Anyone heard the extremis in a small sealed enclosure? - diyAudio
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Old 7th May 2005, 08:47 PM   #1
cjh is offline cjh
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Default Anyone heard the extremis in a small sealed enclosure?

I'm thinking of buying a pair of Adire extremis drivers to use in a new pair of HT mains. I've read a lot of good things about the Kit 61's and the Kit 261's, but has anyone heard these speakers in their (very small) recommended sealed enclosure of 9.5 liters? How much bass quantity would I be giving up versus the 21 liter ported? This driver is supposed to prefer a vented alignment, so would the quality of the bass suffer as well?

I know a 21 liter enclosure is not very big, but the idea of some VERY small mains appeals to me due to space constraints near my TV.

Would the crossover from the kit 61's need to be modified for a sealed enclosure?

CJH
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Old 7th May 2005, 09:16 PM   #2
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Putting it in the recommended sealed enclosure will raise the F3 up a good octave, from ~35hz to ~70hz. You'll lose a good bit of low end by going sealed with it, and above ~200hz the efficiency difference between the ported and sealed alignments should be very similar, so I don't see there being a problem with the crossover. It would be a good idea to email their tech support about it though, Dan and Steve have been very helpful in the past when I've asked questions.
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Old 8th May 2005, 12:14 AM   #3
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Going sealed may actually help if you're planning on doing 'the usual' home theater setup : ie setting your mains to small and crossing at 80Hz to a sub.

~Most~ av receivers put a 12dB high pass on the mains, and a 24dB lowpass on the sub. Sealing the mains will give a 12dB high pass at near enough the right freq to add to the receivers slope to make the correct 24dB high pass for your mains.

Hope that made sense

Rob
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Old 8th May 2005, 12:34 AM   #4
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I've only used my extremises in vented, aperiodic, and transmission line enclosures.

The vented boxes I used were .5cubic feet tuned to 30hz. I'd say the F3 was somewhere near 40hz but usable response down to 30hz(in room). When I stuffed the ports on those and made them aperiodic they honestly didnt sound incredibly different. The were a bit weaker on the low end though and 40hz was surely end of usable output. Now in my TL's, they sound about the same as the aperiodic as far as LF cutoff. But I'm using very small lines which are heavily stuffed.
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Old 8th May 2005, 12:45 AM   #5
cjh is offline cjh
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Thanks for the helpful replies so far. One more question...

Since the f3 will be moved up and an octave and the small sealed box would pressurize very much for really low freq's, would I really just be wasting a lot of the x-max of this driver without a really powerful amp to drive them. (I have 100 watts per channel).

CJH
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Old 8th May 2005, 01:37 AM   #6
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Why not just use the wr125s driver instead, stay small, and save money as well.....
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Old 8th May 2005, 02:16 AM   #7
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Not sure what you mean exactly, within an octave of tuning the cone will be moving much more in a sealed box than it will in a ported box. Below this the ported setup will unload and start moving a lot more than the sealed setup, and above this their excursions will be roughly similar.
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Old 8th May 2005, 04:13 AM   #8
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the extremis have some kickass midbass-they sound like 10"s
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Old 11th May 2005, 08:48 PM   #9
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Quote:
Originally posted by sr20dem0n
sealed enclosure will raise the F3 up a good octave, from ~35hz to ~70hz
Bot where are the F10s?

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Old 11th May 2005, 08:49 PM   #10
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Quote:
Originally posted by BassAwdyO
Now in my TL's, they sound about the same as the aperiodic as far as LF cutoff. But I'm using very small lines which are heavily stuffed.
Which pretty much makes them aperiodic

dave
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