box volume for sub

thefox · 26th December 2011, 02:17 PM

got two monacor sph 165c drive units spec haer SPH-165C - Monacor HiFi bass-midrange speaker 100Wmax 8Ω - Europe Audio want to build a sub using both drive units in a closed box but not sure what box volume to use or driver placement any help would be useful cheers gareth

RS232 · 26th December 2011, 04:39 PM

Rec. net cabinet volume
Closed 8 l
Bass-reflex 16.5 l
Is on the description from your link

thefox · 28th December 2011, 06:21 PM

is it the same volume if you use two drive units in the same box cheers gareth

revboden · 28th December 2011, 09:57 PM

No, it's per driver. Have you modeled this in WinISD or the like?

thefox · 29th December 2011, 12:52 PM

no its me first sub

johnr66 · 29th December 2011, 03:25 PM

I ran them through WinISD. It recommends ported. Sealed, it wants 15 liters for two drivers. F3 is 66Hz, so not a low playing sub. Better to port, but port would be way too long for the cab. You would have to use a wrap around slot design. Some quarter wave topology might work if you have the space.

Much better to put a good 25cm driver in a 30L sealed cab for a good entry level compact sub.

26th December 2011, 02:17 PM	#1
thefox diyAudio Member Join Date: Mar 2011	box volume for sub got two monacor sph 165c drive units spec haer SPH-165C - Monacor HiFi bass-midrange speaker 100Wmax 8Ω - Europe Audio want to build a sub using both drive units in a closed box but not sure what box volume to use or driver placement any help would be useful cheers gareth

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26th December 2011, 04:39 PM	#2
RS232 diyAudio Member Join Date: Jan 2006 Location: Swindon	Rec. net cabinet volume Closed 8 l Bass-reflex 16.5 l Is on the description from your link

28th December 2011, 06:21 PM	#3
thefox diyAudio Member Join Date: Mar 2011	is it the same volume if you use two drive units in the same box cheers gareth

28th December 2011, 09:57 PM	#4
revboden diyAudio Member Join Date: Feb 2011	No, it's per driver. Have you modeled this in WinISD or the like?

29th December 2011, 12:52 PM	#5
thefox diyAudio Member Join Date: Mar 2011	no its me first sub

29th December 2011, 03:25 PM	#6
johnr66 diyAudio Member Join Date: Mar 2009	I ran them through WinISD. It recommends ported. Sealed, it wants 15 liters for two drivers. F3 is 66Hz, so not a low playing sub. Better to port, but port would be way too long for the cab. You would have to use a wrap around slot design. Some quarter wave topology might work if you have the space. Much better to put a good 25cm driver in a 30L sealed cab for a good entry level compact sub.

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