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POWER AMPLIFIER OWNER'S MANUAL
1. RCA Input Jacks – RCA type input jacks for use with source units that have RCA or Line Level Outputs.
Input Panel Layout
A source unit with a minimum output level of 200mV is required for proper operation. However, this input will
accept levels up to 8Vrms.
2. Thunder EQ – This equalization circuit is used to enhance the low frequency response of the vehi-
cle's interior. With up to 12dB of boost and centered at 40Hz, the Bass Boost can be adjusted to meet your
own personal taste.
3. Speaker Level Inputs – This input will allow the Thunder251D and 311D to operate from source units
with speaker-level outputs. Output speaker leads from the source unit should be tied directly to the wire har-
ness provided with the amplifier.
Wire harness color codes:
Grey / Black = Source units right negative (-)
White / Black = Source units left negative (-)
Solid Grey = Source units right positive (+)
Solid White = Source units left positive (+)
4. RCA Output Jacks – These RCA outputs allow for a signal to be sent to other amplifiers in a daisy-chain
configuration. The RCA outputs on all Thunder series amplifiers will send a full-range signal to additional ampli-
fiers.
5. Gain Controls – These controls are used to match the input sensitivity of the amplifier to the particular
source unit that you are using. The controls are factory set to 1Vrms.
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