Originally Posted by Krobar
Was hoping for some advice with subwoofer placement and sealed vs ported. I current have a single Mini Marty and the REW file below measures this subwoofer at the front centre(ish) of the room and back right corner (My only 2 real options for sub placement):
It seems to me the two positions compliment each other so I would benefit from dual subs, what do you think? I don't get anywhere near the max SPL for the single Mini Marty, would dual sealed subs likely be better than dual Martys?
Further to the responses from AustinJerry and Candor, a couple of additional thoughts.
i) When using trace arithmetic option, just adding the two results together will show the predicted response based on running the same timing (delays) for both subs. As can be seen from your measurements, each location will required different amounts of delay.
I see that there are a couple of timing adjustment options within REW. Open the file you posted in REW, use the All SPL Tab and then the Controls button at the top right. In here you will see Time Align and also Align IR start. I have not read up on either of these, so I will leave that to you. I did note that if you do a Trace arithmetic option (once again from the All SPL tab) to add say add Measurement 2 and Measurement 4 you will see a new A+B Measurement. If you then select just measurements 2 and 4 only and the select Time Align, and then do another Trace arithmetic for 2 & 4, you will see a smoother response.
Actually, since you are only comparing two subs (sub locations) you should also be able to use the alignment tool to play with delays for the two selected subs, to see what gives good results.
ii) As to the way forward, the first thing I suggest you do is figure out what you are trying to achieve, i.e do you want a) max output, even if it is only a peak at one spot (put two subs at the same location); b) a reasonably good response across most of the range, but not too concerned about the lowest frequencies, or c) as flat as possible, rather than higher output.
In my experience, sealed subs go lower, but at the expense of a higher output . Have a look at the output charts for the likes of the SVS PB4000 (https://www.svsound.com/products/pb-4000#techanchor
). In may case, I am not too fussed about max SPL, so I run all sealed subs, as making my couch kickers was easier in a sealed config.
However, given you have already built a mini-marty and seem to be chasing output, it may be worth spending some time learning how to use REW a bit more and then simulate what may be achieved. As noted by candor, you will get best results, when you can load delays and PEQs. Depending on the sub amps you use, this may be able to done via the amps, or you can use the likes of a MiniDSP 2x4. If you then want to get really adventurous, you could also explore the MultiSub Optimizer (MSO) software, to get an even more finessed result.
For what is is worth, I use a MiniDSP 2x4HD and the results from MSO, to blend my 4 subs, 2 x sealed couch kickers and 2 x SVS PC 13 Ultra in sealed mode.
I trust this makes some sense.