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|25th November 2009, 02:55 PM||#1|
Join Date: Nov 2009
ARTA - using ARTA to measure room acoustics!
Hello Once again....
I have been able to start my testing with ARTA . However – I have millions of questions on how to use it best and get reliable results. I should also mention that (At the moment) I only use it to measure the sound in my listening room – to optimize my room correction algorithm and acoustical tratments (absorbers, HelmHolz etc)
Since there will be a lot of questions in this post – I will assing each of them with a number for reference!
So – I am trying to get the best possible sound from my HiFi system. This system is currently composed by:
*PC (JRiver music player, Convolver VST plug-in with FIR room correction and XO filter)
*Lynx AES 16e PCI soundcard with 8 channel digital I/O
*Digital Audio Denmark AX 24 – 6 channel DA convert and 2 channel Mic preamp/AD
*3 x Dynamic Precision DP A1S EBW (Norwegians amps, excellent specs and bandwith)
*Overkill Audio Finale loadspeakers (12`sealed enclosere, 10`open baffel, Manger head units)
Acoustical treatment – 2 x Svanå V6 + 2 x V4 HelmHolz resonators
And lots of absorbers that might make its way into the living room!
For measurements I use a EarthworksM30 connected to the Micpreamp of the AX24(which is SOTA)
Some pictures of the set up:
Amps, DAC and Helmholz and diffursors from Svanå
The way I usually listen....
The rest of the room (and a couple more HelmHolz)
OK...so I hope this thread can be a «how to» and sharing experiences» with the ARTA acoustic software.
All my measurements are taken in the sweetspot!
As far as I understand you can retrieve pretty much every analysis from the impulse respons.
And I have been able to record the impulse respons with this set up:
1)Is this the most accurate/best way to record the impulse respons?
I used this to create the two most «interesting» measurements for my set up:
Cumulative Spectral Decay
2)Does my CSD look OK ?
(I had expected decay time difference to be much larger between low frequencies and high frequencies. I had also expected to see standing wawes much clearer!)
Another graph I was very interested in was the reverbation times:
3) Does this look OK (I did naturally expect some of the same behaviour as for the CSD – and I am very suprised that it actually falls below 300 Hz)
4)My forth questions is about drivers.
I am using digital crossovers in my system – so in another program I am using (Audiolense – which creates the FIR filter for my correction) I can use ASIO drivers – and do partial measurement for each output! Typically when doing a frequency sweep the outoput will be:
Output 1 – left channel DC-150Hz
Output 2 – Left Channel 150-700 Hz
Output 3 – Left Channel 700-25000Hz.
And 4,5 and 6 for rght channel...?
Is such a set up possible in ARTA...?
If not – I will have to rout the output thru a digital loop with crossovers – and that causes quite a lot of latency!
Any feedbacks are welcome!
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