Hi all,
In the last couple of weeks I put together two nice little 16L sealed boxes for a fellow audio enthusiast. These contain one SB23MFCL45-4 each and the idea is to EQ them in to response submission - all good there.
However, when I was putting them together I expect the boxes to come up a little small in volume as I had added bracing and was expecting to stuff them and lower the Q. They are cubes (265x265x265mm internally) so I knew I would have to tame a resonance anyway so the plan was to lower Q and eliminate the standing wave in one go.
As it turns out the box shows a lower Q and a higher standing wave than expected. The aim was for a 0.7> Q and I thought the standing wave would be around 325hz. However, the Q is 0.66 and the standing wave resonance is 775hz. Perfect but sheer luck!
TBH, I don't think I need to stuff these cabinets as the resonance is so far out of the pass band that with even a modest L12 @ 100hz the resonance is down 40db. I don't really want to lower the Q any more as it is fine for EQing as is.
Any reasons TO stuff? I can't see the resoance effecting the system.
Cheers! 🙂
In the last couple of weeks I put together two nice little 16L sealed boxes for a fellow audio enthusiast. These contain one SB23MFCL45-4 each and the idea is to EQ them in to response submission - all good there.
However, when I was putting them together I expect the boxes to come up a little small in volume as I had added bracing and was expecting to stuff them and lower the Q. They are cubes (265x265x265mm internally) so I knew I would have to tame a resonance anyway so the plan was to lower Q and eliminate the standing wave in one go.
As it turns out the box shows a lower Q and a higher standing wave than expected. The aim was for a 0.7> Q and I thought the standing wave would be around 325hz. However, the Q is 0.66 and the standing wave resonance is 775hz. Perfect but sheer luck!
TBH, I don't think I need to stuff these cabinets as the resonance is so far out of the pass band that with even a modest L12 @ 100hz the resonance is down 40db. I don't really want to lower the Q any more as it is fine for EQing as is.
Any reasons TO stuff? I can't see the resoance effecting the system.
Cheers! 🙂
Not really, at ~ -25 dB we're done, though ideally might need to mass load them with ~ a matching weight.
Out of curiosity, what's your measurement setup like? Distortion levels seem great. I have a sealed 10 liter sub with a DCS205-4 that I've been considering replacing with a SB23 - I doubt the improvement is significant at my low listening levels, but it would be nice to have something to compare to.
@GM cheers for the input. Not sure exactly how they will be used but sorbothane was mentioned 🙂
@jaakkopetteri this was near field so doesn't give typical use level conditions. I would say that these are real beuties of drivers, I had two pairs I used sealed for a year or so and they were great.
@jaakkopetteri this was near field so doesn't give typical use level conditions. I would say that these are real beuties of drivers, I had two pairs I used sealed for a year or so and they were great.
Well, I just responded to the main Q asked, but if using it over a wide BW (my bad for not reading further), then some damping is required on at least ~70% of the back, top, one side to keep reflections from modulating the driver, causing some comb filtering that may/may not be audible depending on power used, construction, so many/most? folks just stuff to 'taste', which considering your bracing scheme a good plan since these surfaces parallel to the baffle need treating too.