Graphic Curves - McIntosh MP1100 Owner's Manual

MP1100 Graphic Curves
Phonograph Record Playback Equalizer
In order to increase the music playback time and
reduce noise of a Record Disc, several different Equal-
izer Curves have been used over the last 100 years.
When a master disc is created, the volume level of the
low frequencies are reduced and the volume level of
the high frequences are increased.
During playback of the Record, the Amplifica-
tion Equalizer Process restores the correct Frequency
Response by increasing the volume level of the low
frequencies and reducing the volume level of the high
frequences.
Since 1956 the RIAA Equal-
izer Standard has been in use.
The "RIAA Phonograph Record
Frequency Response" curve to the
right is an example of the actual
sound on the record disc. During
playback, the RIAA Equalizer is
applied during the amplification
process restoring the sound qual-
ity to a flat Frequency Response.
Refer to "RIAA Equalizer Fre-
quency Response" curve to the
right side.
The MP1100 incorporates
additional Equalizer Frequency
Response Curves for Phonograph
Records that were made before
1956. Those Equalizer Curves
include LP, NAB, AES and 78 are
shown on this and the next page.
RIAA Phonograph Record Frequency Response
+25dB
+20dB
+15dB
+10dB
D
E
+5dB
C
I
+0dB
B
E
L
-5dB
-10dB
-15dB
-20dB
-25dB
20Hz 50Hz 100Hz 200Hz 500Hz
FREQUENCY
RIAA Equalizer Frequency Response
+25dB
+20dB
+15dB
+10dB
D
E
+5dB
C
I
+0dB
B
E
L
-5dB
-10dB
-15dB
-20dB
-25dB
20Hz 50Hz 100Hz 200Hz 500Hz
FREQUENCY
1kHz 2kHz 5kHz 10kHz 20kHz
1kHz 2kHz 5kHz 10kHz 20kHz
LP Equalizer Frequency Response
+25dB
+20dB
+15dB
+10dB
D
E
+5dB
C
I
+0dB
B
E
L
-5dB
-10dB
-15dB
-20dB
-25dB
20Hz 50Hz 100Hz 200Hz 500Hz
FREQUENCY
NAB Equalizer Frequency Response
+25dB
+20dB
+15dB
+10dB
D
E
+5dB
C
I
+0dB
B
E
L
-5dB
-10dB
-15dB
-20dB
-25dB
20Hz 50Hz 100Hz 200Hz 500Hz
FREQUENCY
AES Equalizer Frequency Response
+25dB
+20dB
+15dB
+10dB
D
E
+5dB
C
I
B +0dB
E
L
-5dB
-10dB
-15dB
-20dB
-25dB
20Hz 50Hz 100Hz 200Hz 500Hz
FREQUENCY
MP1100 Graphic Curves
1kHz 2kHz 5kHz 10kHz 20kHz
1kHz 2kHz 5kHz 10kHz 20kHz
1kHz 2kHz 5kHz 10kHz 20kHz
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