I'm thinking about replacing my KX650.4 with a SYN4 to power a pair of NVS Addictions. I know the SYN4 will draw less power from my batteries than the KX650.4, but do you guys think that I will notice any difference in sound?

i have two (2) syn fours running four (4) pro 80's. i am not an engineer and i had a pro install the system for me using really heavy wire all the way from the alternator and back and i can tell you that the amps never hardly even get warm. not hot, but warm. and i push them pretty hard. i believe they are supposed to be really efficient (whatever that means).

Nick, <BR> <BR>Just by the specs, with another 150 watts total (a 23 percent increase) you will pick up another 1 dB or so, or in other terms, another click or so on your volume control. <BR> <BR>A more significant upgrade will be seen in the SYN4's improved efficiency. At equal power levels you'll have longer playtime at rest. And, when you drive your system hard, the boat's voltage is going to drop resulting in lower amplifier power. But a more efficient amplifier will draw less current which translates to a more sustained voltage supply, thus the more efficient amplifier produces more power. Plus, a more efficient amplifier is kinder to your charging system. These are benefits that are difficult to convey with specs alone. <BR> <BR>The WetSounds SYN4 uses a Class AB output stage which is recognized for really good sound quality. What distinguishes this amplifier from other good Class ABs is the Class H power supply that is either very generous or very stingy depending on the instantaneous demands of the audio signal. This requires some pretty sophisticated and speedy microprocessing to govern the power supply that tracks and mirrors the audio signal. A pulse width modulated power supply is not generally the main source of an amplifier's inefficiency but the Class H power supply also significantly impacts the efficiency of the Class AB output section. The SYN 4 converts less power to heat (less waste). As a result a higher ratio of the power it draws is delivered to the speakers. <BR> <BR>I would encourage everyone to place greater emphasis on more efficiency in every aspect of their audio system, especially in a boat. <BR> <BR>David <BR>Earmark Marine

what amp would you run 2 pro80s on?

^^^ Wet Sounds Syn2.

^^^ I concur.

Thanks for the insight guys. I am aware of the improved efficiency and less strain on the battery system that the SYN4 will provide. I guess I was just wondering if there will be a noticeable difference in sound.

Yeah it will be able to play louder. <BR> <BR>"Just by the specs, with another 150 watts total (a 23 percent increase) you will pick up another 1 dB or so, or in other terms, another click or so on your volume control."

What about the Cadence TXA-3004 bridged?

I think that Cadence amp is a monster size-wise. I'm looking for something more compact, efficient, but still with solid power.