Output volume varies, with loss of bass and clarity
Audio volume varies, with loss of clarity when on for a little while. If I remove either input channel and only play one channel, it comes back to proper volume. It does the same with either channel disconnected.
Q. Would this be related to the power output stages, and possible just the power tranistors?
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If you have a Phono input it will provide the additional amplification needed for the ceramic cartridge, and perhaps even more amplification for a magnetic cartridge, made available by a switch. It also has extra bass boost to counteract the lack of bass in the recording, done so as to keep the grooves from making use of lots of platter real estate. By minimizing the bass, the recording time is increased.
If you don't have a Phono input, but you have an aux input, you may have to crank the volume and the bass to get reasonable sound, because the phonograph cartridge doesn't produce much output as compared to "line-level" devices such as a line-out on a tape deck.
The realtek chip should come with the HD audio manager in the control panel if the drivers were installed correctly. You'll want to check and make sure the equalization (under the sound effects tab) is set to none, or possibly to treble (I had to use the treble setting on mine if using a sound system with a subwoofer). Another trick to raise the frequency of the audio is to raise the "Karaoke setting which will pitch shift all frequencies upward.
Bass boost simply adds DB or gain to the bass signal. Some like it, some dont.
The frequency knob is the Low Pass Filter (LPF) that cuts off the amp output above
the set frequency. A bass system usually cuts off below 400 HZ and more often 200HZ.
A good, rattle your car bass note is in the 25-80HZ range or lower but most amps and audio
input devices cant attain a good low note with clarity.
"Low-pass filter allows only frequencies below the crossover point to be amplified. A high-pass filter allows only frequencies above the crossover point to be amplified - useful for keeping low bass away from small speakers, so they can play more efficiently."
Checkout Crutchfields Glossary of Car Amps. http://www.crutchfield.com/S-LPyoWWgD5qN/learn/learningcenter/car/amplifiers_glossary.html
If the TV has audio output available, there will be RCA jacks somewhere for that. The standard colors are red for the right channel and white for the left, and they'll be clearly marked as audio outputs. Not all sets have audio outputs, though, while they usually have audio and video inputs. So if you find RCA jacks on the set be sure to see how they are marked.
If the TV has output jacks, all you need is a cable with the appropriate plugs at each end. The TV needs RCA plugs, while the input connector to the speakers varies by manufacturer. Typically the speakers will use a 1/8-inch stereo jack if they were made to be used with a computer, and RCA jacks if they were meant to be used in a home-theater setting. In TV sets with audio outputs, the output may be fixed and independent of the TV volume, which means you can turn the TV volume down and use just the external speakers. Or the audio output may vary with the TV volume, meaning you'll always need to have the TV volume on as well. Some people find this annoying.
If the TV doesn't have an audio output available, you can't hook the speakers to the TV. What most people do in that case is use the TV as a video display in conjunction with an AV receiver. The audio and video sources connect to the receiver, which in turn drives the speakers and provides a video output to the TV.
Does you sound system have an input plug (RCA) of audio?
If does you could buy a cable adaptor that have an output of stereo rca. Plug the stereo jack on your mp3 earphone socket and your ready to play!
If your sound system have no audio input. You should buy a 12 volt amplifier, with an out put of 50 watts( Depends upon your clarity and bass boost) or higher! Use your existing speakers and make sure you buy that audio adaptor cable for your mp3 to connect to your brand new amplifier.
ported is the loudest your going to get as you get sound from the front and the rear of the sub compared to hearing only one side in a sealed or bandpass box.Bandpass boxes are very loud near there tuning frequency but tend to sound offish at tones that aren't near the tuning frequency. The same with ported boxes and the bass will tend to be a little sloppier compared to the tight bass of a sealed enclosure- it comes down to your musical preferences- more sound at the cost of clarity and loss of power handling capability or tighter cleaner bass with added power handling.
If you are not getting sound from any of the 4 channels, I'd suspect that either the amp is not getting an input signal or the amp itself is faulty.
Here's the "no sound" troubleshooting step-by-step procedure from the JL manual:
1) Check the input signal using an AC voltmeter to measure the voltage from the source unit while an appropriate test tone is played through the source unit (disconnect the input cables from the amplifier prior to this test). The frequency used should be in the range that is to be amplified by the amplifier (example; 50 Hz for a sub bass application or 1 kHz for a full range / high-pass application). A steady, sufficient voltage (between 200mV and 5.O-volts) should be present at the output of the signal cables.
2) Check the output of the amplifier. Using the procedure explained in the previous check item (after plugging the input cables back into the amplifier) test for output at the speaker outputs of the amplifier. Unless you enjoy test tones at high levels, it is a good idea to remove the Speaker Connector Plugs from the amplifier while doing this. Turn the volume up approximately half way. 5V or more should be measured at the speaker outputs. This output level can vary greatly between amplifiers but it should not be in the millivolt range with the source unit at half volume. If you are reading sufficient voltage, check your speaker connections as explained below.
3) Check to ensure that the speaker wires are making a good connection with the metal inside the Speaker Connector Plugs. The speaker wire connectors are designed to accept up to 12 AWG wire. Make sure to strip the wire to allow for a sufficient connection with the metal inside each terminal.
The 147 receiver doesnt have an input for a turntable. THe output from a turntable is VERY low and is heavily equalized because of the actual record format ( the bass is cut way down and the highs are boosted.....when run through an actual phono input, it "un does" the equalization by boosting the bass and cutting the treble......this is called the RIAA compensation curve ).
You need wither a receiver with an actual phono input, or a good quality Phono Pre Amp....