Iḿ new in this forum and have been the owner of deqx hdp unit for few weeks . I have done a good 2 way diy system and measuring that was quite ok as a starting point.
I have tried versions of three way system where bass to mid crossover is around 180-200Hz, but frequency measurement accuracy inside is a problem.
Is the practice of integrating the normal woofer unit like dual sub woofers are integrated ok or common way to do it ?
Can single element measurements that have been done one by one integrated together ?
Then I noticed that in the user manual and on line help there is the measurements import wizard for MLSSA * .TIM files.
Measuring the bass with windowed impulse response measurement has limited accuracy to around 270Hz (far field measurement) .
If a near field measurement ( distance 5-15cm) is done from the mid axis of combined 2 woofers the low end can be measured.
The problem is the the merging of the near field and far field measurement correctly together in such way that the accuracy is maintained
in the way of the MLSSA .TIM format is requiring for the import wizard.
Has someone been measuring the impulse response with REW, ARTA, CLIO Pocket or HolmImpulse or similar
(this list because other or pro measurement systems are too expensive for hobby purposes) in such way that
the on axis 0 degrees near field and far field measurement could be exported for merging and joining together
(in MLSSA .TIM format) for deqx import wizard ?
Any examples of .TIM file format measurement files for DEQX ?
DEQX has analog devices dsp processors ( chip version is older)
-> some mlssa example files can be found in analog devices sigma studio install folder
another example: https://ez.analog.com/servlet/JiveServlet/download/6980-1-1955/X1-0D.TXT
(MLSSA has some linkage to IRMA - see here http://research.spa.aalto.fi/publications/theses/peltonen_mst.pdf )
Note from the DEQX 3.02 manual:
" In addition to the MLSSA “.TIM” format, text files in FRD format (textual frequency response) can also be imported. This is, however, intended only for comparative viewing of measurements, not for speaker calibration. Poor calibration results may be obtained if imported text files are used for calibration. "
Note from manual version 2.91 p122 states sample rate of 48kHz
Any examples of merging the near field + far field measurements together ?
Is the proposed "merger method" feasible and what are the possible compromises or errors ?
Anyhow here is measurement process export file capability proposal for DEQX :
- should be investigated further by expert weather this is feasible....
It would be great to have the capability to export from DEQX the impulse measurements into export file (example in the .TIM format)
and for merging the near field measurement and far field measurement together in 3rd part merger tool
/ reading the export/import file with third party analysis program. Currently in DEQX software there is already the MLSSA file import wizard
existing, that would be mandatory after the merging process of low frequency and high frequency part in 3rd part tool.
Potential benefit :
possibly a better combined measurement accuracy for inside measurements for 3 way system bass / mid ?
- worth investigating to improve ?
Merging frequency measurements together search
- Clio: Measuring loudspeaker low-Frequency Response , Testing Loadspeakers at low Frequencies with Clio
- VituixCad: the great Vituixcad merger tool: - see attached picture from it at the bottom of posting
Then the tweeter protection topic to enable some protection in measurements by crossing the (x) for 750Hz .
For me it seems to have small impact because measurements have measured signal trace from much lower frequencies even if crossing the tag.
Im using the latest measurement sw.
What is the recommended settings for having deqx analog R + L inputs as HT by pass from HT preamp to deqx and further to
power amplifier channels ? what level of volume setting recommended to deqx and how to keep it "in memory" ?
The best extra use case deqx manuals seem to be in japan in "deqx teacup cafe" but protected with user name & pswd.
Well even getting them does not help because written in Japanese. But I really admire the commitment of the Japan DEQX dealer to
have the deep commitment to support end users with saying that all Japanese DEQX users must be qualified as DEQX experts after the help and traing !
That is so humble and very Japanese approach.
I have created a linux hosted win 7 virtual machine where I can record HD quality video on linux side of the win client where there is the process
of creating a deqx configuration. When I get more guts and better sounding configuration I might make a video of the process ...
Would require the capability to import 2 MLSSA measurement files from DEQX for merging together im Vituix cad
and then exporting the results in a compatible MLSSA .TIM file for DEQX.
I think this is a good starting point joining to the forum. Topics above probably reveal that I did not use the "expert service" ...
And thanks to Almikel who helped me with some deqx user documentation already.
Greetings from up-and-over of Australia - on the other side of the globe !