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Author Topic: PICTURES inside an SB1000  (Read 18710 times)

Shane Presley

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PICTURES inside an SB1000
« on: July 09, 2009, 10:52:26 pm »

These are older, when I was considering possibly building some, but decided not to... I know there's plenty of discussion as to open and closed chambers in this guy, so again pictures are best... sorry for the multiple posts, I don't know how to put them all in one message
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Shane Presley

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Re: PICTURES inside an SB1000
« Reply #1 on: July 09, 2009, 10:56:51 pm »

from the back speakon plate through to the inside
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Shane Presley

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Re: PICTURES inside an SB1000
« Reply #2 on: July 09, 2009, 10:57:49 pm »

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Shane Presley

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Re: PICTURES inside an SB1000
« Reply #3 on: July 09, 2009, 10:58:46 pm »

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Tom Manchester

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Re: PICTURES inside an SB1000
« Reply #4 on: July 17, 2009, 04:05:55 pm »

Neat. I've always wondered what the smaller tube ports in addition to the large center slot port accomplished. Why not one or the other? Anyone know?
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drewgandy

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Re: PICTURES inside an SB1000
« Reply #5 on: July 17, 2009, 09:51:06 pm »

Tom Manchester wrote on Fri, 17 July 2009 15:05

Neat. I've always wondered what the smaller tube ports in addition to the large center slot port accomplished. Why not one or the other? Anyone know?


3 thoughts:

1. Some people wouldn't know that it was a "bass reflex" without some round holes.
2. They originally had just the slot but then realized it was tuned too low so they added the holes.
3. The round port is a "test" port for checking that your woofer box is working.  While playing some bass you put your hand in front of the port and if you feel air chugging then it's good.  

drew
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The Guy

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Re: PICTURES inside an SB1000
« Reply #6 on: July 20, 2009, 05:10:51 pm »

drewgandy wrote on Fri, 17 July 2009 21:51

Tom Manchester wrote on Fri, 17 July 2009 15:05

Neat. I've always wondered what the smaller tube ports in addition to the large center slot port accomplished. Why not one or the other? Anyone know?


3 thoughts:

2. They originally had just the slot but then realized it was tuned too low so they added the holes.


drew


I think you're onto something here.  The SB1000 original model did not have the supplemental round ports, and the new SB1002 is also lacking these ports.  

-J
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Tom Manchester

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Re: PICTURES inside an SB1000
« Reply #7 on: July 20, 2009, 08:39:07 pm »

Perhaps it had to do with the switch from older RCF L18-p300's to the newer 18-sound drivers that they added the ports.
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drewgandy

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Re: PICTURES inside an SB1000
« Reply #8 on: July 21, 2009, 01:08:58 am »

Tom Manchester wrote on Mon, 20 July 2009 19:39

Perhaps it had to do with the switch from older RCF L18-p300's to the newer 18-sound drivers that they added the ports.


Ok, now Shane has to put the drivers back in and measure the resonant frequency then plug the holes and do it again.  My first thought from Tom's post was that the tuning would change pretty dramatically with the additional holes; so much that just a woofer change wouldn't explain it.  But maybe the shift isn't so much.  

drew
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Jon Waller

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Re: PICTURES inside an SB1000
« Reply #9 on: July 22, 2009, 10:23:06 am »

Tom Manchester wrote on Fri, 17 July 2009 16:05

Neat. I've always wondered what the smaller tube ports in addition to the large center slot port accomplished. Why not one or the other? Anyone know?



Perhaps it has to do with driver cooling.  The round port tubes look like they end right above where the magnets on the drivers would be, and they help heat escape that would build up in the front corners of the box, above the woofers.  This could improve driver reliability and reduce power compression losses.
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