microRendu General Thread

A post was split to a new topic: Sonicorbiter 2.5 operating system

I don’t think a lot of people are willing to try such complicated systems. I can tell you most of our users don’t like science projects and are using the unit as is because they are satisfied with the sound they get.

Anyone know why microrendu doesn’t have an optical out? Would it pay to put it through a usb-optical converter, or have sonore already taken steps to quieten and isolate the USB connection?

The USB output on the microRendu is very quite. It has a very low noise power supply and precision timing to reclock the USB signal.

With most DACs you will get the best sound out of your DAC with the microRendu attached to the USB input.

If your DAC doesn’t have a USB input or the SPDIF input is better then the USB input (true on some older DACs) Then a USB to SPDIF converter is a good solution.

If you are interested in isolation, some people are using ethernet to optical or usb-optical solutions


USB to S/PDIF solution.

Yep I guess this is exactly what I was asking…

Has anyone tried the 7.5v kingrex battery power supply, to power the microRendu? It seems a bargain, and I’m wondering if disconnecting from the mains entirely would further improve the sound, albeit by having to keep recharging the battery…

It says in the specs it’s 5v out. You would need 7.5v - 9v out to power the microRendu.

Nope. It’s definitely primarily 7.5v out. It also has a secondary 5v usb out, for usb powered devices, but I don’t think you can use both outputs simultaneously…

If it has 7.5v out it should work well with the microRendu.

Took the plunge and bought one as I found one on clearance. Will report back…

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I used batteries for a while on the mR. They have a very low noise floor. I noticed improved dynamics when I swapped in the LPS-1.

Makes sense. Do you happen to know what the current rating of your battery setup was? The 2.6A of this battery setup seems like overkill for the microRendu, so plenty of headroom for dynamics in thinking… (?)

They both had heaps of current capability, one even had little battery clips to start a car with. When I mentioned I was using batteries to a smart electronics friend he muttered something about the impedance being all wrong; I have no idea what he meant.

Batteries sounded better than mains to me, but the LPS-1 was a step up in dynamics.

OK, some feedback here, for anyone interested… Upower by kingrex works fantastically well with microrendu, in my opinion, and no problem with lacklustre dynamics, either, in my view…music is infinitely more involving and very much more resolved than with ifi…cant compare with lps-1, as I don’t have one: all I know is that I got this for way less than half the price of lps-1, and I’m very happy…battery easily covers my longest listening sessions, and I just recharge when I go to bed…

I think I’m a battery convert.

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Think of a very large power reservoir. The question is: how quickly can you change the amount of current it delivers. You might be able to get a lot of current but ramp up slowly. Or the reservoir might be able to deliver current very very quickly, but not necessarily a lot of current in the steady state. If you translate that to audio, the power supply needs to deliver current changes quickly in the audio band. That is how the voltage is kept constant when the demand increases. A car battery is probably very slow in this region of frequencies but probably pretty good in very low frequencies. When a supply is very fast at a given frequency, the terminology is the impedance (which is like a resistance that depends on frequency) is LOW. This is good for current delivery.

The LPS-1 has very low impedance in the audio frequency and possibly higher frequencies. A battery is not necessarily as fast.

Makes sense?


Very clear. Thanks.

And by the way, this is why you would add capacitors in a power supply: they are very fast at delivering the current they stored but obviously run out of current quickly and need to be replenished. So you can replenish slowly from a car battery but have fast delivery from the intermediate “fast” reservoirs. Simplifying it a lot, this is how an LPS-1 works.