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Date: July 06, 2003 at 20:41:53
From: Adrian Mack, [dialup-196-214.wasp.net.au]
Subject: Re: Port sizes..

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



For both the 10 and 12" XLS drivers (830452 and
830500), if using the Peerless 10 and 12" PRs
respectivily, then you would not add any extra mass to
it. Be sure to purchase the standard 425g 12", or 400g
10" models, which are the most common ones but there
are actually three different models all with a
different moving mass. But these are the ones you need.
Use the 10" PR for the 10" XLS, and the 12" PR for the
12" XLS in this case. If you like, you could even
purchase the 12" PR for the 10" XLS which would
actually be better for it, but you dont *need* to, I'll
tell you what mass to add later if you decide to go
this route.

Enclosure volume for the 10" XLS is 30L, and for the
12" XLS is 50L. Each will extend to 20Hz inroom. Be
sure to add the any extra volume displaced by bracing,
amplifiers, and drivers/PRs to the total box volume
when you calculate the dimensions you need.

I also highly reccomend a highpass filter at 20Hz (aka
subsonic or rumble filter) to prevent frequencies
entering the system where it is highly unloaded.

Adrian


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