Topic: M32 DA/AD PRO, Heat And Noise Question

I got a new M32 AD/DA PRO System, and as i hooked them both up, they startet Ventilation about half an hour later. The processors of the units went up to 74 on the one and 69 Degrees on the other unit, without sending any Audio signal through.  They feel very hot from the outside as well. They were connected to my UFX+ by MADI.

I just want to ask if this is kind of normal, and if there is any solution for less fan noise, maybe adjustable RPM or turning them off temporary for Mic-Recordings.

These M32 units are really amazing pieces ofi Hardware and I love them already, but this issue would be great to fix, if possible.

Thank you.

2

Re: M32 DA/AD PRO, Heat And Noise Question

32 channels plus network processing in a 1U height enclosure won't work fan-less. You can reduce upheating by making sure the enclosure has free space around it, either by using higher feet, or leaving a bit space to other units within a rack.

BTW, there is a firmware update on our website's download section.

Regards
Matthias Carstens
RME

Re: M32 DA/AD PRO, Heat And Noise Question

Thank you.

Yes I saw the update and installed it. I am already leaving space between the units, and was wondering about the heat with no audio floating through it, but I think that staying in sync needs to be calculated by the processor, even there is no signal, right? I just want to understand;) Btw. The UFX+ is processing a lot more audio in my case.

I don't know how hot it can get but is there a thought about more manual control on the fan in further updates?

I think the  M16 AD/DA is without a fan, is this right?

4

Re: M32 DA/AD PRO, Heat And Noise Question

Audio or not does not change the power consumption significantly.

I will ask about manual control.

The M16 has no network processing, half the channels and double the enclosure size - then it works without a fan  wink

Regards
Matthias Carstens
RME

Re: M32 DA/AD PRO, Heat And Noise Question

The M-32 Pros are getting quite hot due to the following design decisions:
- true balanced circuitry, involving 4 op amps per channel
- line level of +24 dBu, which require analog voltages of +/- 15V
These on the other hand are among the most important features of this series, so we didn't want to make any trade-offs there.
Moreover, as MC already mentioned, about 20% of power consumption stems from the network processing engine (which also provides other features and cannot be turned off).
The fan is therefore required to stay within the specified temperature range of all parts.

However, during development, we did intensive testing in case of fan failure. We found that even if the processor temperature went up well beyond the specified limit, the unit continued stable operation over many hours.

Of course we cannot and will not recommend that. Thermal design of rack units is tricky, there are countless scenarios where the units could be installed. So if we add an additional "fan off" mode, it will have be a "we take no responsibility whatsoever and you are required to monitor the temperatures on your own"-mode.

Let me discuss that within our team, let's see what we can do.

Re: M32 DA/AD PRO, Heat And Noise Question

Thank MC and Marc,

@MC you are right of course: choosing an M16 for fan only feels like living in the past, and not so good;)
Maybe a second UFX+ with less IN/Out then, is an option, if the fan noise is annoying too much, just thinking...any other thoughts?

@Marc:
I got that and it totally makes sense.
But it would be great to turn them off for recording, otherwise I think it can be an issue in some studios.

I was thinking about a "fan-off timer" that turns it off for 30 minutes or a specific time range, so you can't forget about that.
Or deactivating the fan with a "critical threshhold value", where the fan necessary has to start again to avoid damage.

Maybe choosing manually fan speeds can be a big advantage, as you watch the temperature and get your workaround with that, if lower RPM-values are doing almost the same in your setup.
For me It feels like the fan is not regulating that much for the action it does, but I can only compare to running with no fan, so its just a non-objective opinion on that point;)

Re: M32 DA/AD PRO, Heat And Noise Question

Please note that it is a bit of a contradiction to build a super low noise design and then add a fan, at least in case the device is running in the same room where monitoring or recording takes place - and yes, there are many nice applications for these devices just in such rooms.
So I support requests for reliable non-fan mode. Not possible to partly reduce functionality in order to reduce power consumption? Can an alternative housing (e.g. with many vents) help?

Re: M32 DA/AD PRO, Heat And Noise Question

I was always interested about M Pro series with heat and fans but decided to wait out and watch.  I totally get that they are designed for more broadcast scenarios that imply machine rooms etc.  For the time being the Micstasy/ADI8-QS combo is still quite a high spec and silent combo.  What it loses in perceived quality in comparision to M Pro or later Focusrite Rednet I cannot say as I have never compared.  But at least in my situation the only time I ever wrinkled my nose at the RME was the (utilitarian) Madiface XT headphone DAC vs Merging Hapi, when switching from one to the other.  In the true actual pre/adc/dac dept, I am still very happy.

Madiface XT, Madiface, 3x Micstasy, ADI8QS
Sequoia 14,  W7Px64, W10Px64

Re: M32 DA/AD PRO, Heat And Noise Question

Yes, it's true, the ADI 8 QS works without fans and noises, but we should not forget it's now a 12-year-old product.

Re: M32 DA/AD PRO, Heat And Noise Question

Ulrich wrote:

Please note that it is a bit of a contradiction to build a super low noise design and then add a fan, at least in case the device is running in the same room where monitoring or recording takes place - and yes, there are many nice applications for these devices just in such rooms.
So I support requests for reliable non-fan mode. Not possible to partly reduce functionality in order to reduce power consumption? Can an alternative housing (e.g. with many vents) help?


Yes I Think the same. Maybe kind of a "power sheme" is a good point, where the Units run in minimal mode like 16 Channels only, no Network for example. I think right now there is nothing comparable on the market. The sound quality is outstanding in my opinion and switching (back) to an 12 year old device is no proper solution because of ventilation;)

@Matthias, maybe you also can come up with this approach, beside the "manual control"- idea, when you're talking with RME guys;)