**********
Quote:Originally Posted by
kdnorberg
Sounds like I have a couple of good options to try. Definitely want to try the arx's and ascends.
I was planning on going with a stereo amp because my demon avr died and my tv room does not lend itself well to surround sound anyway. There is nowhere to put surround speakers other than the ceiling. So, I think I'm best set with a stereo amp.
The question of amplification leads to a point about the Ascends. Something you should weigh up is the comparative sensitivities of the speakers. The Ascend 340 SE's and say the ARX A1b and EMPTek E5Bi (to pick two others) have published sensitivities (anechoic) of 90dB/1W/1m, 86dB/1W/1m and 85dB/1W/1m respectively. The 4dB and 5dB deltas to the Ascends are not trivial. A 4dB gain requires 2.5x power and 5dB gain requires 3.2x power. In other words, to play at any given volume, the ARX's will require 2.5x the power and the EMPTeks will require 3.2x the power that the Ascends do to play at that level.
What does this mean in the real world? Say you wanted to play content quite loud with around 100dBSPL peaks from each speaker at say a 10ft listening position. With an average SPL loss of 3 to 4dB in the average residential room for each doubling of distance, or say 5dBSPL drawdown at 10ft, this would require the speaker to hit 105dBSPL peaks at 1m distance. In theory then, for the Ascends, this calls for 15dB (105 less 90) of gain from the amp or about
32W [dB = 10 * Log (Pout / Pin)]. The ARX's on the other hand would require 19dB gain or about
79W from the amp and the EMPTeks would require 20dB gain or
100W from the amp. Want to turn it up 5dB to "reference", or theoretical 105dB peaks at the listening position? In theory, the Ascends will need
100W, the ARX's
251W and the EMPTeks will need
316W for the peaks.
When you consider those numbers, the Ascend 340 SE's come into their own. For what is considered by many to be very loud levels, amplification required for the Ascends is well within the range of a mid-teir AVR or stereo amp and well within the power handling capabilities of the speaker (25%). Conversely, the ARX and EMPTek theoretically require very powerful amps to reach the same levels. The problem is though, these power levels are well beyond the claimed power handling capabilities of both these speakers. The ARX would likely be screaming for mercy (power compression; runaway heavy distortion) and the EMPTek would probably be mortally wounded by this point.
Quote:Originally Posted by
kdnorberg
3.1 is always a possibility. I was thinking that may be future upgrade.
Yes, save it for a future upgrade. In the long run you'll end up with a superior system if you can allocate your current budget to a pair of speakers rather than try to stretch it over 3, 5 or 7 from day one.