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Got 18" for free, looking for enclosure ideas for HT?
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Old 2nd September 2013, 08:50 PM   #21
6L6 is online now 6L6  United States
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Got 18" for free, looking for enclosure ideas for HT?
Stuff the port tight in your existing box with old (clean) socks or something similar.

Listen. You will loose a bit of efficiency, but if you are planning on a big amp, who cares.

I would also suggest using some sort of active Bass EQ. Again, if using a big amp you will be able to get the response you want with a reasonable sized box.
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Old 2nd September 2013, 09:07 PM   #22
woody is offline woody
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Back to your sealed box idea. I think I read an old article in The Absolute Sound
saying that a sealed box with FS of 30 hz and a QTS of .707 realy was flat to about 16hz after room gain kicked in.
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Old 2nd September 2013, 09:09 PM   #23
6L6 is online now 6L6  United States
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Got 18" for free, looking for enclosure ideas for HT?
Quote:
Originally Posted by woody View Post
Back to your sealed box idea. I think I read an old article in The Absolute Sound
saying that a sealed box with FS of 30 hz and a QTS of .707 realy was flat to about 16hz after room gain kicked in.
Yes, exactly!

Stuff the port in your current box - it's going to be awfully close, or at least tunable depending on how much port stuffing you use. (You are changing the box from a ported to aperiodic.)
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Old 2nd September 2013, 09:21 PM   #24
Scott L is offline Scott L  United States
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Got 18" for free, looking for enclosure ideas for HT?
Default 20 cubic feet

Quote:
Originally Posted by weltersys View Post
Jamie,

Sounds like it could be correct, and it probably will hit the excursion limits with a lot less than full power in that large of a box.

I'd try a tapped horn like the Gjallerhorn if considering a 4 x 4 x 3 foot box.
That would give a lot more "wow".

Series voice coils are not a problem as long as the polarity is correct.
I did series voice coils for over 15 years and never had a problem. OTHERS would frown upon that fact.
The 20 cubic foot volume for vented is correct as mentioned earlier in the thread.
Ideally, an infinite baffle type of volume would be preferred, if you could:
1) find a closet with 40 cubic foot availble to partition, and VENT
2) you can afford another driver. (if so, study manifold mounting)

** 20 cubic foot is really not that big, if you make it a phone booth style.
*** I had a pair of 17.5 cubic foot jobs along with a happy marriage for years
and years.
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Old 2nd September 2013, 09:21 PM   #25
toysareforboys is offline toysareforboys  Canada
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Quote:
Originally Posted by woody View Post
Back to your sealed box idea. I think I read an old article in The Absolute Sound
saying that a sealed box with FS of 30 hz and a QTS of .707 realy was flat to about 16hz after room gain kicked in.
Yeah, looks like sealed is the way to go, especially with the box size for some gain down low with ported

Quote:
Originally Posted by 6L6 View Post
Stuff the port in your current box - it's going to be awfully close, or at least tunable depending on how much port stuffing you use. (You are changing the box from a ported to aperiodic.)
There is no "current" box. I'll have to build it (if it's sealed), or have it built for me (if it's ported or more exotic).

-Jamie M.
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Old 2nd September 2013, 09:40 PM   #26
6L6 is online now 6L6  United States
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Got 18" for free, looking for enclosure ideas for HT?
Quote:
Originally Posted by toysareforboys View Post
I'm currently running a no-name 12" ported sub/box on 350rms, doesn't get as low as I'd like.
Sorry, I thought the 18" was in this box, I didn't read it well enough...
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Old 2nd September 2013, 11:32 PM   #27
toysareforboys is offline toysareforboys  Canada
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Quote:
Originally Posted by 6L6 View Post
Sorry, I thought the 18" was in this box, I didn't read it well enough...
No probs, lol

-Jamie M.
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Old 3rd September 2013, 12:26 AM   #28
rigtec is offline rigtec  United States
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Quote:
Originally Posted by toysareforboys View Post

Wow? "That +4db at 17hz has me excited..."
Don't get too excited here, this a public forum; there may be kids watching! hahahaha
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Old 5th September 2013, 09:06 PM   #29
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by toysareforboys View Post
Wow?

Click the image to open in full size.

That +4db at 17hz has me excited, but is that 42.5 cubic feet correct?!

-Jamie M.
toysareforboys,

Why not settle for something smaller..

b
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Old 6th September 2013, 02:22 AM   #30
Inductor is offline Inductor  Portugal
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bjorno,
Good (that) you're giving OP a nice 18" TH design to take advantage of.
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