Hi guys! I was not around for several years. I see modding continues till this day. Great. :) Anyways, I found a way how to deal with crossover frequency, and some other things...but it would be an expensive and time consuming path to take. I still have some Z-5500 control pods at home which I...

@blue2010: Hm, I'm no expert but I would check opamp you changed for front channels. Try with old one. Check all traces, maybe there are some shorts. Also check the polarity of capacitors. There is some mistake around opamp, I would bet on it. Good luck!

@Kuro-Neko: You should try using sub output and direct it to front speakers. You can take the signal from last opamp in control pod from where sub channel is going to amplifer. If I'm not mistaken, that signal needs to be raised for 10dB. After you amplify it by 10dB, use another set of opams to...

@Kuro-Neko: very nice ideas! :)   You will not get anything if you access Z8. I mean, you will, but the main thing we should be getting access is DSP and it's crossover routines/filters and whatnot. I don't believe Z8 tells DSP how to cut frequency, I think that cutting the frequency is done...

Unfortunately I don't work with Zilog, no time to learn that too, but there is a possibility I could read the 37VF020. It would take a lot of time, but it's doable. If it's encrypted, we can do squat about it. Not sure why CS49400 would need it for it's operation, but I guess if you have it's...

Well, no, NJW1150 is not the culprit. It's a simple volume regulator, it can only modify bass/treble on front channels, so center and rear channels are not included, which rules it out. :)   I would say DSP is the one which cuts the frequency. Unless someone knows how to modify it's firmware...

@A-Force Yes, crossover is in control pod. There are some limitations to low frequency on TDA amp(used capacitors) and pre-amp is limiting some, but they are nothing compared to frequency cut which is coming from control pod. I suspect that DSP is limiting frequency, but currently i don't have...

@jayjayuk There are 3 main chips. DSP: Cirrus Logic CS494003 Volume control/ADC: Cirrus Logic CS42526 Volume control: New Japan Radio NJW1150   DSP is licensed and you will not find any info about it. CS42526 and NJW1150 are the things you can look into, but if you don't have no...

So, no feedback about crossover frequency? I hope someone will comment about it, I would really like some opinions.

Hello guys! :) I've registered so I can discuss about Z-5500 modding.   I too have one system ripped apart at home and doing testing and whatnot with it. My idea was to create entire new amplifier board with separate 6 amplifiers, using Control Center(pod) as a volume/input control and Dolby...