pole or under gap venting on this motor so all of the air movement produced by the large 4" voice coil comes out at the top of the gap and from under the spider landing. The frame has screens in it as well to prevent debris from entering the gap. This produces some pumping air sounds from this area at high excursion. The driver was driven to a little past 65mm peak to peak where the amplifier channel ran out of power into the 8ohm nominal load. The driver appears to be capable of at least 80mm peak to peak before damage as it was still responding to increases in power and there is plenty of clearance in the mechanicals.

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