Hi Mike -
How hot your DNA-225 gets will depend on several factors, but I suspect that yours is behaving normally. The 225 runs on the warm side normally, assuming it is out in the open. Cabinets will restrict air flow more than you might think, and I feel that this is responsible for yours getting rather warm at idle - but this is not a problem. On the other hand, your Infinity Kappa speakers are known to be a difficult load, and may drop to below 2 Ohms at some point. This is undoubtedly why your amp becomes very hot with use. Under the circumstances, this is still normal behavior, but you might want to think about adding a small, quiet fan to circulate air in your cabinet. You may be surprised at how much cooler the amp will run if you push air into or out of the cabinet. Finally, the DNA-225 does not have a "soft" turn-on circuit, so its current demand at the instant you flip the power switch is quite high. Again, this is usually no problem - but if the circuit branch the amp is on is already loaded-down a bit (with lights or other appliances) or if the circuit breaker is "weak," or if there is a problem with the wiring, this may be enough to trip the breaker. The DNA-225 will not trip the circuit breaker on a normal 15A service, so if the breaker does trip, it may indicate a problem of some kind on that circuit branch.
Best regards,
Steve McCormack
www.SMcAudio.com
How hot your DNA-225 gets will depend on several factors, but I suspect that yours is behaving normally. The 225 runs on the warm side normally, assuming it is out in the open. Cabinets will restrict air flow more than you might think, and I feel that this is responsible for yours getting rather warm at idle - but this is not a problem. On the other hand, your Infinity Kappa speakers are known to be a difficult load, and may drop to below 2 Ohms at some point. This is undoubtedly why your amp becomes very hot with use. Under the circumstances, this is still normal behavior, but you might want to think about adding a small, quiet fan to circulate air in your cabinet. You may be surprised at how much cooler the amp will run if you push air into or out of the cabinet. Finally, the DNA-225 does not have a "soft" turn-on circuit, so its current demand at the instant you flip the power switch is quite high. Again, this is usually no problem - but if the circuit branch the amp is on is already loaded-down a bit (with lights or other appliances) or if the circuit breaker is "weak," or if there is a problem with the wiring, this may be enough to trip the breaker. The DNA-225 will not trip the circuit breaker on a normal 15A service, so if the breaker does trip, it may indicate a problem of some kind on that circuit branch.
Best regards,
Steve McCormack
www.SMcAudio.com