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LaScala AL5 Noise


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5 minutes ago, babadono said:

@Kingdeezie did we ever get an answer..are you using the unbalanced or balanced inputs on the Pass?. The balanced inputs require a different type of "shorting plug".

Pass already told him the amp was operating normally and the noise floor was normal and audible with sensitive speakers.  Nothing to troubleshoot.  

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2 hours ago, Stephen Buck said:

The OP complained about noise floor not THD anyway.  Audible THD is around 5% for an average ear so all these decimal places are pretty much meaningless.  There are other qualities of amps that are more noticeable once THD is below audible levels.  
 

Here’s a simple discussion of car audio THD.
 

“When the harmonics reach 5%, they are clearly audible. If the tone was music, you would have trouble hearing 5% THD. The 1 % is only barely audible and it's mixed with a continuous, steady tone. With music, it would be inaudible.” https://www.bcae1.com/thd.htm#:~:text=When the harmonics reach 5%%2C they are clearly,steady tone. With music%2C it would be inaudible.

 

People hear noise floor long before they complain of THD.  People also complain of an amp not producing adequate high frequency at low volumes, and then lacking LF slam at higher volumes.  Then there’s the midrange mud.  But some artist sound benefits from lack of reproduction fidelity so there’s that too. 
 I’m always surprised with what people latch onto spec-wise instead of what they have learned to hear and expect out of old and new music. 

Most of the distortion analyzers give THD and THD+noise figures. I have found a noise figure 50db down from primary signal to be quite on my LaScala's and plenty good enough. Noise, hum mostly, not heard. 

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13 minutes ago, henry4841 said:

Most of the distortion analyzers give THD and THD+noise figures. I have found a noise figure 50db down from primary signal to be quite on my LaScala's and plenty good enough. Noise, hum mostly, not heard. 

Can your experience be translated into THD+N minimum specs for amp buyers to consider with Klipsch?  Yamaha indicates residual noise at 40 uVrms.  If an amp is audible at zero input there’s voltage that can be measured on speaker cables with meter.  Surely one could just measure that and know if it will be audible on klipsch.  Seems easy enough for a dealer to measure and communicate. 

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24 minutes ago, Stephen Buck said:

Can your experience be translated into THD+N minimum specs for amp buyers to consider with Klipsch?  Yamaha indicates residual noise at 40 uVrms.  If an amp is audible at zero input there’s voltage that can be measured on speaker cables with meter.  Surely one could just measure that and know if it will be audible on klipsch.  Seems easy enough for a dealer to measure and communicate. 

I do not feel it necessary being modest consumer amplifiers should be quite on our speakers. If you hear hum or noise chances are something is wrong with the device. I am not familiar with comparing uVrms with what I mentioned. I am sure there is info on the net that would do so for those interested. 

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4 hours ago, Stephen Buck said:

Can your experience be translated into THD+N minimum specs for amp buyers to consider with Klipsch?  Yamaha indicates residual noise at 40 uVrms.  

After some thought, the number of .040v's rms needs converting to the more common THD+N just as you said. Companies do this to confuse or for more talented electronic guys than myself. Just how do you get rms into the equation? Above my head. 

 

Best way to be sure is try and find a reviewer that has put that amp into a lab test to get the THD+N number.

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