How much space needs to be around driver surround - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 14 Old 04-14-2017, 10:22 AM - Thread Starter
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How much space needs to be around driver surround

So I creating a build to match my BDI media console. The front of the sub will have a slated "grill" over the front of it. I'm using the SI HST 11. My concern is it has a large 1.65" surround (nipple) around the driver. I'm uncertain of how much that moves an any direction. I need to accommodate for that. Perhaps it only moves sideways?

Here is a picture of the HST 11:


Here is a picture of what I want to build


Here is a diagram wondering what dimensions I'll need for clearance


cc: @Electrodynamic
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post #2 of 14 Old 04-14-2017, 10:30 AM
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The spec.s say 38mm roughly 1.6" iy you want to be safe I would allow 4". My HST18 during some movies will easily move 2 +.
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post #3 of 14 Old 04-14-2017, 10:37 AM
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To be safe I'd say 2x it's height, starting from the peak outward.
Or xmech + surround height, starting from the cone outward.
Or xmax + surround height, starting from the cone outward.

That should give plenty of clearance considering the positive direction is less than half of that.
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post #4 of 14 Old 04-14-2017, 11:00 AM - Thread Starter
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Quote:
Originally Posted by Cichlid109 View Post
The spec.s say 38mm roughly 1.6" iy you want to be safe I would allow 4". My HST18 during some movies will easily move 2 +.
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Originally Posted by BassThatHz View Post
To be safe I'd say 2x it's height, starting from the peak outward.
Or xmech + surround height, starting from the cone outward.
Or xmax + surround height, starting from the cone outward.

That should give plenty of clearance considering the positive direction is less than half of that.
So xmax is 38 mm (1.5")
Surround is 42mm (1.65")

we're thinking a 3.15" plus .85" for fudge factor.. So 4" in the outward. what about the side to side plane? My guess is it won't move side to side as much (i.e. the diameter for the recessed front plate cutout)

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post #5 of 14 Old 04-14-2017, 12:26 PM
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They are designed to move in and out not side to side. It works like a piston. Never seen a sub move side to side.
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post #6 of 14 Old 04-14-2017, 03:27 PM - Thread Starter
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@BassThatHz

@Cichlid109

I suppose another option would be to have them downward firing. I'm a little hesitant because it's thicker carpet and I do like the tactile feel. What are your thoughts on that?

some people say it's the same. It very well could be. I have no frame of reference.

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post #7 of 14 Old 04-14-2017, 03:33 PM
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Quote:
Originally Posted by tjcinnamon View Post
@BassThatHz



@Cichlid109



I suppose another option would be to have them downward firing. I'm a little hesitant because it's thicker carpet and I do like the tactile feel. What are your thoughts on that?



some people say it's the same. It very well could be. I have no frame of reference.


Apart from mine bouncing a peice of metal inside, it sounds the same. I've had mine up fire, down fire and laying down facing the room and I can't tell the difference.


Sent from my iPhone using Tapatalk
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post #8 of 14 Old 04-14-2017, 03:40 PM
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If your going to go down firing I would suggest instead of having the sub firing into the carpet put a plate or something the carpet is going to muffle the sound a great deal. With my HST's I built a DO cabinet found some stainless steel legs approx. 4" H x 2" dia I attached a wooden plate that is a little larger then the box so the sub fires on the plate vs. the carpet. Look at the image I have the same top and bottom of the box.
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post #9 of 14 Old 04-14-2017, 06:33 PM
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I would leave at least 2" above the top of the surround for adequate clearance. With rated power you can get by with less clearance but if you exceed rated power you should leave 2" or slightly more above of the top of the surround for movement.
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post #10 of 14 Old 04-14-2017, 07:10 PM
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Quote:
Originally Posted by Cichlid109 View Post
the carpet is going to muffle the sound a great deal.
The carpet won't absorb much if anything at all in sub frequencies.
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post #11 of 14 Old 04-16-2017, 09:25 AM - Thread Starter
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Quote:
Originally Posted by Electrodynamic View Post
I would leave at least 2" above the top of the surround for adequate clearance. With rated power you can get by with less clearance but if you exceed rated power you should leave 2" or slightly more above of the top of the surround for movement.
What would rated power be in the case of the hst 11's?

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post #12 of 14 Old 04-16-2017, 11:16 AM
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Quote:
Originally Posted by tjcinnamon View Post
What would rated power be in the case of the hst 11's?
Cannot remember exactly but I think I remember Nick telling me he had a clone hooked up to it?? The spec.s say 2000 based on the 18's I would say a little more and your still okay.

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post #13 of 14 Old 04-16-2017, 05:20 PM - Thread Starter
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Quote:
Originally Posted by Cichlid109 View Post
Cannot remember exactly but I think I remember Nick telling me he had a clone hooked up to it?? The spec.s say 2000 based on the 18's I would say a little more and your still okay.
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I would leave at least 2" above the top of the surround for adequate clearance. With rated power you can get by with less clearance but if you exceed rated power you should leave 2" or slightly more above of the top of the surround for movement.
My guess is I won't run it that high.

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post #14 of 14 Old 04-17-2017, 09:37 PM
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Quote:
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My guess is I won't run it that high.
I can not, and will not, ever recommend over rated power. However, I have sent my twin DO-11's well over rated power for short durations. During those durations I know, and accept, that if they fail I will pay to repair them as said abuse is not covered under warranty. However, my drivers are performing flawlessly to this date without any rebuilds, repairs, etc. IIRC they are going on 3+ years of use at this level.

And yes my amplifier is a 14k clone on a pair of 11's. BUT I rarely use even 1/2 of what the amplifier is capable of for 90% of listening material and listening levels.
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