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Old 08-28-2011, 07:55 PM
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Default OA-12 Port Area

I'm lazy and don't really want to search old threads. I am doing strictly an spl box with one 12. I was just wondering where i should start as far as port area is concerned. I will be testing just about everything but wanted a ball park area to start with. I got a bunch of 3" and 4" aero's and I can make other sizes out of mdf if I get really rambucious. I know through testing my sa's like anywhere from 7-11 square inch's per cubic ft. Just curious if these are close to that.
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Old 08-30-2011, 08:08 AM
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About 6 second of searching returned this post of mine:

Quote:
I don't know where the idea of X in^2 per ft^3 started but it is not a very good ideology to follow. If that were the case a single port for a single 12" driver in 3 ft^3 would be 36 in^2 for 12 in^2 per 1 ft^3 which is a 3x12" port...and good luck fitting it inside the enclosure due to the port length required. That's a huge port for a single 12"! Most drivers out there can't excite that huge port area, so that huge port is wasted for the most part. Simply stick with 12 in^2 to 18 in^2 per 12" driver and you will be fine.

For strictly SPL competition purposes tuned high you can go up to/around 30 in^2 if you want. For daily use I highly recommend ignoring the previous sentence.

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Old 09-07-2011, 11:28 PM
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I don't know where the idea of X in^2 per ft^3 started but it is not a very good ideology to follow. If that were the case a single port for a single 12" driver in 3 ft^3 would be 36 in^2 for 12 in^2 per 1 ft^3 which is a 3x12" port...and good luck fitting it inside the enclosure due to the port length required. That's a huge port for a single 12"! Most drivers out there can't excite that huge port area, so that huge port is wasted for the most part. Simply stick with 12 in^2 to 18 in^2 per 12" driver and you will be fine. Nick are you saying NOT to go by X amount of inches squared per cu.ft? but 12 to 18 inches squared per SUB for any Manufacturer?

Last edited by jrouter76; 09-07-2011 at 11:37 PM. Reason: jumbled line
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Old 09-07-2011, 11:41 PM
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Quote:
Originally Posted by Electrodynamic View Post
About 6 second of searching returned this post of mine:


For strictly SPL competition purposes tuned high you can go up to/around 30 in^2 if you want. For daily use I highly recommend ignoring the previous sentence.

Nick are saying NOT to go by X amount inches squared per cu.ft. ? But use 12 to 18 inches squared Per SUB instead? and does this apply for ALL SUBS no matter the Manufacturere?
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Old 09-08-2011, 07:30 AM
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Quote:
Originally Posted by jrouter76 View Post
Nick are saying NOT to go by X amount inches squared per cu.ft. ?
Yes.

Quote:
But use 12 to 18 inches squared Per SUB instead?
For a 12" 600 watt driver, yes.

Quote:
and does this apply for ALL SUBS no matter the Manufacturere?
No it does not. As I stated in thr post you quoted me on I stated that most drivers can't excite that much port surface area. A 600 watt driver in a daily setup with anywhere near rated power will not show huge gains with a port larger than what I posted previously. You also just replied in a thread where I posted about port surface area again:

"Keep in mind that is per driver ,not total, for two 15's. Power per driver you're looking at 750 watts RMS if you have a true 1500 watts RMS for the pair of 15's. The only time we have seen an increase in SPL was when we went from 1500 watts to 3000 watts on a single 15" driver. When we doubled the power we changed out the single 6" port (28 in^2) for a single 8" port (50 in^2) and we gained 3 dB. Using 1500 watts and less there was no significant difference in output going from a 6" port to an 8" port. IIRC we gained 0.2 dB when we increased the port surface area with the lower amount of power. Unless you are competing hard-core and have over 2k watts per driver there is no significant benefit in using a huge port. I don't know where that mind set comes from but at least on here I have posted numerous times about port surface area myths."
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Old 09-08-2011, 04:42 PM
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Quote:
Originally Posted by Electrodynamic View Post
Yes.



For a 12" 600 watt driver, yes.



No it does not. As I stated in thr post you quoted me on I stated that most drivers can't excite that much port surface area. A 600 watt driver in a daily setup with anywhere near rated power will not show huge gains with a port larger than what I posted previously. You also just replied in a thread where I posted about port surface area again:

"Keep in mind that is per driver ,not total, for two 15's. Power per driver you're looking at 750 watts RMS if you have a true 1500 watts RMS for the pair of 15's. The only time we have seen an increase in SPL was when we went from 1500 watts to 3000 watts on a single 15" driver. When we doubled the power we changed out the single 6" port (28 in^2) for a single 8" port (50 in^2) and we gained 3 dB. Using 1500 watts and less there was no significant difference in output going from a 6" port to an 8" port. IIRC we gained 0.2 dB when we increased the port surface area with the lower amount of power. Unless you are competing hard-core and have over 2k watts per driver there is no significant benefit in using a huge port. I don't know where that mind set comes from but at least on here I have posted numerous times about port surface area myths."
I thank you now my mind is starting to see some things clearly...I have 2500 watts I`ll be using on a pair ofSA Zv2s I should be okay using a 6" aero port 18"long tuned to about 30 hz with a net of 3.6 cu.ft. after port and subs displ. I should be ok should`nt I? btw Thanks
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