It was a nice discovery! Or 2 volts, or 3 volts and so on and so forth. Still a bit confused. Probably 100hz like mentioned. Eric, Either your system is creating a second harmonic overtone, or you're misreading the scale on your oscilloscope's screen. Given my background, they put me to work writing about some of the most complex electronic products Crutchfield sells: car amplifiers, digital signal processors, wiring, professional sound mixers, and PA systems. For most of this discussion, we'll use more simple sine waves. A 4 volt out deck could produce the signal without clipping. When looking at the tones of the Amp with an Oscilloscope do I hook up the Scope to the speaker output with no speaker attached? When it distorts, you can clearly hear it buzz. Take note of the peak voltage (from the reference to the top of the waveform). 1) The receiver's output may not be set to its maximum level short of distortion. Okay so I've been running 2 Infinity Kappa 100.9 W's in a sealed box with passive radiators tune to 27 Hertz and it sounds phenomenal at 600 RMS each even though they're rated for like 375. When you're determining your HU's max clean volume, your gains at that point are at the minimum, right? How do I set my 4 channel Scosche LOC gains connected to a 4 channel amp which is connected to 2 speakers and bridged to a sub? If the bass boost were set back to +6dB, the volume control could be used throughout its range. I will guard the secret with my life I swear. I'm guessing I will be using the tone that clipped the fastest while setting the head unit audio correct? Instead of listening for distortion in music. In the Crutchfield Labs, I ran a set of tests and determined that "doing it by ear and music" works, but not quite as accurately or scientifically as using test tones. I don't know which receiver you have, but you should set its subwoofer output as you would the gain - turn it up until it distorts, then lower it until it's clean. Everything is brand new. Thanks! Then we'd just play a 100hz 0dBfs track with the volume and bass at maximum and set the gains on the amplifier to just below the point where the amp starts clipping. I've since hooked it up to the amp and set the gain using 1000Hz tone for the mids and 40/50 tones for the 8 inch woofers cutting the gain to about 10% before clipping. How do I incorporate remote level control on the amp (SoundStream PN1.650D) in this process? Can you give some suggestions on Oscilloscopes such as types, brands, models? Most manufacturers recommend playing familiar music with the amp gain low, raising the receiver's volume until the music distorts, then backing it off until the music sounds clean again. Using the manufacturer's "nominal" impedance rating will bring the best results. You can download "0-dB" test tones for free from the internet - a web search will turn up a vast selection. For setting a subwoofer amplifier's gain, you can use a 40 or a 60 Hz tone. Lunes 11/23 a miercoles 11/25: 9 AM - 7 PM, Shop smart & save time when you connect with an advisor, Your advisor will be able to share relevant pages and add items to your cart. Finally, I tried music and my ears alone. Also when I set 1kHz to max unclipped amplification then check 4kHz and 8Khz the higher frequencies show "sine like" waveforms but the shape is somewhat distorted ... and even when maxed out on the gain the 4-8kHz don't show up as a flat topped wave but rapidly spike the voltage and appear completely garbled.. Is it at 0db or -10db? But the amp definitely performed above its specified rating. When using a multimeter do I need to set the gain with you eq being how I listen to it? The 100 Hz tone alone will do for both subwoofer and full-range speaker amps. Set the bass on the head unit to about -1/2 of its range (-5 for a control that will go ±10). Using test tones and a multimeter to set amp gain will only work if the meter is accurate at the test tone's frequency - that's why I recommend using speakers and your ears. Very helpful, provided useful information, happy with assistance. How can you get 17.2V RMS on 13.5 DC power supply? Are sine wave test tones in the 60-100hz range not appropriate for testing full range speakers using the "test tones by ear" method? Car amplifier audio terms - like watts, volts, and efficiency - are explained. Repeat Step 2, noting the top clean volume settings, using the 100, 400, 800, and 1K Hz tones. As you can see, the output will remain 'clean' at any position on the volume control as long as the bass is set flat (or for negative gain). Then I backed it off until the hum alone remained. Since the opamps that they are using are less than 100% efficient (in their ability to reach rail voltage), the max peak output is more likely to be about 3.5-3.8 volts. All of our representatives are currently chatting with other customers. Donavon, You should set your amp's gain with all EQs and boosts set as you would normally listen to music. This is because most meters are made to measure AC voltage accurately at 50-60 Hz (the common frequency of all power systems around the world). The quick and easy way to set the gain is by ear while playing music. So I switched to a clear-voiced female vocalist singing swing. For a more detailed explanation, see my article about Tuning your subwoofers. Or as a pair, front then rear or all together? The male singer's voice suddenly developed a rasp. Amp - Alpine PDR-V75 (gains set low - no "Bass boost" or HPF applied) i can set the rear gains to about half way on their rotation. I also played a male singer, to see if it would be any different — it wasn’t. Using a standard hand-held multimeter to measure the voltage of a higher-frequency signal results in readings that are much lower and leads to inaccurate power calculations. the resulting in cab sound is so rear heavy i cant help to think i am doing something wrong. Also, I have an EQ on the head unit, do I set this to my preference before I set my gain? For Tech Support, call Play the pink noise and increase the gain on the highs amp just to the point where the amp starts to clip. When using any of the controls in the boost position, the output voltage at that frequency will increase. This would result in a calculated wattage about one-twentieth of the correct output power. When I'm setting the amp gain for my sub's?, what test tone frequency should I use to most easily distinguish clipping and distortion? This limits the theoretical maximum peak output to 5 volts peak†.

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