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post #81 of 250 Old 03-17-15, 04:27 PM
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Re: Home Theater Shack 2015 High-End Amplifier Evaluation Event Reporting and Discussion Thread

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I am glad you love the movie soundtrack, so do I. But in this case I am not speaking to the "low" in the sound but the impact supplied by the main speakers. This is where the impact of the tank shelling comes from and it will draw an awful lot of power to take command of the woofers and force them to do the right thing. I am sure the guts of a power supple would be severely taxed in these scenes.
This will also put on display many of the short comings of some amps in that they may not have power reserves to keep up.
Agreed... lots of midrange in that movie when the tanks fire off. I played the movie for a friend at -5db and he said the movie was perfect and wouldnt' want louder. SPL meter peaks were hitting around 101-102db but most of the movie bounced around the 85-95db range. I never noticed any strain.

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post #82 of 250 Old 03-17-15, 04:34 PM
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Re: Home Theater Shack 2015 High-End Amplifier Evaluation Event Reporting and Discussion Thread

Most excellent. I have not heard your speakers but I am sure they can do some harm to your body.

Good Listening

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post #83 of 250 Old 03-17-15, 04:36 PM
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Re: Home Theater Shack 2015 High-End Amplifier Evaluation Event Reporting and Discussion Thread

I think another thing that this session proves is that you do need more than just 30 - 50 watts of power to drive good speakers at comfortable listening levels. This also means that many low end receivers that drop to below 50watts per channel under load would fail at giving good levels of undistorted sound.

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post #84 of 250 Old 03-17-15, 04:39 PM
 
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Re: Home Theater Shack 2015 High-End Amplifier Evaluation Event Reporting and Discussion Thread

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I think another thing that this session proves is that you do need more than just 30 - 50 watts of power to drive good speakers at comfortable listening levels. This also means that many low end receivers that drop to below 50watts per channel under load would fail at giving good levels of undistorted sound.
It depends on the speaker efficiency, and how loud you want it.

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post #85 of 250 Old 03-17-15, 05:53 PM
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I'm not sure, but I think 80% is considered significant in a subjective endeavor. I'll dig around for more info when I return home. Agreed that repeatability would make the data more robust.

If we had more amps, it would likely have dinged my score down considerably. Less amps, I might have scored 100%.

Remembering X was easy for me until the end. The next test will build on this one and I'm confident the group will have better data. I do hope I can attend, this was a blast and I liked working with such an intelligent bunch.
The percent correct can only be said to be statistically significant when the acceptable level of error is decided and the number of trials is considered. 80% on 28 trials is very different from 80% on 7 trials.




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post #86 of 250 Old 03-17-15, 06:14 PM
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Re: Home Theater Shack 2015 High-End Amplifier Evaluation Event Reporting and Discussion Thread

Unless power ouput is measured it is only speculation on the actual values.
Lots of numbers can be bantered about, but unless you measure it you don't know what it is.
When the SPL is really high it is possible the speakers are the cause of the distortion as well as its possible the amp is the cause of the distortion.
Subwoofers go a long way towards amplifier relief.
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post #87 of 250 Old 03-17-15, 07:58 PM Thread Starter
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Re: Home Theater Shack 2015 High-End Amplifier Evaluation Event Reporting and Discussion Thread

Oh, and Sonnie and I spent some quality time Monday fine tuning the two channel soundstage with his MartinlLogan ESLs. Cannot believe I forgot to snap any pics of that. I will have him take a couple.

The results were pretty fine. Even got the density that gives super depth acuity. Thick as pudding.

He is a brave soul. A couple of times I admitted that a piece of the process might seem a little outlandish, and he always responded "as long as it sounde good." he seemed pleased with the final sound.

Part of what prompted this exercise was a wandering acoustic guitar on a Nickel Creek track We turned to placement of absorptive panels to control reflections, then to manipulating where the reflections fell, then on to other fine points. A report will follow.
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post #88 of 250 Old 03-17-15, 08:08 PM
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Re: Home Theater Shack 2015 High-End Amplifier Evaluation Event Reporting and Discussion Thread

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Oh, and Sonnie and I spent some quality time Monday fine tuning the two channel soundstage with his MartinlLogan ESLs. Cannot believe I forgot to snap any pics of that. I will have him take a couple.

The results were pretty fine. Even got the density that gives super depth acuity. Thick as pudding.

He is a brave soul. A couple of times I admitted that a piece of the process might seem a little outlandish, and he always responded "as long as it sounde good." he seemed pleased with the final sound.

Part of what prompted this exercise was a wandering acoustic guitar on a Nickel Creek track We turned to placement of absorptive panels to control reflections, then to manipulating where the reflections fell, then on to other fine points. A report will follow.
Very much looking forward to this...pics would be awesome.
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post #89 of 250 Old 03-18-15, 07:35 AM
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Re: Home Theater Shack 2015 High-End Amplifier Evaluation Event Reporting and Discussion Thread

Scatter shooting...
For me one of the unexpected outcomes of this endeavor even before the "official" report is posted is the apparent sudden about face in opinion by some members on the premise that amplifiers sound so different from each other that they can be easily identified.
This type of testing has been done many times, one well known test had $10,000 on the line for anyone that "passed" .... The $10k stayed in the challenger's pocket...... Probably a good thing for the promoter that tesseract was not around when that challenge was going on.....
I wonder if this about face on the amplifiers will hold once the detailed report is posted or will there be a sudden retrenching with countless objections and justifications of how the test was wrong.
Another belief to ponder is in regards to magic power cords or specially designed speaker wires and interconnects.
If amplifiers are so similar they cannot be distinguished from one another, how can a wire change the sound enough to be distinguishable from any other wire?
Just pondering the mysteries of the universe this morning.
Enjoy your coffee.
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post #90 of 250 Old 03-18-15, 07:37 AM
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Re: Home Theater Shack 2015 High-End Amplifier Evaluation Event Reporting and Discussion Thread

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chashint wrote: View Post
Scatter shooting...
For me one of the unexpected outcomes of this endeavor even before the "official" report is posted is the apparent sudden about face in opinion by some members on the premise that amplifiers sound so different from each other that they can be easily identified.
This type of testing has been done many times, one well known test had $10,000 on the line for anyone that "passed" .... The $10k stayed in the challenger's pocket...... Probably a good thing for the promoter that tesseract was not around when that challenge was going on.....
I wonder if this about face on the amplifiers will hold once the detailed report is posted or will there be a sudden retrenching with countless objections and justifications of how the test was wrong.
Another belief to ponder is in regards to magic power cords or specially designed speaker wires and interconnects.
If amplifiers are so similar they cannot be distinguished from one another, how can a wire change the sound enough to be distinguishable from any other wire?
Just pondering the mysteries of the universe this morning.
Enjoy your coffee.
I read that article too. I heard it was still out there as an option. Tesseract should look into the details

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