Manual JBL Project K2 S9900 (page 34 of 42) (English, All languages)

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I. Passive Connection Method

The passive method requires one ampliﬁer and one set of wires. Connections are

made to either the upper terminals or the lower terminals. Do not remove the

shorting straps.

II. Bi-Wire Connection Method

The bi-wire connection method requires one ampliﬁer and two sets of speaker

wires. By removing the shorting straps, connections may be made to the

individual network sections using four connectors, high-frequency wires to the

upper terminals and low-frequency wires to the lower terminals.

III. Active Bi-Wire Connection Method

This connection method uses two ampliﬁer channels and two sets of speaker

wires. Each ampliﬁer input is fed from the same preampliﬁer output. In this

case, the shorting straps must be removed and separate speaker cables are run

from each ampliﬁer channel, one to the high-frequency posts and the other to the

low-frequency posts.

IV. Bi-Amp Connection Method

The bi-amp connection method requires two ampliﬁers, one for the low-frequency

unit and one for the high-frequency unit, and an external electronic crossover

network. By removing the shorting straps, connections may be made in the

following way. Wires from the high-frequency ampliﬁer are connected to the

upper terminals, and wires from the low-frequency ampliﬁers are connected to

the lower terminals. The bi-amp switch must be set to the bi-amp position to

disable the internal crossover function. Internal level adjustment and high-

frequency equalization circuitry remain active.

The ampliﬁers are fed from the output of an electronic crossover unit (not

included). This crossover must be conﬁgured to produce the electrical drive

illustrated in Figure 8. These curves are very unusual and will be difﬁcult for a

commercially available crossover unit to properly emulate. It is for this reason

that bi-ampliﬁcation of the K2 S9900 is not recommended.

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JBL Project K2 S9900 Manual

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