ETI Sound Systems, INC US-3000 - Manual (Page 10)

THE BEAUTY OF POWER
B-52 US Series Professional Power Amplifiers - Instruction Manual
US SERIES AMPLIFIERS
1. FAN(S)
Cooling fans with variable speed controls. Air enters
the amplifier through vents located on the front alu-
minium panel. Do not block the front vents or the fans
on the rear panel of the amplifier.
2. INPUT CONNeCTORS
Connect the input source to these electronically bal-
anced Combo connectors using either XLR or 1/4”
TRS plugs. The 1/4” TRS and XLR plug are config-
ured: Pin 2 (Tip) - hot, Pin 3 (Ring) - cold, and Pin 1
(Sleeve) – shield/ground. We recommend using bal-
anced three-conductor cables. A stereo signal should
be connected to both the Channel 1 and Channel 2
input jacks for 2-channel (stereo) operation.
NOTe: Unbalanced two-conductor 1/4” plugs
can also be inserted into these input Combo
connectors. But using unbalanced connectors
may increase noise and hum. See more
information about balanced and unbalanced
connections in the CONNECTIONS section later
in this manual.
NOTe: For BRIDGED MONO or PARALLEL
MONO use the Channel 1 input jack only.
3. lINk CONNeCTORS
These XLR jacks are used to send a signal to a seper-
ate amplifier (chaining). The LINK XLR jacks are con-
nected in parallel to the input Combo jacks.
4. hPF (hIgh PASS FIlTeR) SWITCh
Use these slide switches to activate the built-in High
Pass filters. The HPF rolls off signals below 50Hz. This
improves the bass performance of most full range
speakers by reducing uncontrolled and excessive
speaker cone motion. Engaging the HPF switch when
using full range speakers makes more power avail-
able to the speaker’s rated frequency range, leading
to higher SPLs.
REAR PANEL CONTROLS
1
2 2 3 3
4 4 5 5
6
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