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JL AUDIO 300/4 SLASH SERIES 4 Channel Amplifier NEW 04
Last Price: GBP279.00
Ending Date and Time (GMT): 2004-11-05 22:46:22
[IMAGE]JL Audio 300/4 4 Channel Amplifier
Brand new item, NEVER OPENED!!
This Auction is for ONE (1) JL Audio 300/4 4-Channel Amplifier
BRAND NEW IN BOX
[IMAGE]
Performance
The 300/4’s rather unusual power ratings are attributed to the fact
that the amp has three internal DC rail voltage settings, which are
approximately 57 volts, 50 volts, and 43 volts. The upper range is
automatically selected when the amp is turned on, then, based on the
amount of current drawn, one of the lower ranges may be engaged. Of
course, the amount of current being drawn depends upon the load. So
there you have it, three different loads with the same power rating -
good old Ohm’s Law in action again. I have a feeling that most of
the criticism surrounding this rail-switching feature stems from the
fact that it switches down rather than up.
Car audio people don’t like less — they like more. The problem is
that you’re getting more; you’re just looking at it from the wrong
way around. Think of it as one of those “high current†amps that
has enough sense to know when it’s not driving a low impedance load.
The amp uses the higher rail voltages to increase current flow, and,
therefore, power, into higher impedances.
So, how does it perform? Overall, very well, but we did run into a
quirk or two during our 10.5VDC power response sweeps. When driving
all channels into 4 ohms at this power supply voltage, the 450/4 goes
into some type of mild oscillation just as the output signal begins to
clip. While this characteristic doesn’t seem particularly ominous,
it does prevent a solid measurement. With all channels driving 2 ohms
and a 10.5-volt supply, the amp goes into a protection mode that
reduces the signal just before it reaches clipping. This is why both
of our “Power @ 1%†charts are short one trace. I should point out
that despite the fact that we couldn’t get a clear cut measurement,
the output power just before either of these conditions occurs is very
close to what was measured with higher supply voltages — this amp is
very tightly regulated.
As with any amp that acts a bit unconventional on the bench, we
couldn’t wait to try the 450/4 with music and real speakers. We
figure our readers really need to know how the amp is going to work
with speakers and music as opposed to test tones on a lab bench. We
cranked a wide variety of program material into every one of the
450/4’s rated loads while monitoring the amp’s rail voltage. As we
might have guessed, it performed beautifully during this real-world
test. Despite our best efforts to confuse it, we never got it to do
anything that it wasn’t supposed to do.
Note one point to seriously consider: Take a close look at the
reactive power vs. the resistive power. On a real speaker, as opposed
to a bench resistor, this amp really performs, to the tune of almost a
doubling of power. The adaptive power supply scores some extra points
where it matters — driving speakers.
Beyond these points, I’m going to leave you with the spec sheet; it
pretty much speaks for itself. While most of the numbers are very
good, a few, like the turn-on/off specs of about 0.5dB SPL, make it
all the way to superb.
Connections & Adjustments
Everyone already knows how this list goes, so I’m going to talk
about what’s cool rather than what’s there. First, the input
sensitivity is a (manually) switchable dual range set-up. Low
sensitivity range is spec’ed at 800mV to 8 volts, and high range is
speced at about 200Mv to 2 volts. This makes the control much less
sensitive to small adjustments. Ever try to find the 6-volt
sensitivity setting on a single adjustment that goes from 200mV to 8
volts? Second, the 450/4 has, by far, the coolest crossover in the
automotive amplifier industry. It allows you to select either 12 dB-
or 24 dB-per-octave filter slopes, it will operate in either high- or
low-pass mode with a crossover point anywhere between about 55 Hz and
5 kHz, and there is a fully functional filter set on each pair of
channels.
The best part, though, is the accuracy with which the crossover can be
set. Most amps include some type of scale on all of their adjustments,
which usually takes the form of a screen-printed legend on the
amplifier chassis, or end plate. To say the least, this approach
provides little more than a general idea as to the actual crossover
point. JL went two steps further by implementing a detented adjustment
and a 10x range switch. The 450/4’s manual lists the exact crossover
frequency at each detent between 58 Hz and 542 Hz. Kicking in the 10 x
range switch multiplies whatever setting you have by a factor of ten,
again allowing a wide range of operation without an overly sensitive
adjustment. While crossovers can be set by ear, and there are times
when a mismatched setting might be beneficial, it’s hard to argue
against knowing exactly where you are from the get-go.
Installation
But wait, there’s more. Ever notice that all of the RCA cables in
this industry come with connectors that are way too tight and that all
of the input connectors on amps are flimsy circuit board-mounted
things? Guess JL did too, that’s probably why they chose to use real
connectors on the 450/4. They are mounted on the circuit board, but
they are also securely mounted to the amp’s chassis with a large nut
around each connector rather than a tiny screw in the plastic between
the connectors. Most amps require a gentle touch in this area, but the
450/4 would likely survive a hammer blow to the input RCA’s. The
450/4 is also thankfully devoid of chassis-mounted fuses. If you fuse
the amp properly, at the battery, there’s really no reason for more
fuses at the amp. Let’s see, it has a real heat sink, those neat
looking captive-style power and speaker connections, and did I mention
the crossover...
Manual
Straight up, I quit talking about owner’s manuals because most of
them really, really suck. However, this is one that’s worth your
time.
SPECIFICATIONS:Channels 1 & 2
Rated Power (stereo)
150w RMS x 2 @ 1.5 - 4 Ohms (11V-14.5V)
Rated Power (bridged)
300w RMS x 1 @ 3 - 8 Ohms (11V-14.5V)
THD at Rated Power: <0.03% @ 4 ohms per channel
Signal to Noise Ration > 108.5 dB referred to rated power.
Frequency Reponse - 5Hz - 30KHz
Dampning Factor - >200 @ 4 Ohms per channel./50HZ >100 @ 2 Ohms per
Channel/50HZ
Slew Rate - +/- 25V/us
CH 1/2 Filter: State-variable, 12Db
SHIPPING AND PAYMENT TERMS:
Shipping and Handling is 10GBP .
A Winning bid is a contract, a failure to follow through
with payment will be investigated by Ebay for further
actions.
I accept payments through Paypal CONFIRMED ADDRESS ONLY,
Personal Checks. Paypal Address is Sales@IndoAudiouk.com
Please feel free to contact me via Email at
Sales@IndoAudiouk.com or by calling 07821268170 with ANY
further questions!
THANKS AND HAPPY BIDDING!
[IMAGE]
Powered by eBay Turbo Lister
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JL Audio 450/4 SLASH SERIES 4 Channel Amplifier New 04
Last Price: GBP369.00
Ending Date and Time (GMT): 2004-11-05 22:46:29
[IMAGE]
JL Audio 450/4 4 Channel Amplifier
STAGGERED POWER CONFIGURATION!
Brand new item, JUST RELEASED!
This Auction is for ONE (1) JL Audio 450/4 4-Channel Amplifier
BRAND NEW IN THE BOX
[IMAGE]
Performance
The 450/4’s rather unusual power ratings are attributed to the fact
that the amp has three internal DC rail voltage settings, which are
approximately 57 volts, 50 volts, and 43 volts. The upper range is
automatically selected when the amp is turned on, then, based on the
amount of current drawn, one of the lower ranges may be engaged. Of
course, the amount of current being drawn depends upon the load. So
there you have it, three different loads with the same power rating -
good old Ohm’s Law in action again. I have a feeling that most of
the criticism surrounding this rail-switching feature stems from the
fact that it switches down rather than up.
Car audio people don’t like less — they like more. The problem is
that you’re getting more; you’re just looking at it from the wrong
way around. Think of it as one of those “high current†amps that
has enough sense to know when it’s not driving a low impedance load.
The amp uses the higher rail voltages to increase current flow, and,
therefore, power, into higher impedances.
So, how does it perform? Overall, very well, but we did run into a
quirk or two during our 10.5VDC power response sweeps. When driving
all channels into 4 ohms at this power supply voltage, the 450/4 goes
into some type of mild oscillation just as the output signal begins to
clip. While this characteristic doesn’t seem particularly ominous,
it does prevent a solid measurement. With all channels driving 2 ohms
and a 10.5-volt supply, the amp goes into a protection mode that
reduces the signal just before it reaches clipping. This is why both
of our “Power @ 1%†charts are short one trace. I should point out
that despite the fact that we couldn’t get a clear cut measurement,
the output power just before either of these conditions occurs is very
close to what was measured with higher supply voltages — this amp is
very tightly regulated.
As with any amp that acts a bit unconventional on the bench, we
couldn’t wait to try the 450/4 with music and real speakers. We
figure our readers really need to know how the amp is going to work
with speakers and music as opposed to test tones on a lab bench. We
cranked a wide variety of program material into every one of the
450/4’s rated loads while monitoring the amp’s rail voltage. As we
might have guessed, it performed beautifully during this real-world
test. Despite our best efforts to confuse it, we never got it to do
anything that it wasn’t supposed to do.
Note one point to seriously consider: Take a close look at the
reactive power vs. the resistive power. On a real speaker, as opposed
to a bench resistor, this amp really performs, to the tune of almost a
doubling of power. The adaptive power supply scores some extra points
where it matters — driving speakers.
Beyond these points, I’m going to leave you with the spec sheet; it
pretty much speaks for itself. While most of the numbers are very
good, a few, like the turn-on/off specs of about 0.5dB SPL, make it
all the way to superb.
Connections & Adjustments
Everyone already knows how this list goes, so I’m going to talk
about what’s cool rather than what’s there. First, the input
sensitivity is a (manually) switchable dual range set-up. Low
sensitivity range is spec’ed at 800mV to 8 volts, and high range is
speced at about 200Mv to 2 volts. This makes the control much less
sensitive to small adjustments. Ever try to find the 6-volt
sensitivity setting on a single adjustment that goes from 200mV to 8
volts? Second, the 450/4 has, by far, the coolest crossover in the
automotive amplifier industry. It allows you to select either 12 dB-
or 24 dB-per-octave filter slopes, it will operate in either high- or
low-pass mode with a crossover point anywhere between about 55 Hz and
5 kHz, and there is a fully functional filter set on each pair of
channels.
The best part, though, is the accuracy with which the crossover can be
set. Most amps include some type of scale on all of their adjustments,
which usually takes the form of a screen-printed legend on the
amplifier chassis, or end plate. To say the least, this approach
provides little more than a general idea as to the actual crossover
point. JL went two steps further by implementing a detented adjustment
and a 10x range switch. The 450/4’s manual lists the exact crossover
frequency at each detent between 58 Hz and 542 Hz. Kicking in the 10 x
range switch multiplies whatever setting you have by a factor of ten,
again allowing a wide range of operation without an overly sensitive
adjustment. While crossovers can be set by ear, and there are times
when a mismatched setting might be beneficial, it’s hard to argue
against knowing exactly where you are from the get-go.
Installation
But wait, there’s more. Ever notice that all of the RCA cables in
this industry come with connectors that are way too tight and that all
of the input connectors on amps are flimsy circuit board-mounted
things? Guess JL did too, that’s probably why they chose to use real
connectors on the 450/4. They are mounted on the circuit board, but
they are also securely mounted to the amp’s chassis with a large nut
around each connector rather than a tiny screw in the plastic between
the connectors. Most amps require a gentle touch in this area, but the
450/4 would likely survive a hammer blow to the input RCA’s. The
450/4 is also thankfully devoid of chassis-mounted fuses. If you fuse
the amp properly, at the battery, there’s really no reason for more
fuses at the amp. Let’s see, it has a real heat sink, those neat
looking captive-style power and speaker connections, and did I mention
the crossover...
Manual
Great, Detailed, and nicely designed manual.
SPECIFICATIONS:Channels 1 & 2
Rated Power (stereo)
150w RMS x 2 @ 1.5 - 4 Ohms (11V-14.5V)
Rated Power (bridged)
300w RMS x 1 @ 3 - 8 Ohms (11V-14.5V)
THD at Rated Power: <0.03% @ 4 ohms per channel
Signal to Noise Ration > 108.5 dB referred to rated power.
Frequency Reponse - 5Hz - 30KHz
Dampning Factor - >200 @ 4 Ohms per channel./50HZ >100 @ 2 Ohms per
Channel/50HZ
Slew Rate - +/- 25V/us
CH 1/2 Filter: State-variable, 12dB octave butterworth or 24dB octave
linkwitz riley low pass or high pass with continuous variable cutoff
freq. from 50-500 HZ switchable to a range of 500-5000 Hz via x10
swtich. Can also be cascaded from Channel 3&4 filters cutoff freq. to
operate a bandpass filter for tri-amp configurations. Defeatable.
Channels 3 & 4
Rated Power (stereo)
75w RMS x 2 @ 1.5 - 4 Ohms (11V-14.5V)
Rated Power (bridged)
150w RMS x 1 @ 3 - 8 Ohms (11V-14.5V)
THD at Rated Power: <0.03% @ 4 ohms per channel
Signal to Noise Ration > 108.5 dB referred to rated power.
Frequency Reponse - 5Hz - 30KHz
Dampning Factor - >200 @ 4 Ohms per channel./50HZ >100 @ 2 Ohms per
Channel/50HZ
Slew Rate - +/- 25V/us
CH 1/2 Filter: State-variable, 12dB octave butterworth or 24dB octave
linkwitz riley low pass or high pass with continuous variable cutoff
freq. from 50-500 HZ switchable to a range of 500-5000 Hz via x10
swtich. Can also be cascaded from Channel 3&4 filters cutoff freq. to
operate a bandpass filter for tri-amp configurations. Defeatable.
SHIPPING AND PAYMENT TERMS:
Shipping and Handling is 10GBP .
A Winning bid is a contract, a failure to follow through
with payment will be investigated by Ebay for further
actions.
I accept payments through Paypal CONFIRMED ADDRESS ONLY,
Personal Checks. Paypal Address is Sales@IndoAudiouk.com
Please feel free to contact me via Email at
Sales@IndoAudiouk.com or by calling 07821268170 with ANY
further questions!
THANKS AND HAPPY BIDDING! [IMAGE]
Powered by eBay Turbo Lister
Pioneer GM-X924 4 channel amplifier
Last Price: GBP52.05
Ending Date and Time (GMT): 2004-11-02 21:49:02
You are bidding on a used pioneer gm-x924 amp. This amp is fully
working and was taken out of my car when I sold it. The amp can be
used as a 2,3 or 4 channel and is quite adequate for running a stereo
sytem in most cars. the amp has the following spec:
1 Ohm Stable Operation
Balanced Isolator Input Circuit
Bridgeable 2/3/4 Channel Capability
Class A Circuitry
Continuous Power (20Hz-20kHz, 0.08% THD)
Dual-Fan Cooling
Frequency Response: 10Hz - 50kHz (0,-1dB)
Gold-Plated RCA Inputs (x2)
Gold-Plated RCA Outputs (Pass-Thru)
Gold-Plated Screw-Type Power/Ground Terminals
Gold-Plated Screw-Type Speaker Terminals
Hi-Volt Input Level Control (400mV-6.5V)
Maximum Power (EIAJ)
PWM Regulated MOSFET Power Supply
Signal-to-Noise Ratio: 105dB (IHF-A Weighted, at 1kHz)
Top Mount Controls
Total Harmonic Distortion: 0.003% (1kHz, 4 Ohm)
Variable Crossovers: 50-120Hz, -12dB/oct. (LPF/HPF) (Front & Rear
Channels)
Dimensions: 10" x 2-3/8" x 12-3/8"
Please only bid if you want to buy. payment must be made within 7
days by either bank transfer, Paypal, Nochex payment or postal
orders. Negative feedback will be left if these terms are not
followed.
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