Wavtech link300.4mini User manual

www.wavtech-usa.com
Owner’s Manual
300W RMS 4-Channel Amplifier
link300.4mini

1
• DO NOT DRIVE WHILE DISTRACTED. Any function that requires your prolonged attention should not be
performed while driving. Always stop the vehicle in a safe location before performing any such function. Failure
to do so may result in an accident.
• KEEP THE VOLUME AT MODERATE LEVELS WHILE DRIVING. Excess volume levels can obscure sounds such
as emergency vehicle sirens or road warning signals and may result in an accident. Continuous exposure to high
sound pressure levels may cause permanent hearing loss. Use common sense and practice safe sound.
• FOR USE WITH 12V NEGATIVE GROUND VEHICLE APPLICATIONS ONLY. Using this product other than in its
designed application may result in fire, injury or product damage.
•MAKE THE CORRECT WIRING CONNECTIONS AND USE PROPER FUSE PROTECTION. Failure to connect
wiring correctly with appropriate gauge and fuse protection may result in fire, injury or product damage . When
replacing fuse(s), never exceed the specified rating. Ensure proper protection of all system power wiring and
install an external fuse (not included) with specified rating for each amplifier connected with the +12V lead at
the battery terminal.
• DISCONNECT THE NEGATIVE BATTERY TERMINAL BEFORE INSTALLATION. Failure to do so may result in
fire, injury or damage to the unit.
• D O NOT ALLOW CABLES TO BECOME ENTANGLED IN SURROUNDING OBJECTS. Arrange wiring and cables
to prevent obstructions when driving. Cables or wiring that obstruct or hang up on places such as steering
wheel, brake pedals, etc. can be extremely hazardous.
• DO NOT DAMAGE VEHICLE SYSTEMS OR WIRING WHEN DRILLING HOLES. When drilling holes in the
chassis for installation, take precautions so as not to contact, puncture or obstruct brake lines, fuel lines, fuel
tanks, electrical wiring, etc. Failure to take such precautions may result in fire or an accident.
• DO NOT UTILIZE OR CONNECT TO ANY PART OF VEHICLE SAFETY SYSTEMS. Bolts, nuts or wires used in
the brake, airbag, steering or any other safety-related systems or fuel tanks should NEVER be used for
mounting, power or ground connections. Using such parts may disable control of the vehicle or result in fire.
WARNING This symbol means important instructions.
Failure to heed them can result in serious injury or death.
CAUTION
• STOP USE IMMEDIATELY IF A PROBLEM OCCURS. Failure to do so may result in personal injury or damage to
the product. Return it to your authorized Wāvtech dealer.
• HAVE AN EXPERT DO THE WIRING AND INSTALLATION. This unit requires special technical skill and
experience for wiring and installation. To insure safety and proper function, always contact the authorized
dealer where you purchased the product to have it done professionally.
• INSTALL THE UNIT SECURELY WITH SPECIFIED PARTS. Be sure to use only the included parts and specified
installation accessories (not included). Use of other than designated parts may damage this unit. Install the
unit securely so that it will not come loose during a collision or sudden jolt.
• ROUTE WIRING AWAY FROM SHARP EDGES AND MOVING PARTS. Arrange cables and wiring away from
sharp or pointed edges and avoid moving parts such as seat hinges or rails to prevent pinching or wear. Use
loom protection where appropriate and always use a grommet for any wiring routed through metal.
• NEVER RUN SYSTEM WIRING OUTSIDE OR UNDERNEATH THE VEHICLE. All wiring must be routed, secured
and protected inside the vehicle. Failure to do so may result in fire, injury or property damage.
• INSTALL THE UNIT IN A DRY AND VENTILATED LOCATION. Avoid mounting locations where the unit will
likely be exposed to high moisture or heat without adequate ventilation. Moisture penetration or heat buildup
may result in product failure. Always make sure the amplifier chassis temperature is safe before touching it.
• REDUCE GAIN AND SOURCE VOLUME TO MINIMUM LEVELS FOR INITIAL SYSTEM TUNING. Ensure
amplifier power is off before connecting signal cables and follow proper system gain setting procedures.
Failure to do so may result in damage to the amplifier and/or connected speakers.
Package Contents: Accessories Required for
Installation (not included):
ŸRCA Cables or Signal Wire
ŸPower Supply & Speaker Wire
ŸIn-line Fuse Holder w/40A Fuse
ŸBattery Ring Terminal
ŸChassis Ground Terminal
ŸWire Crimp Connectors
ŸGrommets & Loom
ŸMounting Screws
WARNING
CAUTION
This symbol means important instructions.
Failure to heed them can result in injury or property damages.
Mounting Tabs
(pre-attached)
Spk Level
Input Terminals
Main Unit
Hex Wrenches
1+3/ 2+4
CH1/2
INPUT
CH FILTER LEVEL
TRIMCLIP
INPUT
CH GAINCLIP
1/2 1+3/
2+4
1/23/4
5V/
20V
10V/
40V
OFF LP
HP (Hz)50 500 (dB)-6 +6
CH3/4
MIN MAX
FILTER LEVEL
TRIM
OFF LP
HP (Hz)50 500 (dB)-6 +6
GAIN
MIN MAX
5V/
20V
10V/
40V

2
Introduction
Welcome to Wāvtech, exceptional mobile audio products for audiophiles. Our products are
engineered from the ground up to provide a truly remarkable listening experience with superior
performance, sound quality and reliability. Built for the professional installer, our innovative
features enable maximum application coverage with ultimate system flexibility. Whether retaining
the factory receiver or utilizing an aftermarket source, our solutions are simply the best available
for unlimited sound system upgrades.
Features:
• 4/3/2-Channel Bridgeable
• Differential Balanced Inputs
• Dual Input Range with Ideal Gain Structure
• Variable Gain Adjustments with Clip LEDs
• Variable -12dB/oct. HP/LP Filters
• Independent Input Channel Select
• 2-way Summing with +/-6dB Level Trim
• Auto Turn-On via DC-Offset and Audio Detect
• Stop-Start Vehicle Compatible
• OEM Load Detect System Compatible
• Active Rollback Thermal Management
• Panel Mount RCA Inputs with Bal/Unbal Select
• Locking Detachable Spk Level Input Terminals
• 4AWG Insert Power/Ground Terminals
• 12AWG Insert Speaker Output Terminals
• Compact Chassis w/Detachable Mounting Tabs
Input Panel Connections & Settings
Auto Turn-On Detect Jumpers:
Œ
By default, the amplifier is set to
detect both DC-offset and audio
signals for turning itself on/off
automatically. These jumpers
allow either turn-on mode to be
defeated independently for cases
where only one turn-on mode is
preferred or to bypass both
modes when a switched +12V trigger
is available and connected to the remote turn-on (REM) terminal.
Load Jumpers: Each speaker level input channel has built-in loading to satisfy most OEM load

detect systems. These internal loading circuits can be bypassed (OFF) for channels where no
loading is required, such as when a speaker is still directly connected to the source.
Speaker Level Input Terminals: For up to four channels of speaker level input connections to
Ž
the source. When set to the 20V input range (default), audio signal from 1-20Vrms will produce
up to full power output from maximum to minimum gain. For factory amplifiers with more than
20Vrms output signal or if volume range is not sufficient with gains set at minimum, select the
40V input range, which will reduce the input sensitivity by half for signals up to 40Vrms.
RCA Input Bal/Unbal Jumpers: These jumpers select the RCA input configuration between

balanced (default) and unbalanced. Unbalanced connects the RCA shield to ground reference,
which may be useful in eliminating noise under certain source or system conditions. Both
jumpers (left/right) should be moved together if changed.
RCA Inputs: For up to four channels of RCA line level input connections to the source. When

set to the 5V input range, audio signal from 0.2-5Vrms will produce up to full power output
from maximum to minimum gain. For sources with more than 5Vrms output signal or if volume
range is not sufficient with gains at minimum, select the 10V input range, which will reduce the
input sensitivity by half for signals up to 10Vrms. Use quality interconnects to ensure stable
connection and minimize the possibility for induced noise.
Power/Protect Indicator: This LED will illuminate green when the amplifier is powered on and
‘
operating normally. If a shutdown occurs due to a detected fault, the LED will turn red. Once
the fault has been corrected or the condition has cleared, the amplifier will automatically
recover, indicated by the LED changing back to green.
Œ
Ž


‘

Top Panel Controls
Input Channel: These switches are for
Œ
selecting which input channels feed the
respective channel pair's pre-amp and
output stages. CH1/2 can be set to direct
(1/2) or sum (1+3/2+4), while CH3/4 can
be set to copy (1/2), direct (3/4) or sum
(1+3/2+4). For 2-channel sources, connect
the source to CH1/2's RCA or speaker
level inputs and set CH3/4's input select
to copy (1/2), or use y-adapters/jumper wires and set to direct (3/4) to allow CH3/4's gain to be
used separately. For 4-channel sources, set CH1/2 to direct (1/2) and CH3/4 to direct (3/4). For
summing factory 2-way signals, there are several options that will depend upon the connected
speaker configuration. Example: For a 3-channel system from a factory 2-way source, CH1/2
would be set to sum (1+3/2+4) for full-range output to the main speakers, while CH3/4 would
be set to direct (3/4) to pass only the factory woofer signal to drive the subwoofer:
Input Sensitivity Range: Two input sensitivity ranges are provided for each channel pair to

optimize source volume range while minimizing the gain required to achieve full power output
for best signal-to-noise. Choose the input range that will accommodate the source's maximum
output signal voltage without excessive clipping, 5V or 10V for low level (RCA) inputs, and 20V
or 40V for speaker level inputs.
Gain Adjustment with Clip LED: Each channel pair has a variable gain with corresponding
Ž
clipping indicator, where the clip LED will dimly illuminate just before the onset of clipping and
become fully bright when the amplifier has reached full power output at clipping. When
summing, these gain adjustments should be used for matching relative levels so that the
combined signals sum as close to flat as possible or to the desired frequency response. Note
that CH3/4's gain adjustment will be bypassed if its input select switch is set to copy (1/2).
Filter Mode: This switch selects the filter mode as either a high-pass (HP) or low-pass (LP)

crossover, and is bypassed when set to OFF (default). For smaller full-range or component
speakers, select HP mode to filter out lower frequencies below the chosen cut-off frequency.
For midbass speakers or subwoofers, use the low-pass (LP) setting to filter out unwanted
higher frequencies above the chosen cut-off frequency.
Filter Frequency: When either the HP or LP filter mode is activated, this variable adjustment

sets the filter's cut-off frequency ( ) from 50Hz to 500Hz with a slope of -12dB/oct. Use this F3
adjustment to optimize speaker or subwoofer frequency response to what they can effectively
reproduce while minimizing the chance of being over-driven at maximum volume.
Level Trim: When summing, and after setting gains and crossovers for appropriate frequency
‘
response, these adjustments allow the power output of CH1/2 and CH3/4 to be increased or
decreased independently by up to +/-6dB for final volume balance between them while
preserving the summing ratio established by the gains. See the 3-channel system summing
example in above, where CH1/2's level trim would usually be reduced to achieve desired bass
Œ
overlap from CH3/4 at full volume. Note that increasing level trim of channels already at
maximum power output will require re-adjusting gains lower to avoid clipping.
3
ŒŽ‘
Level
Freq
CH3/4
IN
Level
CH1/2
IN CH1+3/2+4 OUT
Direct
Sum
Freq
CH3/4
OUT
Factory 2-way
Input link300.4mini Output
1/2 1+3/
2+4
1/2 1+3/
2+4
CH1/2
INPUT CH
CH3/4
INPUT CH
Sum
Direct
1+3/ 2+4
CH1/2
INPUT
CH FILTER LEVEL
TRIM
CLIP
INPUT
CH GAINCLIP
1/2 1+3/
2+4
1/23/4
5V/
20V
10V/
40V
OFF LP
HP (Hz)50 500 (dB)-6 +6
CH3/4
MIN MAX
FILTER LEVEL
TRIM
OFF LP
HP (Hz)50 500 (dB)-6 +6
GAIN
MIN MAX
5V/
20V
10V/
40V

CH3(L) CH4(R)
BRIDGED
CH1(L) CH2(R)
GND REM +12V
4
Power Supply & Output Panel Connections
Power Supply Terminal:
Œ
Ground (GND): The ground
Ÿ
terminal must be connected to a
metal part of the vehicle with
ground plane back to the main
battery ground attachment point
(a.k.a. chassis ground). This wire
should be as short as possible,
but no longer than 2ft (60cm),
with minimum gauge of 8AWG.
The ground wire should be terminated with a ground specific or ring terminal and securely
bolted to the vehicle with star or lock washer and nut to prevent from coming loose. The
chassis ground connection point should be scuffed to the bare metal.
Remote Turn-on (REM): If the source unit has a remote output wire (+12V switched output),
Ÿ
connect it to the REM terminal. If a remote lead is unavailable, the amplifier will automatically
turn-on by detecting DC-offset or audio signal from the source. While auto turn-on works well
in most applications, there may be some cases were a +12V trigger is preferable or necessary.
Both detect functions are enabled by default, but can be individually defeated via the two
jumpers located on the input panel.
ŸPower (+12V): The constant +12V power connection must be made at the vehicle's main
battery, securely connected with a ring terminal and protected with an in-line fuse within 18in
(45cm) from the positive battery terminal. The link300.4mini requires a 40A external in-line
fuse (not included) and a minimum power wire gauge of 8AWG. Do not install the fuse until all
other system connections have been made.
Speaker Output Terminal: Each (+) and (-) terminal pair per channel is for connecting the

amplifier's output to speaker(s) or subwoofer(s). Make sure to observe correct polarity and
total impedance per channel. The minimum nominal impedance is 2Ω per channel, or 4Ω for
bridged connections.
Mounting Tabs: These mounting tabs are pre-attached and should be used to properly secure
Ž
the amplifier with appropriate screws (not included) during installation to a solid mounting
surface that is directly attached to the metal structure of the vehicle cabin. These tabs are
removable if the unit can be safely secured by another method.
System Wiring
It is important to read this manual thoroughly before starting your installation and always plan
accordingly. Before installing any Wāvtech product, disconnect the negative (ground) wire from
the vehicle’s battery to avoid damage to the vehicle or yourself. Following all guidelines will ensure
years of enjoyment with your Wāvtech amplifier.
Chassis
Ground
≤2ft
(45cm)
Remote
Turn-on
≤18in
(45cm)
12V
Power Supply Terminal Wiring:
8AWG
(min)
Œ
Ž

CH3(L) CH4(R)
BRIDGED
CH1(L) CH2(R)
GND REM +12V
CH3(L) CH4(R)
BRIDGED
CH1(L) CH2(R)
GND REM +12V
CH3(L) CH4(R)
BRIDGED
CH1(L) CH2(R)
GND REM +12V
5
4-Channels 3-Channels (Stereo + Bridged)
Speaker Output Terminal Wiring:
2Ω
(min) 2Ω (min)
2Ω
(min)
2Ω
(min)
2Ω
(min) 2Ω (min)
4Ω
(min)
2-Channels (Bridged)
4Ω
(min) 4Ω (min)
RCA Input Wiring: Speaker Level Input Wiring:
CH1
(L) CH2 (R) CH4 (R)
CH3
(L)
Note: For a 2-channel source, connect to CH1/2 inputs and select copy (1/2) with CH3/4's INPUT CH switch. If
separate gain control is desired for CH3/4, use RCA y-adapters or jumper wires to connect CH1/2 to CH3/4's
inputs externally and select direct (3/4) with CH3/4's INPUT CH switch.
Note: After checking all wiring and connections, make all initial settings and adjustments before turning on the
amplifier to avoid damaging the connected speakers. Gains should always start at minimum with the appropriate
input range selected for your aftermarket or OEM source's maximum output voltage. For smaller speakers,
always activate the HP filter and set the cut-off frequency to protect them from being over-driven.

6
Specifications
link300.4mini
4Ω 50W RMS x 4
2Ω 75W RMS x 4
4Ω BTL
1W, 1kHz, A-wtd -80dBA
Max Flat (+0/-1dB)
Extended (+0/-3dB)
RCA Input
Spk Level Input
CH1/2
CH3/4
Low Range
High Range
Low Range
High Range
Slope
Boost/Cut
Remote
2V
via RCA Input 10mV/50mV (1kHz/100Hz)
via Spk Input
50mV/200mV (1kHz/100Hz)
<2.5mA
<1A
Fuse Rating
40A
Operational Voltage
7V - 16.5V
Rollback / Auto-Recover
Auto-Recover
Auto-Recover
Auto-Recover
16AWG, Insert/Plug
4AWG, Insert
12AWG, Insert
42 x 115 x 163mm
1.65" x 4.53" x 6.42"
44 x 115 x 189mm
1.73" x 4.53" x 7.44"
External (not included)
Thermal
Over-Voltage
Under-Voltage
Short Circuit
Current Draw Sleep Current
Idle Current
Protection
Chassis Dimensions HxWxL
w/o terminals, tabs
incl. terminals, tabs
Battery / DC Power Supply
Crossover HPF / LPF
Level Trim
Turn-On Threshold
Audio Signal
Terminals Speaker Level Input
Power Supply
Speaker Output
Input Impedance
Input Channel Select
Input Sensitivity
RCA Input
Spk Level Input
Power Output 14.4V,
<1%THD+N
S/N Ratio
Frequency Response <10Hz to >30KHz
150W RMS x 2
<10Hz to >45KHz
20KΩ
20KΩ / 20Ω
CH1/2, CH1+3/2+4
CH1/2, CH3/4, CH1+3/2+4
200mV - 5V
400mV - 10V
1V - 20V
2V - 40V
-12dB/oct.
+/-6dB
2.6Vvia REM
DC-Offset via Spk Input
Note: All Specifications are subject to change without notice.
Panel Mount
RCA Input
Frequency (F3) 50Hz - 500Hz
Auto-Recover
Over-Current

®
Wāvtech
©Copyright 2023 Wāvtech, LLC. All Rights Reserved.
1350 W. Melody Ave.
Suite 101
Gilbert, AZ 85233
[phone]
v0123
Warranty & Service Care
Wāvtech warrants this product to be free from defects in material and workmanship for a period
of one (1) year when purchased from an authorized Wāvtech retailer within the United States. This
warranty will be extended to a period of two (2) years when the installation is performed by an
authorized Wāvtech retailer. A valid sales receipt is required to verify eligibility of purchase and
installation.
This warranty is valid only to the original purchaser and is not transferrable to subsequent parties.
This warranty is void if the product serial number has been altered or removed. Any applicable
implied warranties are limited in duration to a period of express warranty as provided herein
beginning with the date of the original purchase at retail, and no warranties, whether expressed or
implied, shall apply to this product thereafter. Some states do not allow limitations on implied
warranties, therefore these exclusions may not apply to you. This warranty gives you specific legal
rights. You may also have other rights which vary from state to state.
If your product needs service, you should contact Wāvtech Customer Service to receive a Return
Authorization (RA) Number. Any product received without an RA number will be returned to
sender. Once your product is received and inspected by customer service, Wāvtech at its sole
discretion, will repair or replace it with a new or remanufactured product at no charge. Damage
caused by the following is not covered under warranty: accident, abuse, failure to follow
instructions, misuse, modification, neglect, unauthorized repair or water damage. This warranty
does not cover incidental or consequential damages. This warranty does not cover the cost of
removing or reinstalling the product. Cosmetic damage and normal wear are not covered under
warranty.
For Service within the United States:
Wāvtech Customer Service: [phone]
Monday – Friday, 8:30am to 5:00pm MST
Important Notice for International Customers:
For products purchased outside the United States of America or its Territories, please contact your
local distributor concerning specific procedures for your country's warranty policy. International
purchases are not covered by Wāvtech, LLC.
Serial Number:
Installation Date:
Place of Purchase: