Hi guy. I have a RX-A3040 and currently running in 7.2.1 setup.
I'm want to add an external amp for my front to
- off load my front from the AVR
- experiment with bi-amping my front
- do a 7.4.1 setup
- second zone.
To do this I'll need at least a 4 channel amp. I'm considering the used market to keep the cost down.
My plan is to first run my front on the external amp. This will allow me to do 7.4.1 setup. I'll see if there is an overall improvement in system performance in 7.2.1 setup. After that I'll experiment with bi-amping. If there is improvement then I'll leave it at that and the second zone might be served by BT3 later or when the front amp/speakers is upgraded. I can also NOT do bi-amp and use the extra channel for second zone if the need arise.
To sum the possible layout:
- external bi-amp front
- 7.4.1 setup
- 2nd zone later (BT3 maybe or when upgrade front speaker/amp)
or
- external amp front
- 7.4.1 setup
- external amp second zone
Most amp out there (I know of and within reach) will only do 2 channel, while they do A+B most are not bi-amp but bi-wire. I say this because if using A only min. 4 ohm, but A+B is min. 8ohm. And all my speakers are 6 ohm.
After looking around I have 2 possible options:
A pair of Kenwood KM-X1000 listed at RM2500
or
ADCOM GFA-6000 + GTP-600 listed at RM1588
or
Emotiva BasX-A300 (but where's the fun in experimenting?)
My question is will these amps allow me to do the above?
Are they at least as powerful and as clean as my RX-A3040?
With the KM-X1000 I should have enough power. Being separate amps, I have better redundacy if one goes down.
With the GFA-6000 I'm thinking to drive my HF using the 2 rear 60w(8ohm)-100w(4ohm) channel and the LF using the 2x100w(8ohm)-150w(4ohm) front channels.
As a bonus I could even drive my center using the 3rd front channel.
The pre-amp will probably be useful when I setup second zone.
My speakers are as below:
Front Yamaha NS-F160, Nominal/Max 50W/300W, 30Hz-36kHZ (-10dB), 87dB/2.83V/1m
Center Yamaha NS-C160, Nominal/Max 30W/80W, 60Hz-38kHZ (-10dB), 86dB/2.83V/1m
Front Height Yamaha NS-B160, Nominal/Max 30W/80W, 60Hz-38kHZ (-10dB), 82dB/2.83V/1m
Surround Back, Yamaha NS-B330, Nominal/Max 40W/120W, 55Hz-45kHZ (-10dB), 87dB/2.83V/1m
Surround Side, ELAC Debut B6, Nominal/Max ?W/120W, 44Hz-20kHZ (?dB), 87dB/2.83V/1m
Why bi-amp? You don't even have an external crossover unit to make bi-amp a noticeable difference.
No comment on the Kenwood amp, but the Adcom GFA-6000 and Emotiva BasX A300 has a more capable amp section than the A3040. Both can handle 4ohm loads at high volumes with relative ease. I have an A500 which in comparison to my A3060, does handle transient loads more linearly and does sound cleaner overall.
The receiver will get pretty darn hot when running at near reference volumes, especially since I crossover at 60hz. Is there an objective "sound quality" difference though? No, lol. That said, my A500 is relegated to powering my height speakers only as my main LCRs are powered by a Parasound A51.
Honestly, if you are looking at entry-level external amps - you should just be getting them for the sole purpose of adding more speakers. The latter of which it seems like you are planning to do, so I guess that's a legitimate purchase.
On another note, is it possible for you to look at a second subwoofer option? Because that's the single most significant upgrade you can add to your system instead of all these external amp addition.