Features
Controls
Connections
Features
CEA-2006 Compliant: CEA-2006 is a new system of testing and
measurement methods for mobile audio amplifiers. This voluntary standard
advocates a uniform method for determining an amplifier's RMS power output and
signal-to-noise ratio. The criteria for measuring power uses a DC input voltage
of 14.4 volts and the RMS power output is measured into a 4-ohm load, with 1% or
less Total Harmonic Distortion (THD) plus noise, and at a frequency range of 20
Hz to 20,000 Hz when applicable. Signal-to-Noise ratio is measured in weighted
absolute decibels (dBA) at a reference of 1 watt into 4 ohms. CEA-2006 allows
consumers to compare car amplifiers and receivers on an equal basis. The MTX
Jack Hammer JH805 under CEA-2006 regulations is rated at 37.5 Watts RMS x 4
channels with a 75dBA signal to noise ratio + 250 Watts RMX x 1 channel with a
70dBA signal to noise ratio.
5-Channel Amplifier: The
MTX Jack Hammer JH805 is a 5-channel amplifier designed to power your front and
rear full-range speakers as well as your subwoofer(s). The JH805 can be
configured for 5-way or 3-way operation.
2-Ohm Stable: The MTX
5-channel amplifier is capable of handling
load impedances down to 2-ohms. The amplifier is rated at 75 Watts RMS x 4
channels + 500 Watts RMS x 1 channel in 2 ohms with 1% THD.
Bridgeable: The
MTX JH805's Front (1/2) and Rear channels (3/4) can be bridged down to two
channels to output 150 Watts x 2-channels at 4 ohm.
AB/Class D Amplifier Design:
The Jack Hammer JH805 features an AB class
amplifier for its front and rear channels and a Class D amplifier for it
subwoofer channel.
- Pure N-Channel Mosfet Class A/B Design: The Jack Hammer's front and rear channel amplifier
utilizes Pure N-Channel Mosfet technology for more linear speaker control,
enhanced signal-to-noise ratio and more power. This design lets the audio signal
travel through fewer parts making the output stage of the amplifier more
efficient and giving you more usable power from the amp.
- Class-D Design: The JH805's subwoofer channel is
powered by a Class D mono-block amplifier, which uses digital switching to
amplify audio signals. This design results in high efficiency and less heat.
Active Fan Cooling: Rather than weighing the amplifier down
with heavy aluminum heat sinks, the Jack Hammer amplifier is cooled using a
variable speed internal fan. The increasing output of the amplifier engages the
fan to automatically increase its speed allowing more cool air to enter the
amplifier. This keeps the amplifier performing at its peak level longer and
prevents the amplifier from going into thermal shutdown due to overheating. The
fan will automatically slow down when the amplifier's output is decreased.
Protection Circuits: The JH805 provides Thermal and Overload
protection with LED indicators.
Stackable: You can stack up to three Jack Hammer amplifier on top of
one another using the supplied "JackStands".
Controls
Crossovers: The Jack Hammer JH805 is equipped with various crossovers
for all 5-channels.
- Front Channel Crossovers: The Front channels (1/2) feature a
variable 12dB/octave high-pass crossover which can be set between 40 and
8,000Hz. This crossover can be turned off for full-range operation.
- Rear Channel Crossovers: The Rear channels (2/3) feature variable
12dB/octave high-pass and low-pass crossover settings. The high-pass
crossover can be set between 40Hz and 8kHz, while the low-pass crossover can
be set between 40Hz and 5kHz. There is also and Band-Pass setting for
midrange or midbass speakers. In addition the Rear channels can be run at
full-range.
- Subwoofer Channel Crossovers: The Subwoofer channel features a
variable 24dB/octave low-pass crossover which can be set between 40 and
200Hz.
Bass Boost: The bass boost is adjustable from 0-12dB at 40Hz.
Sub-Sonic Filter: This amp features an adjustable 20 to 50Hz,
12dB/octave Sub-Sonic Filter. Ultra-low frequencies that cannot be reproduced by
a subwoofer do not become sound but become unnecessary oscillations, which
affect sound by causing distortion. These frequencies also waste amplifier power
and can cause damage to speakers. Setting the Sub-Sonic Filter between 20Hz to
50Hz cuts the frequencies below the respective frequency to improve the
reproduction performance of the speakers by eliminating harmful distortion.
Remote Bass Knob: The MTX JH805 comes supplied with a wired remote
bass knob which allows you to adjust the bass output of the amplifier's
subwoofer channel. The bass knob is designed to be mounted underneath your
vehicle's dash within arm's length so its easily accessible to the driver. The
bass knob connects to the amplifier using the supplied 16.5' RJ-11 cord. The
wired remote bass knob measures 2.655" wide x 0.755" tall x 1.955" deep.
Connections
Power/Ground/Turn-On Connections: The JH805 features set-screw terminals for the Power, Ground and Remote turn-on
lead. The Power and Ground terminals will accommodate up to an 4 AWG wire, while
the Remote turn-on lead will accept up to a 16 AWG wire.
RCA Inputs: The
three pair of RCA type line-level inputs have
gain (Input
Sensitivity) control. The Input Sensitivity control will accept an input signal
of 250mV to 5.0 Volts.
Smart-Engage Speaker Level Input: The Jack Hammer JH805
comes with a set of speaker level input harnesses. This feature makes it easier
to add an amplifier to a factory radio or to a receiver with no preamp outputs.
When using the speaker-level inputs, the amp automatically turns on when it
senses signal from the head unit, eliminating the need for a remote turn-on
connection. In many cases, this feature will allow you to install the amplifier
without removing your radio.
Speaker Connections:
The amplifier is equipped with six pairs of speaker terminals for connection of
4 pairs of speakers and a subwoofer(s). The
amplifier uses set-screw speaker terminals which will accommodate 12 to 8 AWG
speaker wire.
EBC: RJ-11 connection for connecting the supplied wire remote bass
knob.
Fuse: The
amplifier is equipped with three 30-AMP fuses.
