I run a fan on an amp at such a low rpm and airflow rate, that if it’s power supply is unplugged, it stalls out. It’s a small 12V fan running at approx 4.1V DC. When I plug it in, I have to touch one of the vanes to start it by hand. That is what you call the ’just above stalling’ voltage for the 12VDC fan. Each will be different.
It’s ’just enough’ air flow to move the air away from the heatsinks, and no more. The running temp drops by a good 20-30 degrees.
You can also buy a 12V fan speed controller from a computer shop. One that is all passive, just resistors and a few switches. That would have the least level of interference in your audio equipment.
Do not, I repeat, do not buy a PWM electronic controller of any sort. Buy a small unpowered passive one that uses resistors and is meant to go ’in line’ (in series) with the DC power line for the fan, and uses simple switched resistors to vary the loading or current/voltage that the fan has access to.
The problem is that the passive/resistive/switched fan speed controllers have all died away for the more expensive and ’egotistically more stroking’ expensive electronic ones with switches, big panels, tons of parts, LCD displays, lights, alarms, knobs, etc. This kind of poorly implemented (pulse power supplies, PWM voltage control, and electronic added noise) device is fine for computers (where the entire box is almost pure electrical and RFI noise) but absolutely terrible for high end audio.
You’ll have to search out a simple passive switched fan speed controller, that will have only a few speeds available to you, via the switches, and that’s usually slow, medium, and fast. they are difficult to find as ’passive’ type speed controllers are not cool and complex, and are considered passe and cheap. There is a good amount of them out there, but their specs and build are mostly hidden away from eyes, due to human perceptions about quality.
This kind of simple device:
https://www.newegg.com/p/376-0020-00007
Which is fine, if the cooling considerations you reach for... does not have an electrical system that does not destroy the sonic qualities you are trying to hold on to.
There are some that have simple amplifier circuits and are not PWM modulated, but this will take some discernment on the part of the buyer, to understand which is which.
It’s ’just enough’ air flow to move the air away from the heatsinks, and no more. The running temp drops by a good 20-30 degrees.
You can also buy a 12V fan speed controller from a computer shop. One that is all passive, just resistors and a few switches. That would have the least level of interference in your audio equipment.
Do not, I repeat, do not buy a PWM electronic controller of any sort. Buy a small unpowered passive one that uses resistors and is meant to go ’in line’ (in series) with the DC power line for the fan, and uses simple switched resistors to vary the loading or current/voltage that the fan has access to.
The problem is that the passive/resistive/switched fan speed controllers have all died away for the more expensive and ’egotistically more stroking’ expensive electronic ones with switches, big panels, tons of parts, LCD displays, lights, alarms, knobs, etc. This kind of poorly implemented (pulse power supplies, PWM voltage control, and electronic added noise) device is fine for computers (where the entire box is almost pure electrical and RFI noise) but absolutely terrible for high end audio.
You’ll have to search out a simple passive switched fan speed controller, that will have only a few speeds available to you, via the switches, and that’s usually slow, medium, and fast. they are difficult to find as ’passive’ type speed controllers are not cool and complex, and are considered passe and cheap. There is a good amount of them out there, but their specs and build are mostly hidden away from eyes, due to human perceptions about quality.
This kind of simple device:
https://www.newegg.com/p/376-0020-00007
Which is fine, if the cooling considerations you reach for... does not have an electrical system that does not destroy the sonic qualities you are trying to hold on to.
There are some that have simple amplifier circuits and are not PWM modulated, but this will take some discernment on the part of the buyer, to understand which is which.