Maybe it’s OK but for a few dollars I was able to add some finned heat sinks on top using some thermo tape.
Haha, looks predatorily, like mohawk gremlin. Fosi should add some leds to it and sell as gamers edition
Maybe it’s OK but for a few dollars I was able to add some finned heat sinks on top using some thermo tape.
thanks!. But see, the THD doesn't change nowI exaggerated it a little so we can see the effect better and I included all values for better visuals.
So,at 1030Hz:
View attachment 382626
No fan
View attachment 382627
with fan
It's a little horror show.
What happens with the harmonics at the other charts are probably canceling,same as we do it deliberately combining the amplitude with the opposite phase.
It's random really,and that's the worst part of it.
It can be electrical noise too but yes,location changes the effect to the point of being insignificant if it's far enough.
Right on top or the bottom of the amp,is NOT far enough.
Thanks, I'll aim for around 10cm of distance between the fan and the amps.I exaggerated it a little so we can see the effect better and I included all values for better visuals.
So,at 1030Hz:
View attachment 382626
No fan
View attachment 382627
with fan
It's a little horror show.
What happens with the harmonics at the other charts are probably canceling,same as we do it deliberately combining the amplitude with the opposite phase.
It's random really,and that's the worst part of it.
It can be electrical noise too but yes,location changes the effect to the point of being insignificant if it's far enough.
Right on top or the bottom of the amp,is NOT far enough.
Yes,it's completely random.thanks!. But see, the THD doesn't change now
I may have to take back all my knit picks. I just installed my new Wiim pro and connected to Amazon music now the treble is back and dynamics are pushing the Vandersteens around like school yard bullies! And my God...the bass, the bass man. This is with no eq. Btw...I think there is some magic/synergy at work with the wiim and v3 monos (even more gain perhaps?). Gotta go listen to more tunes...Got my monos set up with dual 10A power supplies. This is replacing a noisy Behringer EP2500 (fans and power supply noise). The rest of the chain is: Turntable with Schiit Skoll phono and a Kara preamp. On the digital side I have a chromecast audio and a Schiit modi 3 (Wiim pro and an SMSL D6S on the way) all balanced connections. Speakers are Vandersteen 2Cs from the late 80s. The first thing I noticed was a super deep, black background, no noise whatsoever. The next thing I noticed was more bass as compared to the Behringer, but the sound was on the quieter side. Since I'm using XLR and am only getting 20db gain (Behringer was 34db gain) I realized I needed to tweak my gain settings on the preamps. Upon tweaking settings for a bit, I settled on Kara full gain mode and increased the Skoll gain from 40db to 47db. Now, this made everything more lively and woke up the V3 monos. I'm really enjoying the sound, but if I'm going to knit pick, the treble does seem more recessed and perhaps not as dynamic (darker overall) as the Behringer pro amp. (That thing rocked pretty good even if big, heavy and noisy). I'm attributing this to that the monos may be more neutral than the Behringer thus accounting for the difference. I have the Wiim pro coming soon so may play around with the EQ to get it to my flavor, as well. Anyone have any tips for getting more dynamics out of the V3s? Opamp swap possibly? (Also, I realize that the Vandersteens are pretty inefficient so may not synergize the best)
Here's my cooling solution, I'll get a 3d printed stand eventually, but a 200mm Noctua fan underneath the amps has done absolute wonders for the temps.
The amps went from being uncomfortable to touch to damn near stone cold. I'd highly recommend this setup if you want to keep the amps running cool.
There's a good article about it:Well, there are not one but two fans inside Audio Precision APx555, so I am sure there is a way to do it right.
View attachment 382707
They don't even look very fancy
More,here:While DC fans might appear to be electrically noiseless, they do produce acoustic and electrical noise. The different types of fans will incur produce their own types of EMI, creating difficulty in passing EMC tests. Even a DC-driven motor will produce EMI thanks to the spinning magnet used to attract and repel the rotor, producing strong switching noise during commutation. EMI generated from DC fans is normally limited to conducted EMI in the fan power leads (for 2 wire DC fans). This fan electrical noise is normally injected into the common ground, where it reappears at the output of any amplifier that drives the fan.
This is not to say that a DC fan does not produce radiated EMI, but the radiated EMI will be at the same frequency as the rotation rate due to uncontained magnetic fields (UMF) from the permanent magnet and stator windings. UMF exists in virtually all fans to some degree, but the first step in dealing with UMF is the responsibility of the manufacturer. Some manufacturers will place a thin steel enclosure in their fans to suppress UMF in at least two mounting planes. This means that radiated EMI is strongly dependent on the orientation of the fan.
Radiated EMI from UMF can induce a low frequency ripple current in a nearby high inductance circuit. Larger fans generally require stronger magnetic field for driving, thus they will exhibit stronger EMI at a given rotation rate. However, even at thousands of RPM rotation rates, the frequency of this radiated EMI will only be in the range of hundreds of Hz.
I have run a silent fanless PC for years and get components in the UK from https://www.quietpc.com/componentsCan EU members check where we can buy them at the best price I have seen some outrageous price gouging - anywhere in the EU we don't get shafted for import duties.
That was my initial intuition as well. However, as Fosi explicitly wants to use the entire case as a heatsink, it might actually make sense to do it this way (as it ensures maximum heat spreading over the entire case).It would be better if the additional cooler was glued to the bottom of the amplifier where the temperature is highest and turned completely upside down...
The housing and cooling of the chip are poorly designed, the cooler on the chip should have been on the upper side of the housing because it would have better removal of warm air.
Common sense would suggest that it would be better bolted at the bottom (with some longer screws,same with the ones used) and put to the side with the heatshink's fins looking straight up (as it intended to be the proper orientation) .That was my initial intuition as well. However, as Fosi explicitly wants to use the entire case as a heatsink, it might actually make sense to do it this way (as it ensures maximum heat spreading over the entire case).
You've apparently experienced a temporal anomaly!or those interested in such things, here's the shipment tracking info. When I got the notification that they'd been delivered I checked the front porch: nothing there. Checked all around the house, checked the neighbor's houses: nothing. As I was walking back up my driveway, a USPS van drove by. I flagged down the driver and showed him the delivery notification on my phone. He looked puzzled, then rummaged around in the back of his van and came up with my package. Don't know what that was about.
Combined with the SVS sub and metas that is a very well thought out system! You might consider a DSP to take it over the top?Ah, well then… SO much cleaner without all those fans cluttering the deck!
View attachment 382645
-Ed
Thank you; I have full 10-band PEQ plus various plugins like Balamce control in the DAP that I use as my streamer for room correction in conjunction with the DSP in the subwoofer.Combined with the SVS sub and metas that is a very well thought out system! You might consider a DSP to take it over the top?
Using fans inside an amp is not a good idea or having it driven from the amps electrical supply, that's why the papst supply comes from the dis. block. There is no acoustic noise as I stated, it's important to use a quality fan. Placing it below the amps and using the monos vertically with the pretty orange slats removed means the fan is operating at optimum efficiency.There's a good article about it:
More,here:
Cooling Fan Electrical Noise Reduction in Your PCB
Who hasn’t opened up their PC or laptop and taken a long look at its fans and heatsinks? If you’re working with high speed components, high frequency components, or power components, then you’ll need to devise some sort of cooling strategy to remove heat from these components.resources.altium.com