Benefit from upping inductance in CLC?

[madskaman]

I've built a set of Aleph 3 amps, each with a CLC power supply. I've got 44000uf + 2.2mH (0.28ohm) + 66000uf on each rail. I'm considering upping the inductance to 3.9hH (.150ohm) - 6.8mH(.250ohm). I'll looking at erse 14ga inductors. Would I get any benefit from this?

 

[ticknpop]

Your wallet will be lighter, if you have back problems it may help.
Unless you have very high efficiency speakers it won’t do much.

 

[madskaman]

Thank you for the info. I've tried to model this in PSU Designer II without luck. Other than less ripple, I would end up with a slightly higher rail voltage. This may help me as well. I'm going to take some measurements tonight.

 

[trobbins]

I could get PSUD2 to simulate the supply - not sure what you have done to cause a problem.

Why have you increased the filter cap sizes from the original?

Are you performance testing by just using your ears, or is there some semblence of measurement being applied?

 

[johnhenryharris]

A larger inductor in a CLC power supply will reduce the ripple voltage but also may reduce your PS output voltage slightly. Your 2.2 mH is usually a good compromise between ripple reduction and voltage loss.

 

[Vovk Z]

The lower the inductance - the closer filter to "only C type" - the higher the voltage. But it is so only for LC-filter (which starts from L). For CLC filter - character depends from first C value.

 

[madskaman]

Thank you for the feedback. I ended up replacing the inductors anyway and I’m glad I did. The plastic was starting to melt and the inductors were deforming. I went with a larger gauge (14awg), larger inductance (10mH) and lower resistance (.250ohms) inductor. Upon initial listening, the background noise is audibly less. I can no longer hear anything from my seat when they are on. I wish I would have measured the before and after ripple.