You will not hear the ultrasonic clipping, because it is...duhh...ultrasonic. I suspect that the problem is a poor ground where your RCA cables connect to the source or amplifier. I understand the basics of 4 ohm v. 8 ohm. A 4-ohm speaker extracts twice as much power than an 8-ohm speaker from an amplifier. I ask as I have a Hegel H90 which is rated at 8 ohms but states 2 ohm minimum load. I recall now that at volume ~75-80/100 I was getting popping sounds too. No RCA plugs. Since the amp is highlighted as an 8 ohm do you think I'd be better served with 8 ohm speakers despite a minimum 2 ohm spec.? Or something like that! Be careful if you try to combine a 4-ohm speaker and 8-ohm speaker to the same amplifier because you could blow … I ask as I have a Hegel H90 which is rated at 8 ohms but states 2 ohm minimum load. I don't want to do this unduly and cost a good store for no reason. This has to do with the inductive reactance nature of loudspeaker systems. One 8-ohm speaker plays loudly with only half the current from the amp, but if two 8-ohm speakers are connected in parallel, the resistance in each speaker falls to 4 ohms to match the amp. It is second to none in sound quality, and has the power to drive ANYTHING with no strain (hundreds of watts). The high damping factor also indicates that the actual output impedance of the amp is less than one ohm, which is exactly what you want. Although a particular loudspeaker may be rated for 4 ohms (nom), it may actually provide a more stable load for an amp to drive than another speaker rated at 8 ohms. Many of the RCA cables have thick heavy leaves on the outer grounding part of the plug connector. A speakers impedance varies as a … Consider getting the Musical Fidelity M6si integrated amplifier. This is a very common problem. Then it might warm up … Most modern amps can be used with speakers that have a total load at or above the minimum impedance rating. This can cause the amplifier to go into oscillation at ultrasonic frequencies, which causes excessive power to be produced at the ultrasonic frequencies, which overheats the amplifier. The impedance of parallel combinations is given by: 1 Z = 1 Z 1 + 1 Z 2 Also, 8-Ohm speakers could be combined in parallel (two per channel) on an amplifier with a 4-ohm output. Eight-ohm speakers can be run with a 4-ohm amp. It is the first thing I look for when I am checking an amp that is overheating. To verify this, you need an oscilloscope, which will show the clipping and distortion at the speaker terminals. Types of Connections: 4 Ohms and 8 Ohms. 4 ohm Speakers with 8 ohm Amp Cause Distortion. I mean even if I swap to 8 ohm speakers down the line have issues from pushing it a few times. For instance, a 4-ohm amplifier can run any total load of 4 ohms or above, including 16-ohm cabinets and speakers. The 4 ohm with draw more amps at volume and have over heat/damage an amp rated for 8 ohms. Also; even IF the speakers were causing it, it would not overheat to the extent you describe.

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