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7. ADJUSTMENT OF THE CONTROL FUNCTIONS
7.1 SELECTING THE OPERATION MODE FOR SATELLITE SPEAKERS
Before you power up your amplifier, you must select and set an appropriate operation mode first. The
OPERATION MODE is set, depending on the speaker system connected to the amplifier.
You must configure each stereo channel pair to work in either in fullrange, highpass, lowpass or band-
pass mode. Select the appropriate operation mode for each channel pair (for the EA4150, two ope-
ration modes must be set): For example select HIGHPASS, if the speaker system is a component-, coa-
xial- or triaxial- type, respectively LOWPASS / BANDPASS in case of a kickbass system, or a subwo-
ofer respectively. If you own a head-unit, that spots an integrated DSP controlled active crossover, it is
recommended to use the DSP based crossovers - in this case you need to set the operation mode slide
switch(es) to FULL(range)!
In all other cases, i.e. when your head-unit does NOT feature integrated DSP controlled active filters
or for some reasons you don't want to use them, you MUST set the OPERATION MODE of each chan-
nel pair to the corresponding HP,LP or BP setting, that matches with the function of the connected spe-
aker pair! Otherwise, your speaker system might be damaged!
Selecting the appropriate operating mode for each channel pair makes sure, that the speakers con-
nected to the amplifier outputs will only receive filtered signals, so the speakers will only have to work
in the frequency bands they can reproduce best.
7.2 SELECTING A CROSSOVER FREQUENCY POINT FOR SATELLITE
SPEAKERS
For satellite speakers, you must select the position "HP" on the OPERATION MODE switch. The "HP"
operation mode will take away unnecessary mechanical and electrical 'strain' from the connected coa-
xial or component speaker systems, as they cannot reproduce strong and low bass signals anyway.
Depending on the actual cone surface, voice-coil diameter and the rated power handling of the instal-
led 'satellite' speakers, it is recommended to set the high-pass cross-over frequency point between 50
and 150Hz, using the "HI PASS" frequency control.
Note, that the appropriate setting should always be determined by ear! The two most important fac-
tors for this individual adjustment will be the reproduction of the mid-bass frequencies and the requi-
red safe power-handling capacity (cone excursion!) of the satellites, so the highpass crossover fre-
quency point is always a compromise setting. The rear satellite speaker settings listed below (3/4-CH),
could for instance apply if you own the EA4150 amplifier.
Front Door Satellite Speaker System ("HP" enabled, 1/2-CH)
HP Cross-Over Frequency
13 cm 2-way Component System
80 - 110Hz
16 cm 2- or 3-way Component System
50 - 80Hz
Rear Satellite Speaker System ("HP" enabled, 3/4-CH)
HP Cross-Over Frequency
13 cm 2-way Coaxial or Component System
100 - 120Hz
16 cm 2-way Coaxial or Component System
100 - 120Hz
6x9" or 7x10" Triaxial Speaker System
100 - 120Hz
EA 2/4-CH Manual 12.03.2002 12:55 Uhr Seite 15
