any problems with this?

I might want to try EQing the ported sub for the low end and the sealed sub in the 40 to 100 Hz region.

You will find that the sub with the weaker low end response will tend to hurt your combined low end performance. Assuming the sealed sub has a typical shallow rolloff from about 30hz down, it's going to drag down the combined low end response of the two subs working together.

my suggestion:

lowpass the ported sub 40hz down
highpass your sealed sub 40hz up

You will find that the sub with the weaker low end response will tend to hurt your combined low end performance. Assuming the sealed sub has a typical shallow rolloff from about 30hz down, it's going to drag down the combined low end response of the two subs working together.


The one ported sub has more then enough power handle the low end response on its own so if this is true how would the sealed sub hurt that performance?

Im just trying to achieve, high and low end SQ and output together. I can get low end pretty easy with a very large ported sub (320 Liter sub, 15" driver, tuned to 15 Hz). The higher end is where I think I will miss out on the chest thumping stuff so I have been considering a good seal sub for that "midbass" I do believe I will lack and my mains will not provide it.

The HT room isnt done yet (just finished the sheetrock) and Im trying to figure out my bass solution.

The one ported sub has more then enough power handle the low end response on its own so if this is true how would the sealed sub hurt that performance?



Because you are calibrating them together to account for their combined output. If the sealed drops off early and the ported is doing all the work, its going to be down 3db.

You could do it with eq if you had enough power . Prolly take a lot of work. Even then, the bfd is useless under 20 hz. you'd need another solution as you are going to want to take advantage of those TCs.

The end result may be fine depending on the sort of room gain you get. If your ported sub alone has a rising low end response in your room, the two subs togetehr may wind up with a flatter response. The bottom line is that the end results will be unpredictable and are likely to require plenty of tweaking.

Because you are calibrating them together to account for their combined output. If the sealed drops off early and the ported is doing all the work, its going to be down 3db.

You could do it with eq if you had enough power . Prolly take a lot of work. Even then, the bfd is useless under 20 hz. you'd need another solution as you are going to want to take advantage of those TCs.

When you say "if the sealed drops off early", isn't the exact opposite usually the case?

SVS subs allow you to block the ports to achieve a lower FR, but at the expense of a few dbs.

The reason I was asking is that another poster recommended high passing the sealed and low passing the ported. It would seem to me that it would make more sense to do the opposite.

I should add, as long as both subs are capable and the OP is just trying to gain more output.

The reason I was asking is that another poster recommended high passing the sealed and low passing the ported. It would seem to me that it would make more sense to do the opposite.

I should add, as long as both subs are capable and the OP is just trying to gain more output.

doing the opposite is exactly what i did actually ... dual velo dls-5000r highpassed, dd18 low passed.

i suggested the opposite because his ported sub is tuned to 15hz, highpassing that would waste the low tuning advantage. i wonder what his sealed sub is?

You could do it with eq if you had enough power . Prolly take a lot of work. Even then, the bfd is useless under 20 hz. you'd need another solution as you are going to want to take advantage of those TCs.

Yes, it will be TC2K 15" drivers.


i suggested the opposite because his ported sub is tuned to 15hz, highpassing that would waste the low tuning advantage. i wonder what his sealed sub is?

The sealed sub is what ever I build.

In the end this is a DIY project but I wanted to discuss just the general performance of having a ported and a Sealed sub in a room together. I was curious on the draw backs or benefits of doing something like that. That is why I posted here instead of the DIY sub forum.

I can always build two ported subs but I want to explore all the options. Lots of talk on how great sealed subs can be especially wrt higher frequences.

My subs are more or less Epik Castle Clones with a lower tuning point and much more power but I can build one as an Epik Castle and the other could be a sealed design.

doing the opposite is exactly what i did actually ... dual velo dls-5000r highpassed, dd18 low passed.


very cool, how does it sound? Any issues with EQing?

When you say "if the sealed drops off early", isn't the exact opposite usually the case?

SVS subs allow you to block the ports to achieve a lower FR, but at the expense of a few dbs.



Blocking all of the ports on an SVS or any other sub doesn't lower the tune. Blocking one or two ports lowers the tune but its not the act of sealing that does this.

Port volume and box volume combine mathematically to determine the low frequency point of the subwoofer.

Blocking ports will decrease the headroom available by creating port noise at lower levels. No free lunch.

Because you are calibrating them together to account for their combined output. If the sealed drops off early and the ported is doing all the work, its going to be down 3db.When you say "if the sealed drops off early", isn't the exact opposite usually the case?

What Tack is saying is correct, assuming the sealed sub does not have the same low end output (not extension) that the ported sub has. Maybe he should have simply said:

"When both subs are calibrated properly over the range that they DO share, if one sub drops off early and the other sub is doing all the work at the low end, the calibration is going to be down 3db at the low end".

The calibration could actually be down as much as 6dB at the low-end depending upon the exact additive effect of the 2 subs. All things being equal, collocation of subs can actually provide up to 6dB of additive output.

very cool, how does it sound? Any issues with EQing?

very flat. but i had to use an sms-1 on the dual DLS-5000R and the built in SMS on the DD18 to do that.

IMO, its too much trouble, and also how i concluded that 40-80hz DOES NOT contain couch shaking stuff - because i had both the DLS subs right behind the couch.

i've removed everything now and am now going to try to set dual ported instead.

if your second driver is the same as the ported one ... i'd recommend just building a second ported sub (if you like the first one)

if your second driver is the same as the ported one ... i'd recommend just building a second ported sub (if you like the first one)

yeah that has always been the plan but if I spend enough time on here I start thinking....What if???

Its bad to spend so much time on here, always thinking of doing something new or buying something different

I should be finishing my HT room instead!!! :eek:

btw, your SMS has a high pass filter at 18Hz built into it, correct? what do your measurements look like under 20Hz?

yeah that has always been the plan but if I spend enough time on here I start thinking....What if???

Its bad to spend so much time on here, always thinking of doing something new or buying something different

I should be finishing my HT room instead!!! :eek:

btw, your SMS has a high pass filter at 18Hz built into it, correct? what do your measurements look like under 20Hz?

the SMS1 (latest software) has an adjustable high pass filter for the low frequencies (up to 10hz even), with 2 or 3 subs about 1.5 meters away from me, im pretty flat to 15hz depending on where i set my HPF.

the SMS1 (latest software) has an adjustable high pass filter for the low frequencies (up to 10hz even), with 2 or 3 subs about 1.5 meters away from me, im pretty flat to 15hz depending on where i set my HPF.


Thats good to know. I have the BFD but I might get the SMS1