Sweet Room is the basic parametric EQ feature provided by Devialet for the Expert Pro range with release firmware 13.2.0.
REW (Room EQ wizard) is the most often cited EQ software to use, probably because it is free.
I do not own a Devialet Expert Pro myself but I have dabbled with EQ over the years and was intrigued to read how Devialet had implemented this feature.
I noted that a fair few people started to enthuse about using the feature with a lot starting from scratch.
An exciting time, perhaps, but also one fraught with issues especially if you have little knowledge.
This is not a guide as there are plenty of them available across various HiFi forums including the Official REW forum hosted by AV Nirvana.
Rather, it is an explanation as to why I would choose Rephrase as the REW equaliser.
REW offers multiple equalisers, often for specific equipment or specific software as well as its own Generic option. This is because they use different methods or formulae to calculate each filter shape.
You can find more detail about the individual equalisers in the REW equaliser section of the User guide.
So, in the absence of a Devialet Expert Pro equaliser, which one is compatible with Sweet Room?
Devialet provided a PDF document as part of its introduction to Sweet Room and this included a number of EQ examples, beginning with a basic example upto an Advanced example. See attachment below.
This document helpfully provided screenshots, of the example filter shapes, taken from unspecified Audio Precision software. These screenshots were compared with those generated by REW for each of the group of REW equalisers until only one was found completely compatible.
Lets take the Basic example:-
100Hz, -6dB, Q of 10
Look specifically at where the 80Hz frequency and filter intersect.
Generic intersects at approx. -0.3dB
Rephase and Sweet Room intersects at approx. -0.6dB
[attachment=4321]
[attachment=4320]
Sweet Room EQ 100Hz, -6dB, Q of 10
[attachment=4322]
This indicates that the potentially compatible REW equalisers are those that calculate the parametric filter bandwidth in Hz between the half gain points as follows:
Bandwidth = sqrt(gain)*centre frequency/Q
That reduces the list of equalisers to the following:
- DCX2496
- UMC200
- 3sixty.3
- USM810
- Rephase
However, each of these equalisers have different resolutions for frequency, gain and Q values. Again, please refer to the relevant information as linked above.
Some of these limitations may be due to hardware or may be due to perceived auditory tuning etc. etc.
The greatest resolution is provided by Rephase and it is the only equaliser that can emulate all of the Sweet Room examples.
I hope this has been of help and is not full of errors.
EDIT: 22nd October
Mathieu Pernot has kindly confirmed my assumption regarding the REW Equaliser choice.
https://help.devialet.com/hc/en-us/artic...Sweet-Room
REW (Room EQ wizard) is the most often cited EQ software to use, probably because it is free.
I do not own a Devialet Expert Pro myself but I have dabbled with EQ over the years and was intrigued to read how Devialet had implemented this feature.
I noted that a fair few people started to enthuse about using the feature with a lot starting from scratch.
An exciting time, perhaps, but also one fraught with issues especially if you have little knowledge.
This is not a guide as there are plenty of them available across various HiFi forums including the Official REW forum hosted by AV Nirvana.
Rather, it is an explanation as to why I would choose Rephrase as the REW equaliser.
REW offers multiple equalisers, often for specific equipment or specific software as well as its own Generic option. This is because they use different methods or formulae to calculate each filter shape.
You can find more detail about the individual equalisers in the REW equaliser section of the User guide.
So, in the absence of a Devialet Expert Pro equaliser, which one is compatible with Sweet Room?
Devialet provided a PDF document as part of its introduction to Sweet Room and this included a number of EQ examples, beginning with a basic example upto an Advanced example. See attachment below.
This document helpfully provided screenshots, of the example filter shapes, taken from unspecified Audio Precision software. These screenshots were compared with those generated by REW for each of the group of REW equalisers until only one was found completely compatible.
Lets take the Basic example:-
100Hz, -6dB, Q of 10
Look specifically at where the 80Hz frequency and filter intersect.
Generic intersects at approx. -0.3dB
Rephase and Sweet Room intersects at approx. -0.6dB
[attachment=4321]
[attachment=4320]
Sweet Room EQ 100Hz, -6dB, Q of 10
[attachment=4322]
This indicates that the potentially compatible REW equalisers are those that calculate the parametric filter bandwidth in Hz between the half gain points as follows:
Bandwidth = sqrt(gain)*centre frequency/Q
That reduces the list of equalisers to the following:
- DCX2496
- UMC200
- 3sixty.3
- USM810
- Rephase
However, each of these equalisers have different resolutions for frequency, gain and Q values. Again, please refer to the relevant information as linked above.
Some of these limitations may be due to hardware or may be due to perceived auditory tuning etc. etc.
The greatest resolution is provided by Rephase and it is the only equaliser that can emulate all of the Sweet Room examples.
I hope this has been of help and is not full of errors.
EDIT: 22nd October
Mathieu Pernot has kindly confirmed my assumption regarding the REW Equaliser choice.
https://help.devialet.com/hc/en-us/artic...Sweet-Room
Quote:Hi Alan,
Your assumption is correct : the resulting bandwidth can be computed according to formulae n1 : bandwidth = sqrt(gain)*F/Q.
