Paul Posted October 15, 2005 Share Posted October 15, 2005 Fixed with an extra fan Quote Link to comment Share on other sites More sharing options...
MrMcGoo Posted October 15, 2005 Share Posted October 15, 2005 The Pioneer 47TX is a class AB amp. It as no fan, but instead uses a large internal heat sink. The amps are MOS-FETs. The amp runs hot unless it is well ventilated. Eight inches of clearance over the amp are required for air circulation. Low impedance loads also make it run hotter. Klipsch speakers may not always be true 8 ohm speakers, but merely 8 ohm compatible. Woofers are typically around 4 ohms. Since bass frequencies require more power to reproduce, the Pioneer's amps are required to put out quite a bit of current. The Pioneer is designed to run 8 and 6 ohm speakers. Pioneer recommends against 4 ohm speakers. Bill Quote Link to comment Share on other sites More sharing options...
MrMcGoo Posted October 15, 2005 Share Posted October 15, 2005 The picture is of the European version of a similar Pioneer. The chimney heat sinks are in the middle of the receiver. Quote Link to comment Share on other sites More sharing options...
Paul Posted October 15, 2005 Author Share Posted October 15, 2005 I have mine sitting on the top of the rack so thers nothingabove it,after watching one movie it is very hot to touch when i put my hands on the top of the case,Is this normal?,Does yours or other owners of this reciever do this,i run lasclas for the mains,i am surprized they put no fan inside the case for cooling,You would think the internals would start to break down after years running this hot,I just might get a cooling fan for the top to suck hot air out. Quote Link to comment Share on other sites More sharing options...
MrMcGoo Posted October 15, 2005 Share Posted October 15, 2005 The 47TX, 49TX and 49TXi all run a bit hot. The 59TXi runs cooler. If you cross the LaScalas over to a subwoofer at 80 Hz, there will be a little less heat. No fan was used to reduce noise on the Pioneers. Some NAD receivers use 3 fans and can be noisy. I would not worry unless the Pioneer is too hot to touch. If that is happening, then an outboard power amp will reduce power requirements and heat. I run outboard amps on RX-7s, which are a much more difficult load than LaScalas. Bill Quote Link to comment Share on other sites More sharing options...
Marvel Posted October 15, 2005 Share Posted October 15, 2005 A fan could help out a lot. You should then probably check the internals every so often to make sure you aren't getting dust buildup on any of the components. With convection cooling this isn't as much of a problem, but forcing air through the amp will pull more into it. Not acusing you of a dusty house, it's just the way things work. We have a computer at work that is located in the grounds keeper's office. Right off the garage. Dirt and dust are rampant. Went to do some work on it a few years ago, and after it had been in operation for only about a year the case had a half inch of dirt in it. We had a large box made with a good sized fan and filter on it to place the pc in. Cables come out through a slot in the back of the box and there is a door on the front. The fan blows IN, creating positive air pressure in the box. That way we didn't have to seal around the cables and front door. After several years of running, the pc is still clean. They just replace the filter material every so often. Bruce Quote Link to comment Share on other sites More sharing options...
Paul Posted October 15, 2005 Author Share Posted October 15, 2005 No i was going to run a fan on the top sucking heat out. Quote Link to comment Share on other sites More sharing options...
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