JOPLIN M
K
II
384
k
H
z
/32bit ANALOG-TO-DIGITAL CONVERTER
REVISION P
R
A – FEBRUARY 2015
Copyright © 2015, M2Tech Srl
57
M2Tech
www.m2tech.biz
To better understand the effect of using the wrong equalization curve to play a
record, Figure 24 shows the relative level versus frequency of the music when
playing a Decca FFRR record through a RIAA phono input of a modern amplifier.
Equalization of the signal of a Decca FFRR record being amplified by a RIAA phono
stage
-3
-2
-1
0
1
2
3
4
5
6
7
10
12
,5
16
20
25
31
,5
40
50
63
80 10
0
12
5
16
0
20
0
25
0
31
5
40
0
50
0
63
0
80
0
10
00
12
50
16
00
20
00
25
00
31
25
40
00
50
00
63
00
80
00
10
00
0
12
50
0
16
00
0
20
00
0
Hz
d
B
Figure 24
See how low frequencies are excessively exalted due to the different turnover
frequency (50Hz for RIAA, 100Hz for FFRR), while high frequencies are attenuated
more than required due to the different roll-off (13.7dB for RIAA, 10.5dB for FFRR).
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