14
Jumper Settings In Detail
BLUE: Gain Adjustment:
There are three different levels of gain available.
Low Gain: Jumper on JP3; JP4 open
High Gain: Jumper on JP4; JP3 open
Very High Gain: Jumper on JP3 + JP4
GREEN: RIAA‐Equalisation with Neumann‐Option:
The RIAA equalisation corrects a corresponding mirrored pre‐equalisation present on every record. The classical RIAA has
an endless filtering on the top frequency range, which would imply that the record was pre‐equalised with an endless gain
during the LP production process ‐ apperantly this is impossible. When cutting a record the top frequency gain of course
has a limit and the Neumann company defined the quasi standard for this ultrasonic limit. A Phono MCCI's default setting
with Neumann time constant delivers a decent but clearly audible advantage of reproduction quality on the top end of the
frequency range, due to better phase response and a slight correction on the frequency response. In any case this
equalisation matches better to the original pre‐equalisation than the classical RIAA. Beside the top end of the frequency
range the equalisation is identical to the RIAA. Optionally Phono MCCI can be set to traditional RIAA equalisation, which in
fact causes a soft roll‐off of the top end frequencies.
RIAA with Neumann‐Option: Jumper on JP9 + JP10; JP11 + JP12 open
RIAA without Neumann‐Option: Jumper on JP11 + JP12; JP9 + JP10 open
ORANGE: Subsonic‐Filter:
Due to the cartridge‐tonearm resonance in some cases a substancial resonance peak in the infrasonic frequency range may
degrade the sound quality and in worst case cause damages to the spekers or amplifiers. The performance depends on a
good match of cartridge and tonearm as well as proper arm damping. A linear low frequency response close to DC is not
possible for phono reproduction and a flat low‐end response requires careful setup of the cartridge, the tonearm and the
turntable.
In case of such troubles it is recommended to activate Phono MCCI's subsonic filter. It is a rather soft type as strong
frequency peaks should be corrected by an improved setup.
Linear (no Subsonic): Jumper on JP1 + JP2
Subsonic: JP1 + JP2 open
RED: Low End Corrections:
The opposite of the above also happens sometimes: A too early low‐end‐frequency roll off and in consequence a lack of
sonic substance. For this purpose Phono MCCI offers different settings:
Linear: JP5 + JP6 open (JP7 + JP8: don't care)
Bass boost: Jumper on JP5 + JP6 + JP7 + JP8
Bass boost and „warmer“ sound: Jumper on JP5 + JP6; JP7 + JP8 open
Note: Combining a bass boost with subsonic may make sense in some cases. This way the sonic
substance could be increased while adding speaker protection.
