#21
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If indeed that is true, this would of course have serious performance implications given the reactive nature of loads inherent in most loudspeakers. Perhaps an excuse for another tour! |
#22
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Don’t need an excuse for another tour!
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Main Equipment: Kharma Elegance dB11-S, JL Audio F113v2 X 2, Block Audio Line & Mono SE Amplification, Bricasti M21 DAC, Antipodes Kala K-50 Server, Clearaudio Performance SE. Satisfy tonearm & Maestro Wood MM cartridge. Power: Shunyata Everest 8000, Sigma XC v2, Sigma NR v2, Block Audio PCs, Defender, ADDPowr Wizard Grounding: Shunyata Altaira CGS - 4 X Alpha CGS cables, Network : Supra Cat 8+, Twin (Nenon) Modified Buffalo GS2016 Switches, Keces P3 LPSU, Cables: Wireworld Platinum 8 USB, Wireworld Platinum Eclipse 8 Speaker cables, 6M & 1M Tubulus Concentus ICs, Other:Two PSI Audio AVAA C20, Multiple GIK products, Stillpoint Apertures, Stillpoint Minis and Ultra SS, Three 20 Amp lines, Furutech GTX - Gold outlets, Adona Rack |
#23
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There is no question that miss matching the impedance will alter the bass. That's why it is important to use the nominal impedance supplied by the manufacturer as a guide. For example if it is 5-8 ohms use the 8 ohm tap. If it is 2-4 ohms use the 4 ohm tap. This is for modern day Mac amps. Older Mac amps were much more current strapped. Modern day Mac amps have plenty of current if you follow my suggestions. Then it is a matter of efficiency. The more inefficient the speaker the more watts you will need to get the best most relaxed sound. I can't speak to tube amps as I haven't owned a Mac tube power amp in many years.
Also, in my opinion Mac has taken a very intelligent approach to the relationships among current, impedance, and watts. The brute force approach would be a D'Agostino approach. His amps have tremendous current capacity at any impedance but produce less watts the higher the impedance. For example one of his rated at 300 watts at 8 ohms will generally produce 1,200 watts a 2 ohms. But at 8 ohms it will produce 300 watts and a little more (dynamic headroom) before it clips. What this means is an amp with a mega power supply capable of producing many hundreds even thousands of watts at low impedances. A modern day Mac amp like a 601 or 1.2KW has plenty of current if you don't miss match the impedance. It is impossible to miss match the impedance with an D'Agostino amp. Mac amps should run very cool even when stressed. If your amp is hot you may have an impedance miss match which I think inadvisable. Last edited by Charles; 03-17-2018 at 11:22 AM. |
#24
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Speaker impedance is not fixed, therefore it is impossible for the impedance to be exactly matched to any single amplifier tap.
The idea is to match impedance the amplifier is most likely to see with a given speaker the majority of the time for a given speaker. This can even vary according to the program material. For example many 8 ohm "nominal" speakers can dip to as little as 4 ohms in the 50 - 60 Hz range. The impedance seen with such a speaker is going to be very different when playing a string quartet as opposed to organ music. Last edited by 62caddy; 03-17-2018 at 02:47 PM. |
#25
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After about a week of experimenting with both the 4ohm and 8ohm taps I find myself liking the 8ohm better with my Martin Logan CLX electrostatics and MC601.
The first month I used the 4ohm exclusively thinking these speakers would be better served that way. No. There's just more air with the 8ohm. Bass was just as good so no issue there. Today I switched back and forth and 'missed' the open ness that the 8ohm brought. So there you have it. |
#26
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#27
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From the ML site...
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#28
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Forget the numbers. It sounds better at one setting than another. It’s the right setting!
__________________
Main Equipment: Kharma Elegance dB11-S, JL Audio F113v2 X 2, Block Audio Line & Mono SE Amplification, Bricasti M21 DAC, Antipodes Kala K-50 Server, Clearaudio Performance SE. Satisfy tonearm & Maestro Wood MM cartridge. Power: Shunyata Everest 8000, Sigma XC v2, Sigma NR v2, Block Audio PCs, Defender, ADDPowr Wizard Grounding: Shunyata Altaira CGS - 4 X Alpha CGS cables, Network : Supra Cat 8+, Twin (Nenon) Modified Buffalo GS2016 Switches, Keces P3 LPSU, Cables: Wireworld Platinum 8 USB, Wireworld Platinum Eclipse 8 Speaker cables, 6M & 1M Tubulus Concentus ICs, Other:Two PSI Audio AVAA C20, Multiple GIK products, Stillpoint Apertures, Stillpoint Minis and Ultra SS, Three 20 Amp lines, Furutech GTX - Gold outlets, Adona Rack |
#29
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I changed to 4 ohms and the sound went from mediocre to fantastic!
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#30
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And that’s why it takes a village!
__________________
Main Equipment: Kharma Elegance dB11-S, JL Audio F113v2 X 2, Block Audio Line & Mono SE Amplification, Bricasti M21 DAC, Antipodes Kala K-50 Server, Clearaudio Performance SE. Satisfy tonearm & Maestro Wood MM cartridge. Power: Shunyata Everest 8000, Sigma XC v2, Sigma NR v2, Block Audio PCs, Defender, ADDPowr Wizard Grounding: Shunyata Altaira CGS - 4 X Alpha CGS cables, Network : Supra Cat 8+, Twin (Nenon) Modified Buffalo GS2016 Switches, Keces P3 LPSU, Cables: Wireworld Platinum 8 USB, Wireworld Platinum Eclipse 8 Speaker cables, 6M & 1M Tubulus Concentus ICs, Other:Two PSI Audio AVAA C20, Multiple GIK products, Stillpoint Apertures, Stillpoint Minis and Ultra SS, Three 20 Amp lines, Furutech GTX - Gold outlets, Adona Rack |
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