This allows you to use the rear channels for speakers, tweeters, full-range coaxials, or even subwoofers. The rear channels have a selectable filter setting for LPF, HPF, or FR. This is because front channels are typically always used for speakers. You might notice that on the THUNDER75.4 amplifier, the front channels are factory set to High Pass Frequencies. For example, if you are using full range coaxial speakers with a subwoofer, there is no need to send low frequencies to your coaxials since your subwoofer will already be playing those frequencies and vice versa. Using the HP crossover setting also focuses the amplifier power on the frequency band that your speakers are suited for. For example, when using smaller speakers such as a 4”, it would be a good idea to use the HP or HPF crossover to protect them from the lower frequencies they are not intended to reproduce. On MTX amplifiers, you can select which type of crossover you want to use based on the kind of speakers you are powering with the amplifier. FR = Full Range means the crossover is going to allow all frequencies to go to all speakers. HPF (sometimes referred to as HP) refers to High Pass Frequencies and is used for speakers and tweeters. For example, LPF (sometimes referred to as LP) refers to Low Pass Frequencies and is used for subwoofers designed to play only the lowest notes. This is why it is useful to have two LEVEL or GAIN settings for a multi-channel amplifier.ĬROSSOVER (X-OVER), is a tuning setting that usually has predetermined frequency ranges depending on the setting you choose. If LEVEL or GAIN is used to level match the output voltage to the head unit, why do you need two settings? Good question… Using Ohm’s Law of V (voltage) = √P (amplifier RMS power rating) x R (resistance of speakers), you can see that if the impedance, or resistance, of the speakers on the front channels is different than the speakers on the rear channels, the gain adjustments will need to be different. On the MTX THUNDER75.4 four-channel amplifier, shown above, there are separate LEVEL or GAIN settings for the FRONT and the REAR speakers. For multi-channel amplifiers designed to power one or more pair of left and right speakers, there are usually two or more LEVEL or GAIN settings. Since “mono-block” amplifiers have only one channel used to power subwoofers, there is only one LEVEL or GAIN dial to set. For more information on how to set your amplifier LEVEL or GAIN – CLICK HERE. If your LEVEL or GAIN is set too high, you will be over amplifying the audio signal and sending a clipped, or distorted, signal to your subwoofers or speakers, which is potentially damaging and doesn't sound good. ![]() Some head units have more output voltage than others, so the LEVEL or GAIN setting on your amplifier allows you to match the output voltage of the amplifier to the signal it is receiving from your head unit. LEVEL or GAIN, is a setting that is used to match the output voltage of your head unit (radio, Bluetooth player, etc) to the output voltage of your amplifier. We are going to discuss most of the basic features that you will find on most amplifiers. MTX Audio THUNDER75.4 4-channel amplifier
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