Thanks for sharing the file
So when it comes to displaying graphs in REW, here is what I generally do (of course other folks here might do it differently)
Frequency response:
- set smoothing to 1/12 when you want to scrutinize the bass and the mids/highs too
- set smoothing to 1/3 or even 1/2 or 1/1 when doing volume matching
- set smoothing to Psy if you want to have an idea how the system will sound to your ears
Phase:
- smoothing to 1/12 and always unwrap
Looking at your phase graph I would say there is some room to improve there:
Ideally the phase curve shall be flat from 20kHz down to as low as possible (my systems are usually flat down to about 600Hz)
Not sure if you have access to Dirac Live, that shall be able to fix your phase curve down to about 300Hz or so - or you can try to do that manually with rePhase but that has a pretty steep learning curve
Your distortion curve looks very good:
(this is set to %)
The Impulse response curve shows that you have some reflections in your room
The way to deal with those is to apply some physical room treatment (absorbers put in the first reflection points)
The step response curve shows how much ringing you have in the bass:
Unfortunately you have plenty - this curve shall not oscillate that much
The Group Delay curve essentially shows the same about your bass:
Starting from below 500Hz (where the room takes over) you have 50-100ms of group delay (meaning that your bass notes are 'lagging behind' the rest of the spectrum)
Group delay of this magnitude is definitely audible
The RT60 (Topt) curve shows the amount of reverberation in your room
In the mids/highs it shall be in the 300-400ms zone
You can battle this with physical room treatment too
The Waterfall curve will also confirm that:
And finally the Wavelet curve (Spectrogram) with the settings that you see below
This curve will show you again how your bass lags behind the rest (the Peak Energy Time dashed line)
If you have ported subs then this value is considered OK but you can also see on the graph the same ringing that we saw in the Step response curve
So what can you do to 'speed up' your bass and reduce ringing?
That's where the integration of your two subs will come into the picture and that's where things start to become nasty
Not sure what DSP you can use but essentially you will need to adjust the delay values of your subs to optimize the temporal response
You can do that based on further REW measurements that you perform with Acoustic timing reference
Where you take for example the front left channel as the reference and measure the delay compared to all other channels (including your two subs)
Then you can use that value to calculate the delay for each speaker
You can also use REW's Alignment tool to make fine tuning but for me generally speaking the delay measurement usually works fine
Or you can simply use Dirac Live Bass Control to do all that for you but based on reviews/measurements that you can read here on ASR it actually does not do a decent job in the group delay department.....
This is a lot to digest I guess
so take your time
