QSC RMX 1450 fan replacement. Noise of old fan - 3:39 Noise of new fan - 28:32 Fan - NMB Technologies Corporation 3110SB-05W-B20-E00 80mm x 80mm x 25mm 19db www.digikey.co...
I haven't had problems with my fans other than not moving enough air quietly at 2 ohms lol. I did howeverrecap my Qsc EX amps. I did it just as an experiment to see what would happen since I actually thought they sounded fine at first. But when I pulled the original caps out they tested pretty low with super high ESR even cutting them open there was no electrolyte left inside.. it ended up sounding a lot better. Willing to bet a lot of if not most QSC MXa/EX amps need to be recapped.
My Adcom GFA-5800, that this QSC replaced, needs cap replacement worse than the QSC. Likely I will replace them in the QSC, but I had to get it quiet first.
@@stereoazimuth HA your video brings back a very funny memory from middle school that involves a QSC amp! I remember my last "pep rally" assembly in the gymnasium/auditorium at the Myrtle Beach Middle School. Full of students roughly 1000 students in each grade 6th, 7th, and 8th all in that same big ass gymnasium with school staff and whatnot all chearing at the top of their lungs. Well they had a systme with 1 QSC RMX850 with 3 15" 4ohm yamaha cabs paralleled on each CH, six in total off that RMX850, it was plenty loud to keep up with the kids but hahahah the assistant principal was up on stage holding a shopvacc to the exaust on the 850 to prevent it from going into protect.
@@HF-7DXM-6DXW-12 Sounds like one side of the amp was loaded down with 2 ohms, which the amp is not rated for and now I understand. Luckily many newer pro amps have this built in protection to protect from total meltdown/thermal runaway. I was not so lucky one time with the same thing to a cheaper Crown amp that did not have this protection, and also a feature not on many home hi-fi amps. But that is one thing I failed to mention in the video - this amp DOES have that protection and even if I am replacing with a lower CFM fan, the amp would still shut down if I asked it too much or overheated. Luckily it has stayed very cool that I am now buying another RMX 1450 to bi-amp my speakers.
Cleaned up my fan channel (different Amp, same design) still noisy.. Could just need a few components in line with the fan (thermistor) and wire it up, strap the thermistor to the channel casing (I have orig ones on bith sides, but theyre possibly for overheat protection)
Stumbled upon your video as I am undertaking a similar project for my home studio/ home cinema. Do you have any thoughts on what an acceptable temperature might be for a power amp such as Staline STA-225 or Crown XLS 1502 (the 2 amps I already own) The amp will only be driving a pair of bookshelf wharfedale Evo 4.S rear surro8und speakers, so I started wondering if if might be ok to disable the fan entirely? Thanks!
Any amp probably should stay under 55C. Meaning 55C (131F) should be max. This is at the case. At 60C (140F), you can almost get burned in just a second or two by touching.
Hey thanks for the video man. If I wanted to just turn the fan off on my Yamaha p1600 can I just disconnect the fan and good to go? It will have ventilation. It’s rated at 150w rms at 8ohm per channel and it’s powering Yamaha ns10’s in my studio (60w -120w max rms 8ohm) and won’t be running very loud.
Many amps have thermal shutdown if it gets too hot in case of fan failure. I would still be cautious and get a $25 IR temp sensor and check the case temp from startup and make sure it’s not going over 40C or so. 50C is bad and 60C is dangerous. If after an hour at normal operation and still between 30-40C, you should be fine. That particular amp has all the heat sink on the left side (when looking at the front), so monitor that side.
Hi good day I'm having a problem with my QSC 1450 house amp it buzz when I'm turning it on switching it on and the red light is on for a little while can you tell me what's the cause of that and can I fix it for myself thank you
If the buzzing is faint and you unplug the source and it goes away, it is a ground loop issue. If the buzzing happens with nothing plugged in, it likely means one of the filter caps has failed. There are 4 on each side of the board...4 for each channel basically. I would replace all 4 with the same size and value. However, I am no means an amp repair pro.
Very impressive! I have (a US made) old school PV-4C that's louder than Linda Lovelace ....
Good video sir
I haven't had problems with my fans other than not moving enough air quietly at 2 ohms lol. I did howeverrecap my Qsc EX amps. I did it just as an experiment to see what would happen since I actually thought they sounded fine at first. But when I pulled the original caps out they tested pretty low with super high ESR even cutting them open there was no electrolyte left inside.. it ended up sounding a lot better. Willing to bet a lot of if not most QSC MXa/EX amps need to be recapped.
My Adcom GFA-5800, that this QSC replaced, needs cap replacement worse than the QSC. Likely I will replace them in the QSC, but I had to get it quiet first.
@@stereoazimuth HA your video brings back a very funny memory from middle school that involves a QSC amp! I remember my last "pep rally" assembly in the gymnasium/auditorium at the Myrtle Beach Middle School. Full of students roughly 1000 students in each grade 6th, 7th, and 8th all in that same big ass gymnasium with school staff and whatnot all chearing at the top of their lungs. Well they had a systme with 1 QSC RMX850 with 3 15" 4ohm yamaha cabs paralleled on each CH, six in total off that RMX850, it was plenty loud to keep up with the kids but hahahah the assistant principal was up on stage holding a shopvacc to the exaust on the 850 to prevent it from going into protect.
@@HF-7DXM-6DXW-12 Sounds like one side of the amp was loaded down with 2 ohms, which the amp is not rated for and now I understand. Luckily many newer pro amps have this built in protection to protect from total meltdown/thermal runaway. I was not so lucky one time with the same thing to a cheaper Crown amp that did not have this protection, and also a feature not on many home hi-fi amps. But that is one thing I failed to mention in the video - this amp DOES have that protection and even if I am replacing with a lower CFM fan, the amp would still shut down if I asked it too much or overheated. Luckily it has stayed very cool that I am now buying another RMX 1450 to bi-amp my speakers.
Cleaned up my fan channel (different Amp, same design) still noisy.. Could just need a few components in line with the fan (thermistor) and wire it up, strap the thermistor to the channel casing (I have orig ones on bith sides, but theyre possibly for overheat protection)
Yes, you will need to use different ones that are also rated higher so the fan actually kicks on when you need.
2000rpm is key here
Stumbled upon your video as I am undertaking a similar project for my home studio/ home cinema.
Do you have any thoughts on what an acceptable temperature might be for a power amp such as Staline STA-225 or Crown XLS 1502 (the 2 amps I already own)
The amp will only be driving a pair of bookshelf wharfedale Evo 4.S rear surro8und speakers, so I started wondering if if might be ok to disable the fan entirely?
Thanks!
Any amp probably should stay under 55C. Meaning 55C (131F) should be max. This is at the case. At 60C (140F), you can almost get burned in just a second or two by touching.
Hey thanks for the video man. If I wanted to just turn the fan off on my Yamaha p1600 can I just disconnect the fan and good to go? It will have ventilation. It’s rated at 150w rms at 8ohm per channel and it’s powering Yamaha ns10’s in my studio (60w -120w max rms 8ohm) and won’t be running very loud.
Many amps have thermal shutdown if it gets too hot in case of fan failure. I would still be cautious and get a $25 IR temp sensor and check the case temp from startup and make sure it’s not going over 40C or so. 50C is bad and 60C is dangerous. If after an hour at normal operation and still between 30-40C, you should be fine. That particular amp has all the heat sink on the left side (when looking at the front), so monitor that side.
Thanks for the detailed reply man!
Hi good day I'm having a problem with my QSC 1450 house amp it buzz when I'm turning it on switching it on and the red light is on for a little while can you tell me what's the cause of that and can I fix it for myself thank you
If the buzzing is faint and you unplug the source and it goes away, it is a ground loop issue. If the buzzing happens with nothing plugged in, it likely means one of the filter caps has failed. There are 4 on each side of the board...4 for each channel basically. I would replace all 4 with the same size and value. However, I am no means an amp repair pro.