Bridged mono two speakers and a microphone
This is the procedure for matching amplifier to speakers guide according to current standards. Just go below to the step by step guide to understand everything in five minutes. We start defining Ohms and Watts according to current standards too. Basically, amplifiers often also called amps amplify an audio signal so that the desired level is emitted from the loudspeakers. We have to start explaining what are Ohms and Watts. Once this is understood, the rest of the matching amplifier to speakers guide becomes very simple.
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PA setup run Mono vs. Stereo
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I have a stereo amp LA and is currently wired in a standard stereo circuit. Recently, I read an updated answer from one of my questions stating that wiring the amp in bridged mode doubles the voltage swing on the speaker compared to the other.
I have three questions:. Sound is transmitted through the air as variations in pressure. When a guitar string vibrates, a drum skin is hit or the vocal chords vibrate the air pressure oscillates a little around atmospheric pressure causing alternating compression and rarifaction of the air.
A microphone detects these air vibrations and converts them to electrical signals. With no sound the microphone gives out 0 V. When it picks up a sound it gives out an alternating voltage going positive and negative with the air pressure. The electrical signal is an "analogue" as in analogy of the sound signal, hence "analog electronics" and "analog amplifier". The alternating nature of the analog signal poses a problem for the electronics designer.
Since the audio signal alternates around 0 V the amplifier circuits must too. To allow this a dual supply is required. Figure 1. Note that there are no capacitors in the signal path. Note also that this amplifier has no capacitors in the signal path. That means that it can amplify "right down to DC" or, more relevant for audio, there is no fall-off in amplification at bass frequencies.
There are many cases where only a single supply rail is available. The 12 V electrical supply of a car is an obvious one.
The circuit of Figure 1 would not be able to handle negative signals and would distort terribly. To get around this we introduce a DC offset into the audio signal while it runs through our 12 V electronics. Typically this is about half of the supply voltage or 6 V for the 12 V system. But we've lost something! One way to improve the situation here is to lower the speaker resistance. Figure 3. A simplified version of a pair of amplifiers in bridge-mode. Note that one amplifier is non-inverting and the other is inverting.
Ears are the best devices for this. If you carefully press the speaker cone from the front or rear it will deflect and will return to the centre position due to the suspension arrangement which acts as a spring. When you overdrive your speakers you will approach the limits of the suspension where it no longer performs linearly or even hits a hard stop such as when the voice-coil hits the bottom of the slot in the magnet.
Figure 4. A loudspeaker cut-away. Source: Wikimedia commons. Over-driving as described above will result in audible distortion which generates harmonics multiples of the frequencies present in the sound. This will make the output sound harsh and this effect is used by guitarists either by deliberately overdriving their speakers or using guitar effects units to create the effect.
High quality speakers may have tweeters for the high frequency signals. As the harmonics may be above the limits of human hearing the distortion may not be noticable so caution is urged. Of course, you can read the datasheet for the speakers and calculate the maximum signal levels that should be applied. If you wish to study further you should be able to find some MP3 sinewaves of various frequencies to play through your system. Alternatively a signal generator app for your phone would allow you to do all sorts of frequencies, sweeps, white noise, etc, and a spectrum analyzer app would allow you to check the response from your speakers.
It means the same as peak-to-peak amplitude. Typically this makes it louder, alternatively it allows using a loudspeaker that has four times higher resistance to produce the same loudness. When you need more amplitude and boosting the amplifier input doesn't work eg because that would cause clipping Especially when using a higher voltage for the amplifier power-supply is not convenient.
When you can just turn up the volume knob instead or add a pre-amplifier. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Stereo or bridged mono? LA Ask Question.
Asked 3 years, 1 month ago. Active 3 years, 1 month ago. Viewed times. I have three questions: What are voltage swings? What are the benefits of a higher voltage swing on the speaker? When should I switch to a bridged setup? When shouldn't I? Ground Ground 6 6 bronze badges. Add a comment.
Active Oldest Votes. Dual-rail power supply The alternating nature of the analog signal poses a problem for the electronics designer. Single-rail power supply There are many cases where only a single supply rail is available. The amplifier modified for a single supply rail. R1 and R2 provide a 6 V DC bias to the amplifier. C1 de-couples the input signal. We need to avoid feeding the 6 V DC to the speaker as it would push or pull the speaker cone off-centre and cause some audio distortion as well as wasting half of the possible cone excursion and heating the voice coil.
C2 does this as it blocks the DC voltage. It will also attenuate the bass frequencies though so it has to be large enough to present a low impedance at the lowest audio frequencies.
The calculation will give you a largish C value so an electrolytic capacitor is normally chosen. Bridged mode simulate this circuit Figure 3. Main points: We're still working on a single supply so the input decoupling capacitor and biasing resistors are still required.
The biasing arrangement can be done inside the chip if it's designed for single-rail operation. We need two amplifiers for bridge mode. The voltage across the speaker will be zero and no current will flow. The maximum on a negative input will be -8 V across the speaker. It's not quite as good as the split-rail version but a lot better than that of Figure 2.
Again note that the amplifiers require higher current capacity. The output decoupling capacitor is gone so the low-frequency roll-off is determined by C1 only. What are voltage swings? I think I've covered that.
What are their benefits of a higher voltage swing on the speaker? More power. Use bridged mode if you need more power but are constrained by the supply voltage. You need to design properly and check that the amplifiers are suited for bridge mode.
Read the datasheets and what the minimum speaker impedance is. If, for some reason, your speaker needs a ground connection then you can't use a bridge configuration. This would be an unusual constraint. From the comments: How can I know that this kind of setup won't damage my speakers? Transistor Transistor k 11 11 gold badges silver badges bronze badges. In any case I haven't even answered your question yet.
I have only given background information. Yes, hence my comment at the bottom. The real answer is coming. I've probably introduced some new terminology - although I tried to pitch it about right for you. Learn the words and their context. You'll see them in other places and stuff will start to fall into place.
How to Check if your Speakers are Wired Correctly
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Amplifier Modes: Stereo vs Parallel vs Bridge Mono
While setting up your amplifier, you may come across switches that allow you to configure the amp in different ways. The most common setup is stereo mode for using a multi-channel amplifier. Stereo is the mode you should use if you just want each channel of your amplifier to act independently. In this example of a two-channel amplifier in stereo mode, Input 1 is routed to Channel A and Input 2 is routed to Channel B. Parallel mode is similar to stereo, but slightly different. You might choose parallel mode if you wanted the same signal to be played through both amplifier channels. While the two amplifiers work separately in both stereo and parallel mono mode, they work together in bridged mono mode. This mode harnesses the power of both amplifier channels to provide much more power than either one of them could provide alone! In bridged mono mode, Input 1 is routed to both Channel A and Channel B, just like parallel mono mode. However, bridged mono mode is different in a few very important ways.
Stereo, Parallel, and Bridge Mono Modes in Amplifiers
Any system is only as good as the weakest link in the chain and audio systems are certainly no exception to the rule. Attaching speakers to your Hi-Fi system usually only requires a few cables. These potential problems are easy to spot with a few simple tests and luckily the corresponding remedies are equally simple. In the grand scale of things, getting your left and right speakers mixed up is not a major problem. Record producers and mix engineers spend weeks mixing and producing an album and as part of the process they will decide where in the mix to place certain instruments.
Wiring audio inputs and outputs
This revolutionary award-winning amplifier is designed as a two-channel amplifier using class D amplifier technology. It can be used for powering low impedance stereo systems with a maximum power of 2 x 40 Watt, while bridging to a constant voltage V and 70V is possible with a maximum output power of 80 Watt. A switch-mode power supply allows a wide variation of main voltages for global compatibility. Typical applications are the implementation of an audio streaming module or internet radio module. Additionally, a stereo line input allows connection for any kind of external audio sources. A priority switch overrides the background music when enabled and compatibility with line-level sources e.
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When choosing a set of speakers for your home theater, start with the center channel. Choose a center channel speaker that fits your space as well as your budget. Next, choose the front left and right speakers.
AudioControl Director and Architect series amplifiers have the capability to bridge amplifier channels together to deliver more power to your speakers. Bridging amplifier channels combines a stereo pair of channels into a single mono channel. All stereo amplifier channel pairs on Director and Architect amps are capable of being bridged. This means that a bridged amp driving an 8 ohm speaker is actually operating into a 4 ohm load. Also, make sure your speakers are rated to handle the increased power that is provided by bridging. The Architect Model bridged power rating is watts.
Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. I have a stereo amp LA and is currently wired in a standard stereo circuit. Recently, I read an updated answer from one of my questions stating that wiring the amp in bridged mode doubles the voltage swing on the speaker compared to the other. I have three questions:. Sound is transmitted through the air as variations in pressure.
There seems to be a problem serving the request at this time. Every DJ should understand that one the most important components to powerful audio equipment is the DJ speakers. Audio equipment will use either active or passive DJ speakers, and knowing the difference is a skill set that every DJ should have. Each speaker has its own separate volume controls and plugs directly into the mixer.
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