Hi Gents and possible Ladies?
Have a desire to try reprogramming the firmware on my JBL LSR 4300 speakers. The digital pcb display at a quick glance receiver and A-D-A converter capable of 24/192 PCM, but somehow, and I guess it is in the software controlling the speaker, there are limitations to 24/96 PCM.
Is there anyone here in this huge community of knowhow, who actually know how it all fits together, or even know how to "cure" this on purpose limited performance.
I tried the JBL expert support. They told me this software is JBL intellectual property. I agreed on property, but made my reservations clear for the other statement.
I am electro-engineer for high power distribution networks (MW and TW), so my insights in this micro-world is nothing worth mentioning. Any help is highly appreciated.
Thanks in advance!
Stefan from Sweden
Have a desire to try reprogramming the firmware on my JBL LSR 4300 speakers. The digital pcb display at a quick glance receiver and A-D-A converter capable of 24/192 PCM, but somehow, and I guess it is in the software controlling the speaker, there are limitations to 24/96 PCM.
Is there anyone here in this huge community of knowhow, who actually know how it all fits together, or even know how to "cure" this on purpose limited performance.
I tried the JBL expert support. They told me this software is JBL intellectual property. I agreed on property, but made my reservations clear for the other statement.
I am electro-engineer for high power distribution networks (MW and TW), so my insights in this micro-world is nothing worth mentioning. Any help is highly appreciated.
Thanks in advance!
Stefan from Sweden
Do you mean reprogramming this custom DSP https://i.imgur.com/ecFAJmF.jpg ?
Supporting 192kHz would most likely require hardware changes. Very likely your intention is unfeasible even if you had all the source code for all the programmable chips.
What would you gain? I doubt the integrated amp could go higher than some 30kHz anyway, the same for the tweeters.
Supporting 192kHz would most likely require hardware changes. Very likely your intention is unfeasible even if you had all the source code for all the programmable chips.
What would you gain? I doubt the integrated amp could go higher than some 30kHz anyway, the same for the tweeters.
I am not sure about the hardware changes, the critical componenets is specified to 24/192, such as receiver chip and A-D-A converter chip. The DSP is, too, working only at 32-bits floating so it would be better of by-passed.
Futher I use the HQPlayer to resample all digital streams, so I can set it to always go 24/192 irrespective of source and with so much better filter and dithering in HQP, it is on a cosmic scale. I know the first step, 16/44.1 is the most beneficial one, but adding some filtering headroom up to 192 will indeed add sonic performance. Several friends with DAC's för DSD clearly demonstrate the benefits with multiple oversampling and bit depth conversion. The algorithms is 64-bit floating so it is way better that the mid-fi DAC, which only offer a 32-bit and quite inefficient filtering in comparison. HQPlayer drains a I7 generation 8 at the filters I use, so I manage with an I7 9900, but would rather have an 10TH generation socket 1200 I7 or I9. These re-calculations is mind blowing on the SQ.
So, there it is ... 🙂
Futher I use the HQPlayer to resample all digital streams, so I can set it to always go 24/192 irrespective of source and with so much better filter and dithering in HQP, it is on a cosmic scale. I know the first step, 16/44.1 is the most beneficial one, but adding some filtering headroom up to 192 will indeed add sonic performance. Several friends with DAC's för DSD clearly demonstrate the benefits with multiple oversampling and bit depth conversion. The algorithms is 64-bit floating so it is way better that the mid-fi DAC, which only offer a 32-bit and quite inefficient filtering in comparison. HQPlayer drains a I7 generation 8 at the filters I use, so I manage with an I7 9900, but would rather have an 10TH generation socket 1200 I7 or I9. These re-calculations is mind blowing on the SQ.
So, there it is ... 🙂
Not mine, a trivial google image search 🙂
I do not think anyone except for JBL and their possible software-outsourcing partner does.
Since the device does a very advanced DSP, my 2 cents it resamples to a fixed samplerate via ASRC so that filter tables can be optimized. It can easily be 48kHz for any samplerate, lower or higher.
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Doesnt the amp and speaker produce so much noise and distortion that it can only reproduce much less than 20 bits resolution? So that you will gain absolutely nothing sonically from resampling?
Cheers!
Cheers!