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The release notes are hiding / not mentioning a lot here. Not only are the basic Dirac application issues fixed but there is a new version Dolby processing with Movie, Music and Night modes.
 

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New Firmware 1.32 Now Available

I am pleased to announce the availability of updated firmware for the JBL Synthesis SDP-55 / SDR-35, V1.32 / 0v590 here: https://p.widencdn.net/7mptit/JBLUpdate
or from either model product page: https://www.jblsynthesis.com/products/electronics/surround-processor-preamplifiers/SDP-55-.html


Dirac Live Bass Control is fully enabled. The Zip file includes both instructions and the "fix list." I believe you will enjoy the added functionality and much-smoother operation, allowing you to better enjoy the superior sound quality of the SDP-55/SDR-35.
 

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I am pleased to announce the availability of updated firmware for the JBL Synthesis SDP-55 / SDR-35, V1.32 / 0v590 here: https://p.widencdn.net/7mptit/JBLUpdate
or from either model product page: https://www.jblsynthesis.com/products/electronics/surround-processor-preamplifiers/SDP-55-.html


Dirac Live Bass Control is fully enabled. The Zip file includes both instructions and the "fix list." I believe you will enjoy the added functionality and much-smoother operation, allowing you to better enjoy the superior sound quality of the SDP-55/SDR-35.
Anyone tried Dirac BM yet? (As an Arcam user I'm not ready to spend $500 on it unless it works properly.)
 

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Anyone tried Dirac BM yet? (As an Arcam user I'm not ready to spend $500 on it unless it works properly.)
I'll likely give the full BC a shot before the weekend is over. Maybe tonight.

As of now, I used the lower level BC (Tier 1 or 2?) with the crossover selection with all my subs still calibrated by MSO on MiniDSP. This was with a calibration already complete. I don't notice too much of a difference so far.
 

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I'll likely give the full BC a shot before the weekend is over. Maybe tonight.

As of now, I used the lower level BC (Tier 1 or 2?) with the crossover selection with all my subs still calibrated by MSO on MiniDSP. This was with a calibration already complete. I don't notice too much of a difference so far.
Can you try with and without the Mini DSP? (Cant remember if you need more than 16 channels)
 

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Can you try with and without the Mini DSP? (Cant remember if you need more than 16 channels)
I do not.


And yes, that is the plan to try without the MSO/MiniDSP.

For now, I wanted to see how the crossover lower tier method worked (all my subs as one on MDSP). I don't hear a major difference. But, that's limited listening.
 

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I do not.


And yes, that is the plan to try without the MSO/MiniDSP.

For now, I wanted to see how the crossover lower tier method worked (all my subs as one on MDSP). I don't hear a major difference. But, that's limited listening.
Mine is sounding noticeably better with Atmos just because Dirac is being applied properly (Was listening to the Mumford & Sons Atmos Bluray)
 

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Though Amir is a smart guy he is naive about the real world of amplifier input sensitivities..
He pushes for a 4V standard yet the industry standard is significantly lower..
Typically the industry standard is 1V to 1.4V RMS, and the majority of consumer amplifiers built in Japan are 1V. Overdriving an input of an amplifier will increase its noise floor and force into clipping much too soon..
Also regarding amplifiers designed for pro-audio applications, these brands/products are now being used widely for home theater systems as they deliver a lot of watts per $. Note that some of the popular pro-audio amplifiers have switchable input sensitivities as such as 0.775V or 1.4V RMS. The key to having the best SNR is to closely match pre-amp out levels to amplifier input level specs. Just my $0.02... ;)
I did professional recording studio maintenance for over 30 years. I calibrated and serviced analog tape machines, mixing consoles, A/D and D/A converters etc. I have not done that work for ten years, but as far as I know, the pro audio standard is still 0 VU = +4dBu = 1.23 Volts. The old standard used dBm (https://en.wikipedia.org/wiki/DBm), but that ended a long time ago when they figured out you don't want to use 600 ohm transformers to optimize power transfer, you want to optimize voltage transfer and have low impedance outputs and high impedance inputs on audio devices. People may not know, audio was born out of the telephone company in the US and they thought they wanted to optimize power transfer and used impedance matching. When I first started working in recording studios (1976), there were a bunch of 600 ohm devices still in them. Now I really feel old, lol.

Anyway, I have no idea why Amir is using 4 volts or how that would affect his measurements in the Audio Precision equipment. Maybe he should ask Harman how they test their products and come up with published specifications. If the testing methodology is not the same, it would make sense that his measurement data might not be the same.
 

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Mine is sounding noticeably better with Atmos just because Dirac is being applied properly (Was listening to the Mumford & Sons Atmos Bluray)
I never noticed that problem. My front three were panning fine before.


I will say I haven't heard the chirp yet with atmos, so that's great.
 

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the pro audio standard is still 0 VU = +4dBu = 1.23 Volts.
As much as I respect Amir, when you perform multiple tests on a variety of products within a category and all of them fall far short of expectations, wouldn't it be reasonable to first evaluate your testing parameters? This just seems a natural procedure when applying scientific examination to any situation. (And the audio industry at large is clearly one that needs scientific examination.)
 

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Anyway, I have no idea why Amir is using 4 volts or how that would affect his measurements in the Audio Precision equipment. Maybe he should ask Harman how they test their products and come up with published specifications. If the testing methodology is not the same, it would make sense that his measurement data might not be the same.
This has been asked. Someone asked Amir about 4 volts on the Monoprice HTP-1 thread, this was the response: “ The whole world of consumer hifi has standardized on 4 volt output. Pro gear goes way above that. It seems like the AV manufacturers got together in a back alley and decided to shrink the output as much as they pleased.

I have $150 DACs that output 4 volt output designed by a single individual. When did this get "hard" as to want to relax the standard set in music world? ”


https://www.audiosciencereview.com/forum/index.php?threads/monoprice-htp-1-home-theater-processor-review.11416/page-5
 

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This has been asked. Someone asked Amir about 4 volts on the Monoprice HTP-1 thread, this was the response: “ The whole world of consumer hifi has standardized on 4 volt output. Pro gear goes way above that. It seems like the AV manufacturers got together in a back alley and decided to shrink the output as much as they pleased.

I have $150 DACs that output 4 volt output designed by a single individual. When did this get "hard" as to want to relax the standard set in music world? ”


https://www.audiosciencereview.com/f...w.11416/page-5
The link doesn't work, I would like to read what he has to say when I have more time.

Why is he using consumer level for equipment that has balanced pro level outputs?

The issue is operating level vs headroom/max output level.

Operating level is 0 VU = +4 dBu. Headroom is what the max output voltage is above operating level.. Most pro audio equipment has max +24 dB output, i.e. 20 dB of headroom.

Some high end mic preamps I used (Millennia Media HV-3D) have max output of +32 dBu. https://www.mil-media.com/HV-3D-8.html

You can calculate dBu to voltage here:

http://www.sengpielaudio.com/calculator-db-volt.htm
 
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