Does anybody have any experience using a FMOD crossover 50hz high pass with a second

[BWG707]

Does anybody have any opinions about using a FMOD crossover 50hz high pass with an additional sub to be used as something like an MBM-12 for mid-bass? I have a SVS PB-10 NSD (FR down to at least 20hz) and an unused Velodyne VX-10 (FR 36hz to 120hz). How exactly would I go about connecting the high pass to the Velodyne and would it be worth it or advisable? Thanks for any replys.

 

[highfigh]

Does anybody have any opinions about using a FMOD crossover 50hz high pass with an additional sub to be used as something like an MBM-12 for mid-bass? I have a SVS PB-10 NSD (FR down to at least 20hz) and an unused Velodyne VX-10 (FR 36hz to 120hz). How exactly would I go about connecting the high pass to the Velodyne and would it be worth it or advisable? Thanks for any replys.

If you want a woofer to work as a mid-bass, you'll need to use an FMod for high pass and one for low pass, creating a bandpass. You would plug one filter into the other. If the amp doesn't have an input level control, you're going to lose a bit of signal because these are passive and there's always some loss with passive filters. Look around for FMods and check for a bandpass filter. One problem I see with this setup is the phase cancellations that will occur in the overlapping region and since these are not very steeply sloped, that region will be pretty large.

 

[mike c]

i have. not worth it IMO.

i used dual 50hz highpass FMODS with dual Velodyne DLS-5000R's

 

[highfigh]

i have. not worth it IMO.

i used dual 50hz highpass FMODS with dual Velodyne DLS-5000R's

High pass on subwoofers? Why high pass?

 

[BWG707]

Thanks for the replys. The more I research this the more it seems to be not worth the effort. I have heard it can be very hard to calibrate unmatched subs and I have no experience with REW. Is it true that REW (and possibly an equalizer) would be neccessary to get a flat response using two subs like this?

 

[lsiberian]

Thanks for the replys. The more I research this the more it seems to be not worth the effort. I have heard it can be very hard to calibrate unmatched subs and I have no experience with REW. Is it true that REW (and possibly an equalizer) would be necessary to get a flat response using two subs like this?

REW won't get you a flat response it will eq your sub the best it can for the position you measure. Still the first step is always proper placement then you apply eq.

 

[BWG707]

REW won't get you a flat response it will eq your sub the best it can for the position you measure. Still the first step is always proper placement then you apply eq.

I thought that REW just gave room measurments which in turn would help to set your EQ.

 

[mike c]

High pass on subwoofers? Why high pass?

since the b&m subs can't do low bass anyway, it was a theory that highpassing them would at least give them a job (bandwidth) that they can handle. then letting a "real" sub do the low frequencies

there was also once upon a time a myth that there was a need for a mid bass module (something that does mid bass "with more headroom than all-range subs") ... it didn't work, 'but the theory was sound'

 

[highfigh]

since the b&m subs can't do low bass anyway, it was a theory that highpassing them would at least give them a job (bandwidth) that they can handle. then letting a "real" sub do the low frequencies

there was also once upon a time a myth that there was a need for a mid bass module (something that does mid bass "with more headroom than all-range subs") ... it didn't work, 'but the theory was sound'

"it didn't work, 'but the theory was sound'" reminds me of a Monty Python skit. One of them was trying to advance their plan and said, "It was a sound theory. It was wrong, but it was sound".

Once I found out that strong bass isn't necessarily good bass, it became clear that great mid-bass is usually better than bad/excessive deep bass. The mind fills in a lot of blanks and once good sound without hitting 16Hz-35Hz is heard on a regular basis, it's pretty easy to decide that the quest for 1Hz is futile and frustrating.

I can definitely see the attempt to increase the quality of the mid-bass as a valid goal.

 

[mike c]

"it didn't work, 'but the theory was sound'" reminds me of a Monty Python skit. One of them was trying to advance their plan and said, "It was a sound theory. It was wrong, but it was sound".

Once I found out that strong bass isn't necessarily good bass, it became clear that great mid-bass is usually better than bad/excessive deep bass. The mind fills in a lot of blanks and once good sound without hitting 16Hz-35Hz is heard on a regular basis, it's pretty easy to decide that the quest for 1Hz is futile and frustrating.

I can definitely see the attempt to increase the quality of the mid-bass as a valid goal.

i got it from a val kilmer - michael douglas movie ... "ghost in the darkness" or something.

but yeah, a good subwoofer will have no problem doing midbass. but it will take a great subwoofer to do both mid and low bass well.

besides the fact i have discovered (with the help of avaserfi) that what laymen think is "bass" is actually 100-120hz. i experimented on a dual 12" sealed subwoofer optimized specifically for midbass, using a DCX2496 to boost certain frequencies ... and that club/bar/concert kick in the chest is definitely in the above bandwidth.

 

[lsiberian]

I thought that REW just gave room measurments which in turn would help to set your EQ.

Nope it will give you parameter too if you use that part.