Reduce size of SP118x Peavey Cabs

Shrek44007 · 18th February 2007, 06:54 PM

Hi, I am gigging with a pair of Peavey Sp118x BassBins. I love the sound I am getting, but the size of the cabs is getting me down. One person can't carry a bin on his own.

I used boxplot to try and design a new cab, but it came out even bigger.

How small can I go when making a new cab? Would love to fit it into a cab the size of the wharfedale 18" bins.

The drivers in the bins are 1808-4 SPS BWX. 4ohm. 500w cont. 2000w peak. vas: 311.7 / Qms:10.215 / Qes: 0.509 / Qts: 0.485 / Xmax: 2mm / sensitivity: 97.5db.

PLEASE ... Any help and advice would be appreciated.

Picture of Peavey Cab

Shrek44007 · 22nd February 2007, 04:27 AM

Hi,

I really thought someone would have an answer to my problem ... Or is the experts on holiday?

Rademakers · 22nd February 2007, 04:23 PM

I guess they're,

The T/S-parameters of the speakers suggest to use it in a large to very large cabinet (like you do now). If you would make it smaller it would probably give a "hump" in the response a bit above tuning.
If you want a smaller cabinet either use different speakers (lower Qts) or isobaric loading (which is quite foolish for PA-use, so forget I mentioned it).

By the way, are you sure that Xmax is correct, it's really, really small.

Wkr Johan

dangus · 24th February 2007, 03:58 AM

You could look carefully at how much bass you really need. If it's regular rock'n'roll, there may not be much below 80 Hz (since on a bass guitar the 2nd harmonic is much louder than the fundamental). That could allow you to get away with a smaller box, and the peak could be a good thing if it reinforces the kick drum.

Or, just get yourself a hand truck or trolley or dolly to wheel the cabinets around with.

Foxx510 · 24th February 2007, 04:07 AM

To me they look compact for a 18in cab. I doubt you are going to get anything smaller to work for you, given that you are working venues that require the use of an 18in cab.

BassAwdyO · 24th February 2007, 08:29 PM

I also agree that reducing the cabinet size is not the best idea.... Perhaps put some casters on them, or get a hand truck... but if you really want something smaller with similar output you might have to look for new subs entirely...

22nd February 2007, 04:23 PM	#3
Rademakers diyAudio Member Join Date: Jan 2005 Location: Rotterdam, NL	I guess they're, The T/S-parameters of the speakers suggest to use it in a large to very large cabinet (like you do now). If you would make it smaller it would probably give a "hump" in the response a bit above tuning. If you want a smaller cabinet either use different speakers (lower Qts) or isobaric loading (which is quite foolish for PA-use, so forget I mentioned it). By the way, are you sure that Xmax is correct, it's really, really small. Wkr Johan __________________ Impossibilities we do immediatly, miracles take slightly longer.

24th February 2007, 08:29 PM	#6
BassAwdyO diyAudio Member Join Date: Jun 2004 Location: Illinois	I also agree that reducing the cabinet size is not the best idea.... Perhaps put some casters on them, or get a hand truck... but if you really want something smaller with similar output you might have to look for new subs entirely... __________________ The golden rule of DIY: Build nice, or build twice!

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22nd February 2007, 04:27 AM	#2
Shrek44007 diyAudio Member Join Date: Feb 2007 Location: Cape Town	Hi, I really thought someone would have an answer to my problem ... Or is the experts on holiday?

24th February 2007, 03:58 AM	#4
dangus diyAudio Member Join Date: May 2004 Location: Vancouver Island	You could look carefully at how much bass you really need. If it's regular rock'n'roll, there may not be much below 80 Hz (since on a bass guitar the 2nd harmonic is much louder than the fundamental). That could allow you to get away with a smaller box, and the peak could be a good thing if it reinforces the kick drum. Or, just get yourself a hand truck or trolley or dolly to wheel the cabinets around with.

24th February 2007, 04:07 AM	#5
Foxx510 diyAudio Member Join Date: Nov 2006	To me they look compact for a 18in cab. I doubt you are going to get anything smaller to work for you, given that you are working venues that require the use of an 18in cab.