The AudioControl LC7i, six channel active line converter, allows all music lovers, who want a great in-car audio experience, to keep their factory installed source unit and dramatically improve their system performance. The LC7i delivers amazing sound quality and fixes one of the biggest letdowns of today's factory systems, weak BASS!
- Propervolume 1 1 3 – Audio Volume Input Output Control Levels In Blood
- Propervolume 1 1 3 – Audio Volume Input Output Control Levels Normal Range
- Propervolume 1 1 3 – Audio Volume Input Output Control Levels Explained
- Propervolume 1 1 3 – Audio Volume Input Output Control Levels Indicate
Designed for maximum sound quality and enhanced audio performance, the LC7i incorporates AccuBASS™. This patented process automatically corrects for the bass roll-off that is common with many factory-installed audio systems and AudioControl's unique and exclusive AccuBASS™ circuitry maintains and restores the Bass as the volume is turned up, improving the audio performance.
Cornerstone 401k login. The LC7i allows the flexibility of powering the audio signals downstream to single or multiple factory amps maximizing sound quality & achieving high output at a great price. In addition, the LC7i is designed to fit into a compact chassis allowing an easy & flexible factory system upgrade in today's space constrained vehicles. The ACR-1 dash remote (sold separately) allows the user to control the level of the low frequency output.
FEATURES
- Six channels of active speaker level inputs – accepts up to 400 watts per channel
- Patent Pending AccuBASS™ circuitry
- Optional ACR-1 Remote allows for user control of the subwoofer level
- Internal Channel Summing – For interfacing with factory installed amplifiers with built-in crossovers
- GTO™ (Great Turn-On) Circuit – Powers up the LC7i when it detects signal on the speaker level input
- Output level control
- Compact chassis allowing for ease of installation
INPUTS
Source selection is via the small switch by the volume control knob. Photograph 3: Rear - DIY Stepped Attenuator Volume Control. The insides of the unit are almost as tidy as the outside. Here is a shot of the interior of the unit prior to base installation. Photograph 4: Inside - DIY Stepped Attenuator Volume Control. Wiring is a little tight. Digital audio levels are measured differently than analog audio levels. Yes, yet another and different dB system is used. The dB system in digital audio starts at the top and defines the loudest sound level that is to be digitized. This top or full scale view of the audio levels results in a full scale or 'FS' system of dB measurement. How can I control the System Volume Setting of Windows 10? Which Libary I need? I am using Visual Basic 2015 and wanna programm a Windows Universal App with C#. The programm should be able to: Set Systemvolume to x% increase the Systemvolume by x. Decrease the Systemvolume by x. Get the current Systemvolume. Understand the differences between mic level, line level and speaker level. Understand why you need a microphone pre-amp or an attenuator. Volume Controls.; 3 minutes to read; In this article. Clients that manage shared-mode streams typically use the ISimpleAudioVolume and IAudioSessionEvents interfaces in WASAPI to control and monitor the stream volume levels. Through the methods in the ISimpleAudioVolume interface, the client can get and set the volume levels of the audio sessions that the shared-mode streams belong to.
- Speaker Level Inputs: 3 (6 channels)
- Maximum Input (speaker level): 400W per channel at 4Ω
- Input Impedance: 20kΩ
OUTPUTS
- Preamp Outputs: 3 (6 channels)
- Maximum Output Level: 8.5Vrms
- Output Gain: ±12dB
- Output Impedance: 150Ω
PERFORMANCE
- Total Harmonic Distortion: 0.01%
- Frequency Response: 10Hz-22kHz
CONTROL
- Remote In
- 12VDC Remote Out (always active when unit is on)
Propervolume 1 1 3 – Audio Volume Input Output Control Levels In Blood
GENERAL
- Power Supply: High Headroom PWM Switching
- Current Draw: 350mA
- Recommended Fuse Rating: 2A
WEIGHTS & DIMENSIONS
- Dimensions: 7.5'W x 4.7'D x 1.2'H
- Weight: 1.5 lbs (0.7 kg)
IN THE BOX: LC7i, Speaker and Power connectors, Manual, Warranty
Volume and Loudness Controls.
Oh, yes, there are some modern amplifiers and receivers that don't have a rotary control in sight and use digital technology to operate these functions. These employ a digital to analog converter to convert the number to a voltage and this DC level is fed to a voltage controlled volume control.A pot is a resistor with a sliding tap. As you turn the control you are moving the tap up and down the resistor. The schematic symbol is shown a ways down this page. A pot has three terminals. In the photo (below) of a disassembled pot the thing in the center is the resistance element with the solder terminals, The thing on the left is the part that turns and the thing on the right is what the shaft (left) fits into.
The resistance element is the dark gray arc (center) which has its ends connected between the two outside terminals. The movable contact takes the long way around. The center of the three terminals is connected to the circular metal contact inside the resistance element. On the left you see a brassy looking contact which is insulated from the metal shaft. The resistance element when turned over fits down over the shaft. The brass contact just to the right of the shaft makes contact with the metal ring which is connected to the center solder lug. The brass contact just to the left of the shaft, which is a little farther from the shaft than the one on the right, makes contact to the dark gray resistance element. As the shaft is rotated this contact touches a different part of the resistance element and causes the contact point to be connected to the center solder lug. If the pot is a linear taper, and the shaft is set half way between the two extremes, the resistance from each end of the resistance element to the center terminal will be half of the total resistance.
Linear and Audio Taper.
The taper of a pot refers to the way its resistance changes as the shaft is rotated. A linear taper pot is exactly what you would guess it to be, a graph of resistance (from one end to center) versus shaft rotation would be a straight line. If you tried to use a linear taper pot as a volume control you would be most unhappy with its performance. The sound level would go from nothing to almost full volume in about the first ten degrees of rotation and the rest would have almost no audible effect. This is because the ear responds to sound logarithmically rather than linearly. That's why sound engineers use the decibel which is a logarithmic function of power. An audio taper pot has a function which approximates a logarithmic function.The way to identify an audio taper pot is to set it to half rotation and measure from center to each end with an ohmmeter. If the resistances are approximately equal you have a linear pot. If the resistance from the counter clockwise end to center is about 10% of the total and the resistance from the clockwise end to the center is about 90% then you are holding an audio taper pot.
These are the major kinds of tapers used in home audio equipment. There are other ones but they are of little interest to us. One to look out for is the reverse audio taper. It has 10% resistance between the clockwise end and the center. This type was used as a contrast control in older black and white TV sets. Be observant when testing pots or you might be fooled.
If you are still not satisfied, here is more information about pots than you ever knew existed.
The Volume Control
The volume control is nothing more than an audio taper pot connected as a voltage divider. The circuit is shown here. When the control is fully clockwise the sliding contact (arrow in the schematic symbol) is all the way to the top of the resistor. What ever voltage is applied to the input terminals, that same voltage will appear at the output terminals.For a verbal description click here.
If the pot is set to half resistance, NOT half rotation, half of its resistance is above the sliding contact and the other half is below the slider. The input voltage is always applied across the entire resistor. the voltage distributes evenly along the resistance so if the output is connected across 1/2 of the resistor the output voltage will be 1/2 of the input voltage. That applies whether the slider is set to 1/4, 1/10 or 1/100 of the resistance. Remember that 1/2 rotation is 1/10 resistance so at this setting the output voltage is 1/10 of the input voltage.Propervolume 1 1 3 – Audio Volume Input Output Control Levels Normal Range
The Loudness Control
The loudness control uses a special pot which has a fixed tap at 1/2 rotation. Pots for this application can easily be identified by a fourth terminal on the opposite side from the usual three.When loudness is switched off C1 is disconnected and C2 is shorted out. R1 in combination with the resistance of the lower half of the pot gives an attenuation which is equal for all frequencies.
Pots designed for use as loudness controls usually have 1/3 of the resistance between the counter clockwise end and center. The resistance becomes 1/10 of total when the loudness network is connected. That will give a maximum of 10 dB bass boost.
Loudness, Fact or Fraud?
When listeners are tested under laboratory conditions it can be demonstrated that as the total volume decreases the base and treble must be boosted in order for the music to sound the same. This effect kicks in at moderate volume and operates from there downward. However as it is universally implemented in stereo amplifiers the loudness control works from maximum volume down to one half rotation on the control. That is, at maximum volume the frequency response is flat and as the control is rotated from there down the lows and highs begin to be boosted. At half rotation the boost is as high as it can get. Once the slider gets below half, there is no more change in the relative amplitudes of high, low and mid frequencies. On most stereos half volume is still pretty loud so the designers have it backwards. The loudness control effect should operate in the lower half of control rotation instead of in the upper half as it does. Conclusion: Fraud! I turn my loudness control off and use the bass and treble controls to get the sound I want at the particular listening level.Propervolume 1 1 3 – Audio Volume Input Output Control Levels Explained
Or use your 'Back' button to return to where you were.
Propervolume 1 1 3 – Audio Volume Input Output Control Levels Indicate
Oh, yes, there are some modern amplifiers and receivers that don't have a rotary control in sight and use digital technology to operate these functions. These employ a digital to analog converter to convert the number to a voltage and this DC level is fed to a voltage controlled volume control.A pot is a resistor with a sliding tap. As you turn the control you are moving the tap up and down the resistor. The schematic symbol is shown a ways down this page. A pot has three terminals. In the photo (below) of a disassembled pot the thing in the center is the resistance element with the solder terminals, The thing on the left is the part that turns and the thing on the right is what the shaft (left) fits into.
The resistance element is the dark gray arc (center) which has its ends connected between the two outside terminals. The movable contact takes the long way around. The center of the three terminals is connected to the circular metal contact inside the resistance element. On the left you see a brassy looking contact which is insulated from the metal shaft. The resistance element when turned over fits down over the shaft. The brass contact just to the right of the shaft makes contact with the metal ring which is connected to the center solder lug. The brass contact just to the left of the shaft, which is a little farther from the shaft than the one on the right, makes contact to the dark gray resistance element. As the shaft is rotated this contact touches a different part of the resistance element and causes the contact point to be connected to the center solder lug. If the pot is a linear taper, and the shaft is set half way between the two extremes, the resistance from each end of the resistance element to the center terminal will be half of the total resistance.
Linear and Audio Taper.
The taper of a pot refers to the way its resistance changes as the shaft is rotated. A linear taper pot is exactly what you would guess it to be, a graph of resistance (from one end to center) versus shaft rotation would be a straight line. If you tried to use a linear taper pot as a volume control you would be most unhappy with its performance. The sound level would go from nothing to almost full volume in about the first ten degrees of rotation and the rest would have almost no audible effect. This is because the ear responds to sound logarithmically rather than linearly. That's why sound engineers use the decibel which is a logarithmic function of power. An audio taper pot has a function which approximates a logarithmic function.The way to identify an audio taper pot is to set it to half rotation and measure from center to each end with an ohmmeter. If the resistances are approximately equal you have a linear pot. If the resistance from the counter clockwise end to center is about 10% of the total and the resistance from the clockwise end to the center is about 90% then you are holding an audio taper pot.
These are the major kinds of tapers used in home audio equipment. There are other ones but they are of little interest to us. One to look out for is the reverse audio taper. It has 10% resistance between the clockwise end and the center. This type was used as a contrast control in older black and white TV sets. Be observant when testing pots or you might be fooled.
If you are still not satisfied, here is more information about pots than you ever knew existed.
The Volume Control
The volume control is nothing more than an audio taper pot connected as a voltage divider. The circuit is shown here. When the control is fully clockwise the sliding contact (arrow in the schematic symbol) is all the way to the top of the resistor. What ever voltage is applied to the input terminals, that same voltage will appear at the output terminals.For a verbal description click here.
If the pot is set to half resistance, NOT half rotation, half of its resistance is above the sliding contact and the other half is below the slider. The input voltage is always applied across the entire resistor. the voltage distributes evenly along the resistance so if the output is connected across 1/2 of the resistor the output voltage will be 1/2 of the input voltage. That applies whether the slider is set to 1/4, 1/10 or 1/100 of the resistance. Remember that 1/2 rotation is 1/10 resistance so at this setting the output voltage is 1/10 of the input voltage.Propervolume 1 1 3 – Audio Volume Input Output Control Levels Normal Range
The Loudness Control
The loudness control uses a special pot which has a fixed tap at 1/2 rotation. Pots for this application can easily be identified by a fourth terminal on the opposite side from the usual three.When loudness is switched off C1 is disconnected and C2 is shorted out. R1 in combination with the resistance of the lower half of the pot gives an attenuation which is equal for all frequencies.
Pots designed for use as loudness controls usually have 1/3 of the resistance between the counter clockwise end and center. The resistance becomes 1/10 of total when the loudness network is connected. That will give a maximum of 10 dB bass boost.
Loudness, Fact or Fraud?
When listeners are tested under laboratory conditions it can be demonstrated that as the total volume decreases the base and treble must be boosted in order for the music to sound the same. This effect kicks in at moderate volume and operates from there downward. However as it is universally implemented in stereo amplifiers the loudness control works from maximum volume down to one half rotation on the control. That is, at maximum volume the frequency response is flat and as the control is rotated from there down the lows and highs begin to be boosted. At half rotation the boost is as high as it can get. Once the slider gets below half, there is no more change in the relative amplitudes of high, low and mid frequencies. On most stereos half volume is still pretty loud so the designers have it backwards. The loudness control effect should operate in the lower half of control rotation instead of in the upper half as it does. Conclusion: Fraud! I turn my loudness control off and use the bass and treble controls to get the sound I want at the particular listening level.Propervolume 1 1 3 – Audio Volume Input Output Control Levels Explained
Or use your 'Back' button to return to where you were.
Propervolume 1 1 3 – Audio Volume Input Output Control Levels Indicate
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This site begun March 14, 2001
This page last updated September 9, 2005.
