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Date: July 25, 2003 at 05:19:52
From: Adrian Mack, [dialup-196-142.wasp.net.au]
Subject: Re: Distortion is caused by much more than just excursion limits

URL: My website, Peerless XLS 12 Dual PR Sub Project, 18LW1400 vented sub, Horns, etc.....



Hi Brian!

I just took a quick look at XBL2 technology, and it seems Adire has made an excellant way to keep linearity and high levels of excursion at the same time.

> I will throw in with prosound drivers that many of
> them are low Xmax with large high strength motors
> made to handle extreme amounts of power which is
> helpful.

Most prosound drivers do have rather limited xmax in comparison to commerical drivers, but the best ones have more than enough excursion for subwoofer applications. They are also higher in sensitivity too, and they really do belt out the bass and sound very clean.

An average JBL Professional Series woofer generates just 0.3% THD at 10% of full rated power for its two midband octaves, which is 60watts for a 600watt woofer or 80watts for an 80watt woofer. The point is that this is extremely good performance, and unrivaled by commerical offerings. As we get closer to resonance, distortion increases of course, and the best JBL components still generate with under -45db harmonics which is less than 1%, and near resonance this is still very low. Use of copper shorting rings (faraday) greatly decreases harmonic distortion also, and JBL have done a great job at balancing motor strength and cone mass to achieve low frequency reproduction with absolute minimal distortion. The Eighteen Sound drivers also use similar technology and generate very little distortion and minimal power compression. TAD (TAD-Pioneer) also make some excellant bass drivers.

In any case, Tumult looks like a great driver and 3% THD is very, very good. Maybe one day I'll get a Tumult and do some distortion tests against the JBL and Eighteen Sound drivers just for fun!

Adrian


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