Downwards Bass port in a Bookshelf

Dan_Steele · 25th July 2007, 09:33 AM

Hi guys,

Im just designing the cabinet for my new bookshelf speakers, using Hivi D6.8 and Hivi SD1.1A tweeter, they are actively bi-wired with two gainclones each to give you a bit of background.

Now, I have chosen the 2" precision port from PE (should be ariving today) and I'm doing a Cad drawing.

Now from what I can see and using WinISD to calculate box dimensions and port length (precison port req. 1" extra to accomodate for the flared ends) Im going to have trouble leaving a 2" gap between the end of the tube and internal speaker wall (or in this case the back of the tweeter; max achievable gap is 1")

Without resorting to making the box even deeper, can I place the port facing downlwards as opposed to the conventional? rear mounting. (obviously the cabinet will be on spikes) as this would give me plenty of clearance. I will be using 19mm MDF.

thanks for any input

Regards

Dan

sreten · 25th July 2007, 09:40 AM

Hi, short answer is yes you can, done in these,

/sreten.

Dan_Steele · 25th July 2007, 09:44 AM

Cheers Dude! Will save me from having extra long speakers knowing that.

Regards

Dan

Petriej · 25th July 2007, 04:04 PM

There's some formula somewhere about how much area you need under the port to let it breathe correctly. This should help you figure out how high the legs/spikes have to be to prevent chuffing.

25th July 2007, 09:33 AM	#1
Dan_Steele diyAudio Member Join Date: Jul 2006	Downwards Bass port in a Bookshelf Hi guys, Im just designing the cabinet for my new bookshelf speakers, using Hivi D6.8 and Hivi SD1.1A tweeter, they are actively bi-wired with two gainclones each to give you a bit of background. Now, I have chosen the 2" precision port from PE (should be ariving today) and I'm doing a Cad drawing. Now from what I can see and using WinISD to calculate box dimensions and port length (precison port req. 1" extra to accomodate for the flared ends) Im going to have trouble leaving a 2" gap between the end of the tube and internal speaker wall (or in this case the back of the tweeter; max achievable gap is 1") Without resorting to making the box even deeper, can I place the port facing downlwards as opposed to the conventional? rear mounting. (obviously the cabinet will be on spikes) as this would give me plenty of clearance. I will be using 19mm MDF. thanks for any input Regards Dan

25th July 2007, 04:04 PM	#4
Petriej diyAudio Member Join Date: Jun 2007	There's some formula somewhere about how much area you need under the port to let it breathe correctly. This should help you figure out how high the legs/spikes have to be to prevent chuffing. __________________ Signature: Optional signature you may use to appear at bottom of your signatures.

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25th July 2007, 09:40 AM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, short answer is yes you can, done in these, /sreten.

25th July 2007, 09:44 AM	#3
Dan_Steele diyAudio Member Join Date: Jul 2006	Cheers Dude! Will save me from having extra long speakers knowing that. Regards Dan

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