Thermal Considerations, AC Power Considerations

shelf across the back of the rack, or angle brackets attached between the rear support rails and the rear rails of the rack. This is recommended for all components mounted in a rack that is going to be moved frequently (or thrown in the back of a pickup truck and transported down a bumpy gravel road to that outdoor festival!).

Thermal Considerations

The Juice ampliﬁers are fan-cooled with two separate fans. One fan brings cool air in from the back and the other fan blows the warm air out the front of the chassis. Make sure that cool air is available at the back of the ampliﬁer, and that there is room in the front for the warm air to exit from the ampliﬁer and dissipate. If rack-mounted, make sure the air being drawn from the rack is cool. Some rack- mounted equipment expel warm air into the rack.

When the ampliﬁer is ﬁrst turned on, the fans run at low speed. As the power output increases and the amp warms up, the fans gradually increase in speed to provide additional cooling.

AC Power Considerations

Be sure the ampliﬁer is plugged into an AC outlet that is able to supply the speciﬁed voltage. Be sure the AC outlet can supply enough current to allow full power operation of all the ampliﬁers plugged into it. The outlet should be a three-prong socket that matches the power cord.

WARNING: Bypassing the plug’s safety ground pin can be dangerous. Don’t do it!

The AC current demand of an ampliﬁer varies depending on several factors, including the load impedance, the crest factor, and the duty cycle of the program material. Under typical conditions reproducing rock music where musical peaks are just below clipping, the Juice ampliﬁers require the following average currents.

J•800 = 5 A

J•1400 = 7 A

J•2500 =10 A

It is recommended that a stiﬀ supply of AC power be used because the ampliﬁer places high current demands on the AC line. The more power that is available on the line, the louder the ampliﬁer will play and the more peak output power will be available for cleaner, punchier bass.

If you have more than one ampliﬁer sharing an AC outlet, you should avoid turning them all on at the same time. Rather, sequence them on, one at a time, to prevent popping the circuit breaker (due

10to in-rush current).

Input Wiring

Use a high-quality 3-conductor shielded cable to connect the signal between the signal source (mixing console, equalizer, etc.) and the balanced inputs to the ampliﬁer. If you are using unbalanced inputs, use a high-quality 2-conductor shielded cable. Your TAPCO Dealer can recommend a suitable cable for your application.

When connecting a balanced signal, the connectors are wired thusly, according to the AES (Audio Engineering Society) standards:

	XLR	TRS
Hot (+)	Pin 2	Tip
Cold (–)	Pin 3	Ring
Shield (Gnd)	Pin 1	Shield

SHIELD 2

HOT

COLD 3 1

1SHIELD

3COLD

2HOT

BalancedXLRConnector

RING SLEEVE

SLEEVE RING TIP

TIP

RING

TIP

SLEEVE

Balanced1/4" TRSPlug

Unbalanced TS (Tip-Sleeve) lines can be accommodated via the TRS jack. Make sure the cord terminates with a TS plug (like a guitar plug), or if it is a TRS plug (like a headphone plug), make sure the ring is tied to the shield, preferably at the source.

SLEEVE

TIP

SLEEVE

Unbalanced1/4" TSPlug

If you set the AMP MODE switch to MONO or BRIDGE, use the INPUT 1 input only.