Peerless 12" XLS sealed cabinets

[tktran]

Has anyone struck a good cabinet design for the 830500? I've found a few of recommendations for use with a passive radiator, but few in a sealed box.

I simulated in winISD but got an F3 of about 70Hz...


This is to be used for music and HT, with compact (5.5") 2 way floorstanders (or bookshelves)) so articulate bass is important. The woofer in a modest sized box (<2 cubic feet)

I've never heard this woofer, would prefer not to go with the PR because I am wary of unpredictable results (eg. rear riring PR up close against wall?).

I understand there may be other woofers better suited for small sealed boxes but they tend to be unavailable or overpriced in Australia, and would prefer to use what is locally available at reasonable prices.

Power requirements not a problem with expected 300-500W RMS to be available (own design using TI class D)

[Dave Jones]

You just haven't googled enough. An XLS in a sealed box requires equalization. Here's the most famous one: http://www.linkwitzlab.com/thor-intro.htm

[Therac]

D-S-T (Danish Sound Technology) has some application notes for the 830500 in a sealed box.

www.d-s-t.com then select "engineering" at the left...

Hope that you can use it...

-Therac

[angel]

Actually, you want a sealed box with a Qtc of 0.3-0.6. You're aiming for a -10dB point of about 30Hz to match room boundary gain.

A quick sim in WinISD using the 10" and 12" XLS-CAR driver gives good results around 69 and 58,5 litres respectively (Q 0.5).

If you want entirely optimal results, you'll still need a Linkwitz transform to move the poles to match the room boundary poles, but that requires measuring your room etc.

For starters, I'd just go with an enclosure with a Qtc of 0.5, to put you in the ballpark. You can add electronic compensation circuits later on.

[tktran]

I've read the Peerless engineering papers.

In the design or vented and passive radiator boxes, excursions limits at low frequencies are considered, and the design aims to makes use of minimising the risk of over-excursion by way of port or PR tuning. Also it is highly recommended to make use of subsonic (<20Hz) filters.

However there are no such warning or design targets to prevent exceeding the excursion limits in the 30L sealed box.

Will I still need to consider excursion limits?

[Nisbeth]

Try modelling your idea in UniBox (http://home20.inet.tele.dk/kou/ubmodel.html)
This should give you an idea about the driver behavior in closed, reflex and PR-systems


/U.

[5th element]

Ive done an XLS10 in a sealed box with EQ and it sounds great and I have not bothered with any kind of subsonic filter. Why would I need one? There aint much noise in music below 20 anyway, if any. HT though thats another matter. But if you were going to have a filter at about 20hz youd want it to be really steep.

[Dave Jones]

Originally posted by 5th element
Ive done an XLS10 in a sealed box with EQ and it sounds great and I have not bothered with any kind of subsonic filter. Why would I need one? There aint much noise in music below 20 anyway, if any. HT though thats another matter. But if you were going to have a filter at about 20hz youd want it to be really steep.

How did you EQ it? Some (most?) plate amps use a peaking highpass filter for EQ, so you automatically get a subsonic filter whether you want one or not.

[THOR]

and this guy is in oz.
http://members.ozemail.com.au/~joeras/sub_index.htm
this is one of the best!