1) Pass Labs XONO
2) Manley Steelhead
3) Bryston BP26
4) GSP Jazzclub
Monday, June 14, 2010
RIAA error MM
The graphs below depict the log-volt distance from an RIAA curve normalized to the output voltage of the MM output of the preamps under test at 1 kHz, provided a 1 mV input signal.
1) Pass Labs XONO
2) Manley Steelhead
3) Bryston BP26
4) GSP Jazzclub
1) Pass Labs XONO
2) Manley Steelhead
3) Bryston BP26
4) GSP Jazzclub
Tuesday, June 8, 2010
RIAA error
next up in the curves is RIAA error. Without much introduction here are the curves (explanation to follow)...
These curves explain the output of each preamplifier in comparison to a reference RIAA curve. The reference RIAA curve was created using an industry standard RIAA 45-point curve provided by Audio Precision. The RIAA curve is then made to reference the 1 kHz output voltage of the first device (Pass Labs XONO, in blue). The reference is then held constant against the other devices, to demonstrate the level output difference as well as the curve disparity.
Much of the steep increases in both the Manley Steelhead and GSP Jazz Club + Elevator can be seen as the result of settling noise from variability in the AP. While this method of RIAA error does not seem to be exactly the same as the one Mr. Atkinson uses in Stereophile, it seems to be a reasonable assessment of the distance from a standard RIAA curve. However, as the measure seems better taken from comparing the freq response to a curve which is normalized to the standard output for a given device under test, the next graphs for MM will be plotted individually. The graph in this post however serves to demonstrate not only the RIAA error, but also the level differences between devices.
These curves explain the output of each preamplifier in comparison to a reference RIAA curve. The reference RIAA curve was created using an industry standard RIAA 45-point curve provided by Audio Precision. The RIAA curve is then made to reference the 1 kHz output voltage of the first device (Pass Labs XONO, in blue). The reference is then held constant against the other devices, to demonstrate the level output difference as well as the curve disparity.
Much of the steep increases in both the Manley Steelhead and GSP Jazz Club + Elevator can be seen as the result of settling noise from variability in the AP. While this method of RIAA error does not seem to be exactly the same as the one Mr. Atkinson uses in Stereophile, it seems to be a reasonable assessment of the distance from a standard RIAA curve. However, as the measure seems better taken from comparing the freq response to a curve which is normalized to the standard output for a given device under test, the next graphs for MM will be plotted individually. The graph in this post however serves to demonstrate not only the RIAA error, but also the level differences between devices.
Thursday, June 3, 2010
delta functions!
Learned how do perform delta functions with the AP. The RIAA error curve can now be displayed with a single waveform showing a preamp's de-emphasis deviation from a standard RIAA curve!
Curves to come! :)
Curves to come! :)
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