Amp in protect mode?
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Grand HDF Member
Joined: Nov 2012
Posts: 3,784
Likes: 100
From: Pasadena TX
Amp in protect mode?
I'm running the PA RZ4 2000D, and I'm chasing an unknown problem. What are the symptoms of an amp in protect mode audio wise? Is it just silent? I developed what I can best describe as a chatter, sounds like it's turning off and on very fast several times a second. I originally thought it was a bluetooth connection problem with my former Sony DSX310. There is a reset button on those and after I reset it audio would come back breifly, then the chatter returned. Swapped that head unit out for a Sony MEX and all was well for several weeks but my problem returned. The RZ is 2 or 4 ohm compatable, but I'm running 2 ohm Kappas in the lowers and 4 ohm Pioneers in the lids in parallel on the rear channel (3 ohms?). I don't know if the amp is bad or if I need to replace the 2 ohm speakers with 4 ohm ones. I ran it like that for several months with the old DSX hu without an issue, and like I said it was ok for a short while with the new head unit. Thoughts?
Road Captain
Joined: May 2014
Posts: 682
Likes: 197
From: Raleigh, NC
Amp in protect mode?
Read my statement again.
If you have more than one two-ohm speaker, you are already under two-ohms, and your power amp is working too hard.
2ohms(2)=1ohm
4ohms(2)=2ohms
GM
If you have more than one two-ohm speaker, you are already under two-ohms, and your power amp is working too hard.
2ohms(2)=1ohm
4ohms(2)=2ohms
GM
Last edited by GroovusMagnus; Jun 23, 2015 at 11:16 PM.
Road Captain
Joined: May 2014
Posts: 682
Likes: 197
From: Raleigh, NC
Amp in protect mode?
You asked why your amp is acting weird, then described a situation that would result in too low an impedance, forcing your amp to work too hard and overheat.
I answered. Your impedance is too low.
If you can't wrap your mind around that, I guess I'm done here.
GM
I answered. Your impedance is too low.
If you can't wrap your mind around that, I guess I'm done here.
GM
Last edited by GroovusMagnus; Jun 23, 2015 at 11:44 PM.
Elite HDF Member
Joined: Aug 2008
Posts: 4,150
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From: S. FL
John a 2 ohm speaker wired in parallel with a 4 ohm speaker = 1.3 load.
If an amp is in protect mode the on light should go red and it essentially shuts off. If u are getting distorted sound something may be cooked for prolonged use at 1.3 ohms.
If an amp is in protect mode the on light should go red and it essentially shuts off. If u are getting distorted sound something may be cooked for prolonged use at 1.3 ohms.
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Ultimate HDF Member
Joined: Oct 2012
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From: Indianapolis IN.
I guess I'm missing something or I'm getting old. He can run the 2 ohm infinity's on the front channel alone. and run the 4 ohm pioneers in parallel on the back channel with out a problem with the RZ4.2000D. Now as GM said he can't run the 2 ohm speakers in parallel with the 4 ohm speakers on the same channel. Now what he can do is get a set of 4 ohm titan II speakers to run in his lowers. Running the 7.1's and the titan II's in parallel would not be a problem.
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Grand HDF Member
Joined: Nov 2012
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From: Pasadena TX
I have a total of 6 speakers Gannicus, with the aforementioned 2 and 4 ohm on the rear channel and BT 7.1's up front. Looks like I'll have to replace the Kappas with a set of 4 ohm 6.5's. Too bad, I like them. I see some Titans in my near future, and a chance to try the new PA 3000D. Groovus I appreciate your input. I was thinking if 4+4=2 in parallel, 4+2=3 ohm. I'm unaware of the mathematical formula used to calculate that load. As it stands now it's a moot point for the short term as I'm recovering from shoulder surgery and can't ride anyway.
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Grand HDF Member
Joined: Nov 2012
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From: Pasadena TX
So haze, what formula did you use to calculate total load?