Manual

RCA INPUT, BOTH LOW LEVEL AND HIGH LEVEL.

The ampliﬁer LEVEL control has sufﬁcient adjustment range for both low level and high level input into the RCA

jacks. A factory source radio that does not have RCA output, using the wires that are connected to the speakers, can be

directly connected to the RCA jacks when the ampliﬁer LEVEL control is adjusted to 8V.

SETTING LEVEL

• Set the amplifier LEVEL control to minimum before you turn on the amplifier for the first time.

• For lowest distortion and lowest noise the ampliﬁer LEVEL should be set at the lowest setting that yields

sufﬁcient loudness without distortion. For lowest noise your source radio volume control should be near

maximum that does not cause distortion.

• To ﬁnd the best ampliﬁer LEVEL setting:

With the ampliﬁer LEVEL at minimum, slowly increase the source radio volume to around 3/4 without distortion.

Then, slowly turn up the ampliﬁer LEVEL control to the maximum desired loudness. Listen very carefully and

turn down the ampliﬁer LEVEL control if you hear any distortion.

SETTING SUBWOOFER HIGH PASS SUBSONIC FILTER:

• A subwoofer should have a high pass filter often called a subsonic filter. The purpose of a subsonic filter is to

limit very low frequencies that your subwoofer can not play loud enough without damage. Removing subsonic

frequencies can allow your subwoofer to play louder.

• For a sealed box the high pass is typically set between 10 Hz and 30 Hz to increase power handling capacity.

• For a vented box the high pass ﬁlter must be set 5 Hz lower than the port tune frequency to prevent woofer

damage.