K2 Amplifier Heat
Posted 09 January 2006 - 12:53 AM
For what it is worth, the amp is in bridged mode, and the channel 1 gain is at 0 (full gain). It is being fed a summed bass signal from a dbx Drive Rack PA, which runs pretty darned hot itself. Lastly, the thermal overload lights on the front panel did not come on at any time during the 4 hours that the amp ran.
Any feedback on your experience with this amp would be appreciated.
Posted 09 January 2006 - 09:45 AM
Posted 09 January 2006 - 10:13 PM
I understand what you are saying about the case being the heat dissipation mechanism. However, it doesn't explain the excessive heat coming off of the thing driving a pair of home audio 8" midbass woofers. An Adcom 555 amplifier with 1/3 the power delivery potential of the Crown never even got warm under the same conditions. I should bring home a temperature gun from work and measure the surface temperature of the amp so that I have some real numbers to share with you. "Hot to the touch" is just too subjective. Are there any tests that I can run to determine if the amp is drawing excessive current? I can probably find an amp meter to measure idle current on the plug.
Posted 10 January 2006 - 08:43 AM
They K-series amps are a PWM switching output stage amplifier. The switching done in the amplifier for the reproduction of the signal is accruing all the time the amplifier is reproducing a signal and is not in sleep mode. In other words when its on its on. Thus it will be generating some heat even when it is only producing a low level signal. However, compared to a conventional linear output stage amplifier it produces about half the heat for the same output. You can’t get that type of power without some heat. Take a look at the BTU/Hr rating of the K-2 as compared to the MA-2402 (that has the same output power) and you will see that the K-2 is a lot more efficient. The MA-2402 is a linear amplifier design and if its fan was disabled the amp would shortly, even at idle, go into thermal protection.
Because of the efficiency of the K-2 amplifiers they do not require a fan for internal cooling and rely on their chassis and front panel for “Convection” cooling and the TLC circuit for protection. If the TLC/Thermal light comes on than the amplifier will start limiting its output until the thermal issue goes away in that channel or channels.
In the old days of DC300 amplifiers we used convection cooling. During those days I have seen DC300s (rated for only175w/8-ohms) so hot you could fry an egg on them and that was with a window box fan blowing on them. The K-2 is rated for 500 watts/8-ohms and yes it will get hot to the touch its Convection cooled.
If you desire to test the current draw of the amplifier the above mentioned sheets will give you an average of were you would be at for inputs of different Duty Cycles.
Posted 17 January 2006 - 11:55 AM
Based on this unscientific info, something sounds odd about your scenario, I wouldn't think they would be THAT hot. There also shouldn't be anything rattling around inside.
Hope that helps.
Posted 21 January 2006 - 10:21 AM
Posted 22 January 2006 - 05:43 PM
If you think it is ideed defective then you better just get a refund from the seller and let him handle UPS...UPS dont pay out if it was not packaged correctly...*beep* they dont pay out even if it was.