Marvel Posted July 1, 2005 Share Posted July 1, 2005 I think that model is around 21 db-a. Anything in that neighborhood would be quiet enough. I have some old fans I took out of some Digital Equipment Corp. power supplies. They don't build them like THAT anymore. Ball bearing fan assemblies. Very quiet and should last a long time. Most pc fans are sleeve bearings, and they wear out too quickly. Quote Link to comment Share on other sites More sharing options...
Duke Spinner Posted July 2, 2005 Share Posted July 2, 2005 Sooo.... people are discovering Pro-Sound stuff, eh ...?? Lotsa Crowns don't use fans ... 200/400/600 watt Com-Tech's, 1000 watt K-1, 2000 watt K-2, for example i use 3 com-techs in my Rig ... Quote Link to comment Share on other sites More sharing options...
Marvel Posted July 2, 2005 Share Posted July 2, 2005 I have two Alesis RA-100 amps. 100 wpc into 4 ohms. No fans at all. They don't make the model anymore, and you can pick them up on ebay for cheap. I know there are lots better SS amps, but it is pretty clean. Mine never even get more than warm. The new QSC amps would be great though, due to the newer PS design. Quote Link to comment Share on other sites More sharing options...
Duke Spinner Posted July 2, 2005 Share Posted July 2, 2005 Alesis makes Great stuff... at a decent price .... Quote Link to comment Share on other sites More sharing options...
DrWho Posted July 2, 2005 Share Posted July 2, 2005 If I had the money I would really wanna give these amps a demo: They have a 200 watt version (shown, $279) and a smaller/cheaper 100 watt version ($219). Here's the digi-key list of fans: http://dkc3.digikey.com/PDF/T052/1418-1426.pdf I couldn't find the panasonic panoflo fans in the listing though... Btw, what is this dBa rating? Is it basically how loud the fan is per amp? (ie, a 21dba fan is 42dB loud when driven with 2 amps?) Quote Link to comment Share on other sites More sharing options...
tigerwoodKhorns Posted July 3, 2005 Author Share Posted July 3, 2005 Here's the digi-key list of fans: http://dkc3.digikey.com/PDF/T052/1418-1426.pdf I couldn't find the panasonic panoflo fans in the listing though... Btw, what is this dBa rating? Is it basically how loud the fan is per amp? (ie, a 21dba fan is 42dB loud when driven with 2 amps?) ---------------- I can't find the fan. The QSC needs a 80mm x 80mm x 25mm 24 volt fan. From what I read, it comes with a panaflo "h" for high flow and needs an "L" for low flow. There are a lot of 12v fans for computers, but not many 24v fans out there. Can a resistor or some kind of easy mod be done to lower the fans level? It is pretty quiet except for when the room is silent. I took a reading with a rat shak meter. No reading at one foot. When I put the meter right up to the grill I registered in the mid 50's for db. Any help is appreciated. I just love this amp. Chris EDIT: OK I just go thtis info: Panaflo FBA08A24L 80 mm 24vdc .09a Panaflo FBA08A24H 80 mm 24vdc .17a It seems that the only difference is that the H uses .17a and the l uses 0.09a (1/2 of the H) I forget the formula. It is v= I/R right (its been a long time since engineering school!) If that is correct, if I double the resistance, the V is constant so "I" should drop to 1/2 of the amperes. the only problem is that I need to measure the resistance of the fan now. Is this correct? Quote Link to comment Share on other sites More sharing options...
meuge Posted July 3, 2005 Share Posted July 3, 2005 ---------------- On 7/3/2005 11:14:21 AM tigerwoodKhorns wrote: EDIT: OK I just go thtis info: Panaflo FBA08A24L 80 mm 24vdc .09a Panaflo FBA08A24H 80 mm 24vdc .17a It seems that the only difference is that the H uses .17a and the l uses 0.09a (1/2 of the H) I forget the formula. It is v= I/R right (its been a long time since engineering school!) If that is correct, if I double the resistance, the V is constant so "I" should drop to 1/2 of the amperes. the only problem is that I need to measure the resistance of the fan now. Is this correct? ---------------- Well, V=IR... and you have the needed current - 0.17A, as well as the Voltage - 24V So the resistance of the fan is R = V/I = 24/0.17 = 141ohms So I would say if you get 3 or 4 100ohm resistors (make sure they are rated 5-10W, not less) and wire them in series, you should be in business. Quote Link to comment Share on other sites More sharing options...
Marvel Posted July 3, 2005 Share Posted July 3, 2005 DrWho, I recently fixed one of those ART amps for a friend of mine. It was given to him by another acquaintance. All that was wrong with it was that the fuse holder solder connection was broken. Took all of ten minutes to fix. Those have a very small fan in the back of them, like a 25mm or something. Pretty clean amp, and the fan doesn't make much noise. Not a chip amp, but uses regular transistors. The dba rating is the noise the fan makes. db A weighting. The noise level comes from the fan blade shape and the speed of rotation, blah, blah... The grill on the fan can also be a cause for noise. You can take a 24volt fan and connect it to a 12volt supply and slow it down that way. But the 12volts make not give enough torque to have it start . Try this part number in a search at digikey: P9739-ND So... you are going to add resistors to slow down the fan. Then you can just use the fan to cool off the resistors. Quote Link to comment Share on other sites More sharing options...
tigerwoodKhorns Posted July 4, 2005 Author Share Posted July 4, 2005 Try this part number in a search at digikey: P9739-ND So... you are going to add resistors to slow down the fan. Then you can just use the fan to cool off the resistors. ---------------- Marvel, Thanks. I will order one fo those fans. I could not find it anywhere. Do I need to order a wire "pigtail" to go with it to hook it up? Thanks, Chris Quote Link to comment Share on other sites More sharing options...
tigerwoodKhorns Posted July 6, 2005 Author Share Posted July 6, 2005 Marvel, Ordered the low noise panaflo fan this morning. Less than $20 delivered. Thanks, I was really having a hard time finding one. My only complaint with the amp was teh fan noise (although it is only audible between tracks). Chris Quote Link to comment Share on other sites More sharing options...
DrWho Posted July 6, 2005 Share Posted July 6, 2005 ---------------- On 7/6/2005 12:40:22 AM tigerwoodKhorns wrote: Marvel, Ordered the low noise panaflo fan this morning. Less than $20 delivered. Thanks, I was really having a hard time finding one. My only complaint with the amp was teh fan noise (although it is only audible between tracks). Chris ---------------- You'll have to let us all know how the new fans work out...I am very interested in the mod as well, but just haven't gotten around to it yet. Quote Link to comment Share on other sites More sharing options...
tigerwoodKhorns Posted July 6, 2005 Author Share Posted July 6, 2005 ---------------- On 7/6/2005 3:12:36 AM DrWho wrote: ---------------- On 7/6/2005 12:40:22 AM tigerwoodKhorns wrote: Marvel, Ordered the low noise panaflo fan this morning. Less than $20 delivered. Thanks, I was really having a hard time finding one. My only complaint with the amp was teh fan noise (although it is only audible between tracks). Chris ---------------- You'll have to let us all know how the new fans work out...I am very interested in the mod as well, but just haven't gotten around to it yet. ---------------- The original amp is actually pretty quiet. My guess is that with the new fan (like 20 something db compared ot in the 50's - I think) will be virtually dead silent. The fan is in the back of the unit, which helps. Chris Quote Link to comment Share on other sites More sharing options...
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