Recent content by Gordon Palmer

Thanks

I was running a few measurements on my multi subs. Is there any significance to these measurements. Comparing unaligned to time aligned subs? I use MSO so my subs are not time aligned in normal usage. Thanks

Sorted. It's an Arcam AVR20. Turning Dirac off gave the identical readings (although I can't imagine how) Select a Dirac filter and REW works fine.

I've installed a new AVR and ran the usual sweeps with different curves no problem Today I thought I'd double check the AVRs distance settings. I've done hundreds of sweeps before but this time All the results are the same for every speaker except the LFE. Timing is exactly the same FR is the...

There was a low level hum..not enough to bother me in normal listening but I rearranged a few power cables at the back of my rack and it has reduced significantly. Timings have returned to normal so this may have been the cause. Thanks for help.

Yes I hear the usual chirp. MDAT attached. Re running the same sweep multiple times gives different timing and frq plot every time.

I've run REW on a Macbook for some time with UMIK-1 and a Minidsp 2X4 HD. Prepro is Marantz AV7705 Today running a routine sweep of my subs, the timing results are all over the place, into 100's of ms and varying wildly from one sweep to the next. I'm using acoustic timing to the Left channel...

Thanks.I have done that on a previous setup and it was useful. I intend to do it in this setup but we;re in lockdown here so I'll have to wait to get help moving the sub. Previously I was only looking at freq response but this time I'm going to focus on the waterfall/spectrogram/decay plots as...

Thanks for responding Did a bit more measuring and it appears to be a strong room effect on the current sub location The room has a strong boost at 22HZ measured at MLP. Measuring the sub at the cone shows an inverse response at around 22hz. I am less concerned with the frequency response as I...

These are my measurements for my subwoofers,before and after EQ in my untreated room. My interest is in reducing the ringing..maybe with bass trapping. My questions are 1. What can I deduce from the graphs? Is my room good,bad or average? 2. I assume there is no practical way to improve at...

thanks

Could someone please explain what this graph shows in respect of the phase plot. Is it good, bad or so-so Thanks

Ah yes, of course, silly me Thanks

I was running sweeps of my fronts+sub and centre+sub both XO at 120hz I noticed the 15-120hz range was the same shape curve in both (as expected) but the centre channel was 5db lower. Beyond 120hz the levels match out to 15Khz I then checked the surrounds and they are also 5db lower than fronts...

OK thanks I'll have a look