Features
Connections
Features
Overview: The Wavtech Link500.4mini is a compact 4-channel amplifier designed for both aftermarket and factory systems. Featuring Wavtech's best-in-class LOC (Line Output Converter), the ability to handle up to 40V of high-level signal input, OEM load detection, and a flexible summing matrix, the Link500.4mini is an ideal choice for factory sound system integration.
Class-D Power: The Wavtech Link500.4mini is a Class-D amplifier that's stable down to 2-ohms in stereo and 4-ohms bridged. The amp's power ratings are taken at 14.4V with <1% THD.
- 75W RMS x 4 @ 4Ω
- 125W RMS x 4 @ 2Ω
- 250W RMS x 2 @ 4Ω (bridged)
Differential-Balanced Inputs: The Link500.4mini features a differential-balanced input architecture to effectively control noise and ensure compatibility with a wide variety of source units, including many OEM systems. Without resorting to line output converters, you can directly connect most OEM source units to the amplifier without creating any noise or compatibility issues. Unlike conventional single-ended inputs, the differential-balanced design does not connect one side of the audio signal to chassis ground. This eliminates any voltage sensitivity between one input terminal and ground and greatly reduces the incidence of alternator whine in a typical car audio installation.
Cooling System: The outer shell of the Link500.4mini amplifier is designed to remove heat from the amplifier circuitry. For optimum cooling performance, this outer shell should be exposed to as large a volume of air as possible. Enclosing the amplifier in a small, poorly ventilated chamber can lead to excessive heat build-up and degraded performance.
Protection Circuitry: The amplifier features protection circuitry for thermal overload, DC output, over/under voltage, and short circuits. The amp stops operating when it goes into protection mode, with the Power indicator changing from Green to Red.
Auto Turn-on: When the amplifier is connected using speaker level inputs, from a factory or aftermarket head unit, the amplifier's auto turn-on feature can detect both DC-offset and audio signals, powering on the amp on when a signal is detected on the input. This eliminates the need to connect a turn-on lead to the amp's Power Control wire. A DC Aud Detect jumper on the input side of the amp can be set to On or Off.
Load Jumpers: Each speaker-level input channel features built-in loading (resistance) to accommodate most OEM load-detect systems. Four Load jumpers (On/Off), one per channel, let you select which channels will have the loading circuit engaged.
Input Summing: The Link500.4mini provides flexible input summing for a variety of signal configurations. Inputs 1/2 and 3/4 each have an Input CH switch, that determines the signal routing, along with a Trim Level dial that lets you balance out summed signals. Each Trim Level has a range of -6dB to +6dB.
- Channels 1&2: A 2-way selector provides the following:
- 1/2: Signals fed into inputs 1&2 will go to output channels 1&2.
- 1+3/2+4: This selection sums both sets of inputs to channel 1&2 speaker outputs. This setting works well if combining separate high- and mid-frequency channels in a factory system to power two full-range speakers.
- Channels 3&4: A 3-way selector provides the following:
- 1/2: Signals fed into inputs 1&2 will go to output channels 3&4.
- 3/4: Allows an independent connection to inputs 3&4.
- 1+3/2+4: This selection sums both sets of inputs to channel 3&4 speaker outputs.
Gain Adjustment & Clip LED: Each pair of channels has a variable Gain dial with a corresponding Clip indicator. The Gain should be adjusted with the sound source at 3/4 volume, and turned up until the Clip indicator starts to light. If the Clip indicator is on solid, the Gain should be lowered below the clip point. When summing signals, the Gain adjustments should be used for matching relative levels.
Input Range: Two input sensitivity ranges are provided for each pair of channels to optimize the source volume range while minimizing the gain required to achieve full output power without clipping. The 5V/20V setting should be used if low-level (RCA) signals up to 5V are used, or speaker-level signals up to 20V. The 10V/40V setting should be selected if connecting low-level signals up to 10V, or speaker-level signals up to 40V.
LP/HP Filter: Each pair of input channels features a filter that can be set to High-Pass, Low-Pass, or Off. A corresponding dial lets you select the cut-off frequency between 50Hz and 500Hz. Both crossovers have a 12dB per octave slope.
Parametric EQ: A single-band parametric equalizer lets you select a Frequency from 30-80Hz, with 0 to +12dB of boost. A Width (Q) adjustment from 1.5-5 lets you narrow or widen the boost range.
Subsonic Filter: If Channels 3&4 are set to Low-Pass, a Subsonic Filter can be used to remove frequencies below the selected frequency on the Subsonic dial. The subsonic filter cutoff has a range of 10-50Hz and a slope that goes up to 24dB/octave (@ 15Hz).
Connections
Speaker-Level Inputs: The Link500.4mini features two removable set-screw terminal blocks for attaching speaker-level input signals. The terminals can accept wire up to 12-gauge and signal levels from 1V-40V, accommodating even the highest power factory systems. An Input Range switch is provided for each pair of channels, allowing a wide range of input signal levels: at the 20V setting, signals ranging from 1V to 20V can be used. At the 40V setting, signals ranging from 2V to 40V can be used.
RCA Inputs: Two pairs of RCA low-level input jacks are provided for connection to an aftermarket headunit. The Input Range switch can be used to determine the input level for these inputs as well: the 5V setting can accept signals ranging from 200mV to 5V. At the 10V setting, signals ranging from 400mV to 10V can be used. Bal/Unbal jumpers for each pair of inputs let you select Balanced or Unbalanced. Unbalanced connects the RCA shield to ground, which may help eliminate noise under certain conditions.
Speaker Outputs: Four pairs of set-screw terminals are provided for the speaker outputs, each accepting wire up to 12-gauge. Bridging terminals are clearly indicated on the output panel.
Power/Ground/Remote: Set-screw terminals are provided for the power, ground, and remote turn-on terminals with the power and ground accepting up to 4-gauge wire (8-gauge recommended), and the remote terminal accepting wire up to 12-gauge.
Note: The Link300.4mini amplifier does not include any fuses. A 60A fuse should be installed on the power wire no more than 18" from the positive battery terminal. If an amp wiring kit with a different size fuse is used, the fuse should be replaced with a 60A fuse.
