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are using the EA490 as in an active subwoofer/satellite system (as e.g. de-
scribed under section 2.2) you should set the both frequency controls ("FREQ.
Hz") of "FRONT and "REAR" to center position (12 o'clock). Then the start
with the adjustment of the subwoofer"LEVEL", i.e. the "REAR" system. Turn the
sensitivity "LEVEL" on the "REAR" control section of the amplifier at 3/4 to full
(clockwise). Now you mix-in the mid-high frequencies of the 'satellites' using
the "LEVEL" control of the ''FRONT" section until you reach the best balanced
sound with the current cross-over frequency settings. The following section of
this manual (3.2) will describe the fine-tuning of the cross-over frequencies,
after which a final fine-tuning of the input sensitivity setting for the 'satellites'
("FRONT" section) has to be carried out again.
3.2 Cross-Over/Filtering Adjustments („FREQ. Hz“)
All EMPHASER amplifiers incorporate an electronic crossover, that is activa-
ted through the switches on the bottom panel of the amplifiers. The individu-
ally selectable filtering modes may either be used to drive a subwoofer (in
"LPF"/Low-Pass mode) or a 'satellite' type coaxial or component system (in
"HPF"/High-Pass mode). The 4-channel model EA490 even allows both am-
plification modes simultaneously.
The correct setting has to be determined by ear. The two most important fac-
tors for the individual adjustment will be the reproduction of the mid-bass fre-
quencies and the required power-handling of the satellites system. If the cross-
over frequency is set too low, the mid-bass reproduction will be increased,
but the power-handling of the 'satellites' will be decreased. If the cross-over
frequency is set too high, the mid-bass reproduction will become 'thin', whi-
le the power-handling of the 'satellites' will increase. Try to find a setting, that
will suit your personal listening preferences and the physical and electrical
capabilities of your equipment best.
If you are using your (2-channel) amplifier to drive a subwoofer, you should
ideally select your "LPF" cross-over frequency between 50 Hz and 90 Hz. Ad-
just the "FREQ. Hz" control in a way, that the bass reproduction is dry, yet still
offering a good and solid low end extension. Setting the cross-over fre-
quency too low, will result in a soft and uncontrolled bass response. Setting
the "FREQ. Hz" control too high, will result in a 'booming' and hard sound.
EA2190490 Manual neu 31.07.2000 19:02 Uhr Seite 13
