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Re: Benefits of an amp?
Ya_basta #326057 10/19/10 06:57 PM
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Originally Posted By: wheelz999
I noticed an audible difference between my 3801/3808, and my Emotiva RPA-1 when running my Paradigm Monitor 9's or M80's. The RPA-1 just seems to bring the speakers to life; it's like a breath of fresh air as everything sounds cleaner at all levels.


Don't tell Pmbuko.

Re: Benefits of an amp?
CatBrat #326058 10/19/10 07:14 PM
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This would have been a good double blind test to do at the Axiom plant last month....an "off the shelf" 100 watt receiver vs an Uberexpensivestein Mach 2 amp running the same speakers.


Half of communication is listening. You can't listen with your mouth.
Re: Benefits of an amp?
Ya_basta #326064 10/19/10 07:36 PM
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+1 to what wheelz is saying.

When I had older Yamaha 5 chanell amp, adding an Emotiva UPA-2 amp made a startling difference with my then Energy Speakers.
Most multi channel amplifier measure WATT output power by the stereo.

Two Pioneer Elite AVR example specs.

VSX23THX
Front (stereo) 110 W + 110 W
Power output (1 kHz, 6 Ω, 0.05 %, 1 ch driven)
150 W per channel
Guaranteed speaker impedance 16 Ω to 8 Ω,
less than 8 Ω to 6 Ω (setting required)

SC-05
Multi channel simultaneous power output (1 kHz, 1 %, 8 Ω)
7ch total 700 W (SC-07)/630 W (SC-05)
Continuous Power Output (20 Hz to 20 kHz, 8 Ω, 0.09 %)
Front 140 W + 140 W
Center 140 W
Surround 140 W + 140 W
Surround back 140 W + 140 W
Continuous Power Output (1 kHz, 6 Ω, 1.0 %)
Front 180 W + 180 W
Center 180 W
Surround 180 W + 180 W
Surround back 180 W + 180 W
Total harmonic distortion 0.05 %
(20 Hz to 20 kHz, 130 W, 8 Ω)

SC-05 is continuous power. I love it, my M22, M2 and QS8 are unreal on the SC-05 (which I upgraded to from the VSX23THX).


SC-05, HLT6189, Oppo BDP-93, Blue Circle Audio FX2
Axiom M2v3's, QS8v3's
Re: Benefits of an amp?
CatBrat #326078 10/19/10 09:37 PM
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Originally Posted By: CatBrat
Originally Posted By: wheelz999
I noticed an audible difference between my 3801/3808, and my Emotiva RPA-1 when running my Paradigm Monitor 9's or M80's. The RPA-1 just seems to bring the speakers to life; it's like a breath of fresh air as everything sounds cleaner at all levels.


Don't tell Pmbuko.


Never heard of that guy grin .


The only reasonable argument for owning a gun is to protect yourself from the police.
Re: Benefits of an amp?
terzaghi #326085 10/19/10 10:44 PM
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Originally Posted By: terzaghi
Jason, would you say that you had to crank things above your loudness comfort zone (beyond the loudest you typically listen) to really notice the differences?
No, as I said at low volumes the bass was what I could easily notice, but at normal levels there is a difference, the bass as mentioned but the vocals and instruments seemed to have better seperation, more detail and at high volume levels the music is just crystal clear, no distortion until I went well beyond anything anyone would try to listen to. I think I had the SPL meter at 105-110db and still pretty clean sounding.

It still comes down to diminishing returns, is the ~$4000 of the A1400-8 or ~$2500 of the A1400-2 worth the costs for this better sound. For some it is for others not so much. I still don't own one, maybe someday.


Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70
Re: Benefits of an amp?
jakewash #326090 10/19/10 11:19 PM
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Thanks for the clarification. I read the subtle difference in bass at low volumes and the more dramatic difference at loud volumes but was curious about the "in between" or normal to moderately loud listening volumes. I definitely would like to own a separate amp someday but there are a lot of other things I need to put my money toward first.


-David
Re: Benefits of an amp?
jhunt17 #326094 10/20/10 12:30 AM
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Originally Posted By: jhunt17
I was wondering at what point would you audibly notice the benefit of an amp? I own an Onkyo 805 and don't listen all that loudly. Can't really unless the kid, or soon to be kids, are not here. Anyway, is there an audible difference at any spl level, at some level, or only at high volume levels? I have always wanted to know this. I run my onkyo in 7.1 with axiom Epic 60 500 system. I am finding that I am becoming quite the movie soundtrack listener, such as Braveheart, The Patriot, Conan the Barbarian, BSG syfy channel, and other movie scores. I never thought I would enjoy this. I was strictly just a movie person until I got my speakers. Now I love to just hear MUSIC! Strange how that has changed. Anyway, I digress. Thanks for the input. Good Night All!


External amplification can have benefits. It depends on a lot of factors the extent of its benefits, in some cases it could be none at all. Such factors as room size, listening distance, SPL levels, sensitivity, impedance curves most notably the dips all can play important roles if a more robust amplifier with more dynamic headroom is needed.

A great example of the need for external amplification is this thread right here.

http://www.axiomaudio.com/boards/ubbthreads.php?ubb=showflat&Number=326093&page=1


The OP noted "harshness" during loud/dynamic passages. In these instances those brief dynamic passages are creating audible distortion. In this case the receiver does not have enough headroom to reproduce those peaks without distortion. Moving up to a more robust external amp with more dynamic headroom and lower distortion will certainly have audible improvements in perceived sound quality.


I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne
Re: Benefits of an amp?
wbedford #326123 10/20/10 02:56 AM
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Bill, you've in part misinterpreted the Pioneer specs and amplifier power ratings in general. All amplifiers sold in the U.S.(and effectively, Canada as well)have to comply with FTC(Federal Trade Commission)regulations in issuing a power rating for the units. In relevant part, it's required that FTC ratings be at the full rated power for at least five continuous minutes. Both of the Pioneer units that you mention are in compliance. They meet exactly the same continuous power standard, with the VSX23 being rated at 110 watts per channel and the SC-05 140 watts per channel. The difference between 110 watts and 140 watts is 1dB of maximum output. For example, a brief split second peak in very dynamic material could be played at 105dB using 110 watts and 106dB using 140 watts. That's all.

It can also be pointed out that this isn't, as an earlier reply characterized it, merely an individual who "believes" in a "theory". It's a very basic point of audio amplifier technology that power delivered with flat frequency response and inaudibly low noise and distortion(typical of even modest units these days)results in transparent amplification without any added audible coloration to differentiate the units. Enthusiastic and sincere contrary reports are available in abundance, but the only reliable way to determine such matters is by a controlled double blind test. Such tests have failed to show the differences reported in open hearing. When the name plates and price tags disappeared, so did the differences which were previously reported.

Re: Benefits of an amp?
Ya_basta #326132 10/20/10 04:06 AM
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Originally Posted By: wheelz999
Originally Posted By: CatBrat
Don't tell Pmbuko.


Never heard of that guy grin .

Yeah. I don't capitalize my screen name.

Re: Benefits of an amp?
JohnK #326134 10/20/10 04:11 AM
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So in essence it basically like me trying to lift 200 pounds by myself, I may be able to do it, but not very well, I might jerk, slow down, or drop it, In other words causing distortion in the sound in the form of peaks or clipping. As opposed to 3 or 4 people picking up the same 200 pounds. It can be done simply, smoothly, and without much effort. Basically giving me clean, smooth distortionless sound. So I guess the question becomes at what weight limit can I easily handle without stress. How do you go about finding this limit? When does it become audible?


7.1 theater room
60 fronts vp180 center 4 qs8's ep500 sub

3.0 tv room
m3's vp150 center
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