what to look for on amplifier spec ? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 4 Old 12-01-2018, 04:47 PM - Thread Starter
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what to look for on amplifier spec ?

Let's assume 100w/ch rms (0.1% THD 20hz-20KHZ) at 8 ohm is all I need for stereo.
- is there a difference in sound quality of class D amp vs class A/B (is it noticeable to average user: watching movies, listening to youtube songs, etc)
- ignoring build quality and aesthetics, why one amp (NAD?) rated at 50w/ch costs $800 and then you can find other (emotiva basx?) for $200
both of them has similar spec: 50w/ch rms (0.05% THD 20hz-20KHZ) at 8 ohm
So, what's missing in the spec ?
What about damping factor (not sure what it is), and SNR, cross talk: How much is sufficient , after which they don't really matter

I recently got , I have polk RTI-A7 in the living room (no acoustic treatment), I want to know if people done similar research and found the thing they need.
I'm considering,
- Emotiva A-300: $400 | 150w/ch stereo
- Emotiva XPA-2 Gen3: $1000 | 300w/ch stereo | SMPS power supply
- Monoprice monolith 2x200w: $1000 | 200w/ch | torroidal power supply
- Outlaw model 5000: $650 | 180w/ch stereo, 120w/ch 5-channel
- Denon AVRX3400h: $600 | 100w/ch, class D?

How should I feed to amplifier
- headphone out from TV to the amp
right now I'm doing that and connects to emotiva basx-a100
- use preamp:
outlaw model 975
marantz sr5012 ($450 for refurbished)
$30 generic DAC from amazon (I already have FIIO d3k)
integra DHC-40.2 ($350 refurbished)

this is so confusing. I want to spend the money upto a point where I can hear the difference ?
Other question: should I save the money on amp and instead spend on better quality tower speaker

OOPS ... too many question.
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post #2 of 4 Old 12-01-2018, 05:03 PM
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1 spec for amps many recommend is that the watts double going from 8ohm to 4 ohm. so if 100watt 8 ohm its 200watt at 4 ohm.

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post #3 of 4 Old 12-01-2018, 05:56 PM
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Also, when the specs get to your head buy the physically heavier avr; quality weighs more.

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post #4 of 4 Old 12-01-2018, 06:55 PM
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Quote:
Originally Posted by torii View Post
1 spec for amps many recommend is that the watts double going from 8ohm to 4 ohm. so if 100watt 8 ohm its 200watt at 4 ohm.
In a perfect world yes, the power should double going to 4 Ohms from 8 Ohms..
Unfortunately in consumer audio products, they start to go into protection as the current goes up when switching to 4 Ohms. Therefore in certain consumer products one typically may see an increase of 40-60% for power output into 4 Ohms, but also the THD goes up as well.. Many entry price point consumer products actually put out less power into 4 Ohms..


Just my $0.02...
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