If the amp pops on turn on, you probably have the remote turn-on terminal connected to the ignition instead of the power antenna output of the head unit. If you have a pop, you may have the converter improperly installed or have the wrong converter. With the transformers, there is no pop because BOTH inputs of the transformer are driven from 0-6v at the same time. If you use a line converter without the transformers, there will be a significant pop as the outputs switch from 0-6v. A high power line output converter has a transformer for each channel. When you power up the head unit, the outputs swing from ground (0v) to the output bias voltage (~6v). These have a DC bias point of ~1/2 of the B+ voltage. What type of head unit? Does it have any preouts?Ī common head unit uses a bridged pair of amplifiers for each speaker. So your are using the speaker outputs on the head unit? That is your most likely issue the speaker outputs are not synchronized in the same way as the preouts. Difficult to say which.įor starters, are you sure you have the remote leads connected properly?Įdit: Sorry, I just noticed you are using a line level converter. The head unit is too fast, or the amp is too slow. What is happening to you is the amplifier is not fully shut down, or muted, prior to the head unit. When power is cut to the head unit (through the ignition), two things happen: the preouts are powered down, with the subsequent thump, and the remote turn-on lead is taken from 12 to 0V, telling the amp to turn off. The turn off issue, however, is more difficult. There should also be a small delay internal to the amp, that the power up cycle takes a half second or so after the application of 12V to the remote lead. This can be done with a delay on the remote lead, as ppia600 mentions. The head unit is supposed to have its preout signals up and ready prior to the amplifier turning on its outputs. If the amp's remote turn-on lead is properly connected to your head unit's remote turn-on lead, then this is a more difficult issue to address. In my experience, the turn off thump is more prevalent, and difficult to address. If so, the delay device will only work when turning the amp on. You say you get pop both when you turn the ignition on, and when you turn it off? I figure a capacitor in function would seem logical as it would absorb the high pulse of voltage and slowly release it however I do not want to alter the sound (especially not apply a high pass filter on my sub!) If the problem is within the amplifer, is there anything I can put between the amplifier and speaker to stop this? If the problem was from the headunit, I can't just stick a capacitor on there because wouldn't that work as a high pass filter? What can be done if it's due to the head unit?ģ. How can I find out whether it is the head unit or the amplifier discharging an input signal that is causing the pop? I have a multimeter that has a bunch of features I don't know how to use but may be helpful.Ģ. It's hard for me to isolate whether it is the head unit or the amplifier discharging the input signal that is causing the pop.ġ. It does not occur when I turn the amplifier on and off with the RCAs not plugged in. I'm annoyed by it as well as I'm concerned about any damage it is doing. The speaker has a significant throw on it when this occurs. but from my knowledge, there’s no way of preventing that.When the RCAs are hooked in from the line level converter to the amplifier and I turn the ignition on and off, the amplifier sends a loud pop to the speaker. (This same type of popping happens when turning on and off phantom power toward microphones. If your speaker is already on, that’s when you’ll get the loud pop to your speakers (and headphones). Simply turn on your audio interface FIRST, or turn off your audio interface LAST. It sounds so aggressive! But now you know how to fix it. I’d really like to see audio interface companies implement some sort of “soft start” when turning on an audio interface to prevent this loud pop. Preventing Studio Speakers from Popping When Turning On and Off If you follow turning on your speakers/audio equipment this way, you will avoid that horrible pop sound and protect your investment! Conclusion. Now when it comes time to turn everything off, you will want to: Turn on your sub first before your speakers! (If you don’t have a subwoofer skip this step!) Turn your audio interface on first! (If your speakers are on first that’s where you get the pop!)Ģ. Have everything turned off before starting step one.ġ. Here’s a step-by-step list to prevent your speakers popping! How to Prevent Speakers Popping When Turning On and Off Audio Interface:
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