Yellow basket question
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Joined: Jul 2013
Posts: 57
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From: Cedar Rapids, Iowa
Thanks for the replies guys, I'm in India for work for awhile so I can't test anything at the moment. I set the gain on them with my fluke DMM. I don't think I used a -5db test tone, I think it was a flat 1khz 0db. 3 notches from the top on the head unit. What is strange is that changing the crossover doesn't eliminate the pop till I crank it way up around 250hz, so it's not some super low frequency. I did see in the gzcf review thread that someone else was having what sounds like the exact same issue I am. Same CV b54 amp as well so I'm starting to wonder if the amp is the issue. It is a popping sound, which made me think a physical cone excursion issue, but it's beyond my knowledge for sure. I originally set the speakers to 225w, but dropped down to 200 (24.5v) to see if that fixed the issue It didn't seem to.
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Joined: Sep 2017
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From: Southern Virginia
Two things I have learned relative to this discussion.
One is the best way to actually tell if a signal is distorted (clipping) is with an oscilloscope of some kind. Most any other method is just guesswork. I realize there are magic boxes now that will shine a light when clipping occurs but there really is no better method for analyzing a signal. In my younger days I was an electronics technician. We used volt meters for basic troubleshooting but when the metal met the meat we always used oscilloscopes.
As far as head units go with my stock HK head unit with preamp outputs installed by Iron Cross Audio the waveform of my test tone does not clip even at max volume. This allows me a good bit of headroom for gain overlap.
Another thing that I think most of us realize is as wattage applied to a speaker goes up the crossover must also go up to avoid distortion. These speakers are rating by the manufacturer for 150 watts RMS. If someone is going to apply more wattage than that (especially via a budget amp like the CV) at 80Hz crossover I would think it is highly likely to experience distortion at high volumes.
Just my .02 based on my tinkerings.
One is the best way to actually tell if a signal is distorted (clipping) is with an oscilloscope of some kind. Most any other method is just guesswork. I realize there are magic boxes now that will shine a light when clipping occurs but there really is no better method for analyzing a signal. In my younger days I was an electronics technician. We used volt meters for basic troubleshooting but when the metal met the meat we always used oscilloscopes.
As far as head units go with my stock HK head unit with preamp outputs installed by Iron Cross Audio the waveform of my test tone does not clip even at max volume. This allows me a good bit of headroom for gain overlap.
Another thing that I think most of us realize is as wattage applied to a speaker goes up the crossover must also go up to avoid distortion. These speakers are rating by the manufacturer for 150 watts RMS. If someone is going to apply more wattage than that (especially via a budget amp like the CV) at 80Hz crossover I would think it is highly likely to experience distortion at high volumes.
Just my .02 based on my tinkerings.
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Joined: Jul 2013
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From: Cedar Rapids, Iowa
So you think the issue is distortion, specifically caused by the amp? I figured that amp at only 60% of rated output wouldn't be an issue. It seems like a fair assessment though given the other person with the same issue has the same amp. Wish it wasn't such a huge investment to pick up a soundigital 1200.4 just to test it out lol.
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Joined: Jul 2009
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From: Illinois
So you think the issue is distortion, specifically caused by the amp? I figured that amp at only 60% of rated output wouldn't be an issue. It seems like a fair assessment though given the other person with the same issue has the same amp. Wish it wasn't such a huge investment to pick up a soundigital 1200.4 just to test it out lol.
I could set it to 125 all day. System sounds fine.
But putting a SMD distortion meter on it It shows distortion at 85 watts. So it's imperative to have some way to test distortion. Even if the amp is at 60% of rated power.
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