Bass Shaker?

**robbo266317** · **05-10-09, 05:36 AM**

Very odd? I see the picture there now

When I looked earlier it had a link which went nowhere.

Nice graphs....

**Mike P.** · **05-10-09, 05:45 AM**

I realized I uploaded the wrong graph and edited the post to switch attachments. I was probably in the process of editing when you clicked on the link.

**SAY IT LOUD** · **05-10-09, 11:35 AM**

Hi mike my projector image is not symetrical on the screen on the bottom right side it goes up hill. I measured the height at both ends and the difference is greater than 50mm. i have checked the keystone and its at 0 i am perplexed any ideas ? Cheers Troy

**Mike P.** · **05-10-09, 02:40 PM**

I have no experience with projectors. Post your question on the Home Theater Projectors forum and I'm sure someone will help you out. Include the make and model in the post.

**SAY IT LOUD** · **05-10-09, 09:32 PM**

OK is this the formula 22" sonotube or 24" 8" ports not flared 35.98L gives me 15Hz and the end cap to end cap measurment remains the same

**Mike P.** · **05-10-09, 10:15 PM**

No, an 8" port not flared 35.98 long is for 270 liters tuned to 18.5 liters as shown in post #36.

Sam's suggestion of 365 liters tuned to 15 hz would require a 8 inch port to be 41 inches long.

Here are the dimensions for a 22 inch tube:

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Name: 22 inch tube.JPG
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Size: 37.4 KB

And here are the dimensions for a 24 inch tube:

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**SAY IT LOUD** · **05-11-09, 12:13 AM**

Ok im sold on 375L wow awsome 24" sono 58.03L everything the same

**SAY IT LOUD** · **05-11-09, 01:59 AM**

with the 375L 24" sono what is the formula. cheers Troy

**Mike P.** · **05-11-09, 04:27 AM**

I'm not sure what you mean. The formula for what?

**SAY IT LOUD** · **05-11-09, 06:07 AM**

the formula the specs to build the sub is this wright 375L, 15Hz, 24" sonotube, 8" unflared port 39.92L, sonotube cut to 58.3"L, one 3 metre 24" tube will make 2 375L subs?

**Mike P.** · **05-11-09, 07:20 AM**

As Sam suggested, the modeling was done at 365 liters, not 375. All the info is in post #56.

**SAY IT LOUD** · **05-11-09, 07:28 AM**

This is what you wrote. The 375 liter model has a 7 db advantage at 15 hz, which is substantial. and what can i use for an 8" unflared port?

**Mike P.** · **05-11-09, 07:34 AM**

That should have said 365 liters. The mistake has been edited. Most people use 8 inch diameter sonotube for the port.

**SAY IT LOUD** · **05-11-09, 07:37 AM**

thanks Mike

**Mike P.** · **05-11-09, 07:41 AM**

If you can't find 8 inch sonotube in Australia, then get a pair of 6 inch flared ports from Sam.

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