• WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required as is 20 years of participation in forums (not all true). There are daily reviews of audio hardware and expert members to help answer your questions. Click here to have your audio equipment measured for free!

Distorsion vs Power graph explanation

Zamiel

New Member
Joined
Aug 18, 2022
Messages
3
Likes
2
hello, i have a question: i don't think i understand the graph that is shown in every headphone amp review.

look for instance at the review of the topping l30 ii

sinad at mid gain is 121db but the graph at 300 ohms shows 106db at low gain and 113db at high gain. at 32 ohms 106db and 112db respectively.

can you please explain to me the correct way to read that graph?
 

amirm

Founder/Admin
Staff Member
CFO (Chief Fun Officer)
Joined
Feb 13, 2016
Messages
39,501
Likes
180,021
Location
Seattle Area
There are some differences in the measurements. The dashboard runs with a load of 600 ohm which is not represented in the power curves. And due to historical reasons, the power curve doesn't use the high performance sine analyzer in audio precision. Both of these contribute to lowering the SINAD in the power graphs. I probably should fix these inconsistencies but then it breaks backward compatibility with current database of measurements.
 
Top Bottom