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Old Yesterday, 07:24 AM   #651
LeaUK is offline LeaUK
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Join Date: Oct 2018
Thanks you Kimmosto

As you can probably guess, I'm struggling to locate novice instruction for ARTA (there is so much to take in) so quality of documentation is paramount and hence I have been looking at REW (and of course it's free - amazing! which is useful to get on board).

I notice REW does support semi-dual reference so that's also perfect for getting started, but allows just that little edge, timing of the OS response (due to my old lappy) could be important and snippets of information regarding this has really helped me build the BOM for this projects thank you.

I'm concerned that I'm hogging the thread a little and have gone slightly off topic so please do simply nudge me and I'll head over the the main forum, but again it's really appreciated, and being able to discuss with the actual designer is truly mindblowing.

For now the BOM is as you've recommended but maybe REW (in speaker testing mode), lots of quality documentation and much in novice format ;-)

I've learnt so so much, thanks.

Lea
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Old Yesterday, 09:26 AM   #652
kimmosto is offline kimmosto  Finland
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Quote:
Originally Posted by 3ll3d00d View Post
You can use rew for this job...
I'm aware of everything you wrote but wasting of time is evident if off-axis set is 0-180 deg with angle steps of 5 degrees, and speaker is multi-way. My typical measurement sequence is only 19 off-axis measurements per driver, but sometimes 37 directions is valuable.

I use CLIO which has root filename + automatic numbering and support for motorized turning table. ARTA has also off-axis measurement sequence with pause timer which is very handy with manual turning table.

So, I will never use REW or recommend to others as long as automatic naming with root filename + numbering is missing - despite of $0 price tag.

One thing not yet mentioned is 'Conversion IR to FR' in VituixCAD. It supports CLIO mls and ARTA pir files but not REW mdat. That might be possible to add, but will not happen without public binary file spec.
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Old Yesterday, 10:22 AM   #653
3ll3d00d is offline 3ll3d00d  United Kingdom
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It seems a trivial time cost to me but each to their own. Anyway point is that one can use rew to produce data for vituixcad and achieve good results so if unwilling or unable to spend money on arta then it is a good way to go.
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Old Yesterday, 12:18 PM   #654
kimmosto is offline kimmosto  Finland
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^OK, but someone else might be sad or angry if new off-axis measurement sequence (3x37) is needed due to wrong mic location or bad setting in measurement program or amplifier etc. Freeware or crack makes software products golden
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Old Yesterday, 01:55 PM   #655
3ll3d00d is offline 3ll3d00d  United Kingdom
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Use at your own risk

On that note, there is one key difference IME between REW and ARTA and that is the way the window is specified relative to the peak vs the arta approach of picking some absolute sample positions to apply to all measurements. If the position of the peak never moves then this is a non issue but if it does, and I think some measurement setups will be prone to this, then it is something to bear in mind (i.e. may need manual adjustment).

The other difference is that REW is prone to producing some rather large txt files which can things a bit slow to load/manipulate.
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Old Yesterday, 03:30 PM   #656
kimmosto is offline kimmosto  Finland
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^Reference time moving (peak searching) for each measurement is not a problem with REW because we can easily apply common time window settings to all measurements before exporting to txt/frd. BUT that does not remove phase response wrapping which forces us to export txt/frd files with "resolution of measurement". That creates huge files with e.g. 128000 data rows.

The other option is to adjust "t=0 offset" for each measurement to enable e.g. 48 or 96 PPO txt/frd export without damaging phase data. That action would take some time if you have 3x37 off-axis measurements in the project.

This is one quite good reason why no one should use REW for speaker designing imo.
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Old Yesterday, 07:52 PM   #657
LeaUK is offline LeaUK
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Join Date: Oct 2018
And then I found this similar combo...

Compact-Studio-Monitor

I might model this xover design for mine just to see. More importantly, all measuring parts and cables ordered today, longest lead time seems to be the Mic, hopefully next weekend the fun begins 👍 Even found a 0.1% 100R metal film and crock clips to build the impedance measurement probe circuit...
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