Recent content by st0nehead_ss

i take this to mean, choose whatever slopes you like, and align the phase (w delay, ie alignment tool) at the xrossover points for best transition through the crossover range

n it i also just realised the "midtop raw" ie without filters, i had the range set at 160, and the cutoff point is 150 i'll try this again saturday -_-

I should mention there was a residual gain difference I forgot to change in the x8 DSP, kicks up 9db or something or other

ive attached an mdat took some preliminary measurements, only of the kick (one of 4 cabinets) and one midtop cabinet (2x12" + compression driver.) the SPL will not be super accurate due to one cab measurement i am guessing....I took both raw (no xovers, using the range to avoid any driver...

so focus on the phase transiton throughout the crossover point and its +/- 1 octave more so than the impulse response is what you are saying?

And should this be done with crossover filters in place? The other method I see is sweep boxes "raw" and align IR, then select crossover type for best phase matching

would it also be wise to (rather than using peak arrival time) use initial impulse arrival time (ie, beginning of the upward wave?) also, on another forum, someone mentioned that REW starts sweeps at _half_ the specified measurement frequency....is this so?

Right... So given all of the above, and the specifications of my system from OP, what do you think the best way to measure for IR alignment whilst maintaining phase matching at crossover +/- 1 octave would be? As you can see there is confusion around the best method and the most direct way to...

One more thing is I was planning to run tests per this video for time alignment of IR But this seems not to consider the phase between mids and tops, and rather just align IR of all cabs to the sub...although is seemingly straightforward for my application So would it be sensible to run the...

Thankyou very much John for all your help

Great, thanks I assume this can be "simulated" ie show you the sum without needing to apply the suggested delay and run another sweep? I'm sorry for so many queries I just need to have things in order before I drag out the (rather large) stack again :)

john, if i am running the sweeps with the current crossovers in place, and use the feature of the alignment tool labelled "align phase at cursor" or whatever it is (at crossover frequency basically) will this give the necessary delays to align the phase response not only at the cursor...

thanks, i just re-looked at the thread i was referring to and the fellow taking the measurements was taking a measurement of two boxes at once, and has set t=o at cursor of the later arriving box, which had a spike. i assume usually the "REF" line is where the acoustic timing reference is...

i have seen those ones, the animated one is good. so im guessing the spike to the right is your sub where you have set t=0 at cursor?

john, im just going back over this, and through some other peoples threeads...on the impulse graph, where the line with REF is set, is this little spike indicating that this is the position of the timing reference chirp? i didnt thing from what you wrote here that it should show up in the graph?