nothingman
Senior Member
I’m considering plugging the port of my LS50 Metas and wondered if there are other considerations than simple bass response.
See Amir’s review measurement below, where I circled the port resonance in the midrange.
This measurement got me thinking I would achieve more midrange clarity if I plugged the port, and I assume it would lower overall group delay in the bass as well.
What I’m wondering is what else does plugging the ports do? Am I messing up how the mid-driver performs elsewhere in the frequency response? Is plugging a port known to introduce new resonances or breakup of a mid-driver, or create distortion or limit the SPL or anything? Does it mess with the impulse response or phase? Or does plugging the port only help everything about the speaker performance except for the low bass? I haven’t seen this answered.
Background:
I’m using a miniDSP SHD with Dirac and a single KC62 sub.
Per the standard instructions, first I tested and implemented the high-pass and low-pass filters and then used REW acoustic timing reference to time-align the sub with L+R and got the sub volume level in the ballpark then I ran Dirac measurements and filters.
HPF for the LS50 is set to 100hz BW 2nd order (12db/oct)
LPF for the KC62 is set to 80hz LR 4th order (24db/oct)
Plugging the port would of course come at expense of raw bass output from the port, but I think my KC62 and room gain in the region can mitigate that fine. That said, if I try plugging the ports I would start the whole integration process from the beginning and experiment with dropping the BW2 HPF down to 90 or 80hz but no lower.
See Amir’s review measurement below, where I circled the port resonance in the midrange.
This measurement got me thinking I would achieve more midrange clarity if I plugged the port, and I assume it would lower overall group delay in the bass as well.
What I’m wondering is what else does plugging the ports do? Am I messing up how the mid-driver performs elsewhere in the frequency response? Is plugging a port known to introduce new resonances or breakup of a mid-driver, or create distortion or limit the SPL or anything? Does it mess with the impulse response or phase? Or does plugging the port only help everything about the speaker performance except for the low bass? I haven’t seen this answered.
Background:
I’m using a miniDSP SHD with Dirac and a single KC62 sub.
Per the standard instructions, first I tested and implemented the high-pass and low-pass filters and then used REW acoustic timing reference to time-align the sub with L+R and got the sub volume level in the ballpark then I ran Dirac measurements and filters.
HPF for the LS50 is set to 100hz BW 2nd order (12db/oct)
LPF for the KC62 is set to 80hz LR 4th order (24db/oct)
Plugging the port would of course come at expense of raw bass output from the port, but I think my KC62 and room gain in the region can mitigate that fine. That said, if I try plugging the ports I would start the whole integration process from the beginning and experiment with dropping the BW2 HPF down to 90 or 80hz but no lower.
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