I have the measurements saved, but I'm not familiar with extracting the wav files. Are there instructions for this? If so I can definitely do it, just not familiar with that aspect of REW.If not, you can surely extract them somehow as long as you still have the data saved.
Power into a short? But where do we stop at the other end? Power into not a circuit?It is only a problem if the new data discovers something that cannot be measured and predicted with old data under reasonable use cases.
If it is clipping, then the data is available as "max power into xxx low impedance load". We have 4 ohm, sure 2 ohm data would be nice, but what about 1 ohm then? Where do we draw the line?
And then any complex load behavior would be the sum/combination of the individual behaviors. Unless, again, if data of complex load reveals an emergent property. But with current information, it isn't.
Hmm, it seems that is not so easy… can REW view the raw waveform?I have the measurements saved, but I'm not familiar with extracting the wav files. Are there instructions for this? If so I can definitely do it, just not familiar with that aspect of REW.
Thanks for joining! Amir also tested other frequencies into 4 ohms by the way. Someone already remarked it could be due to a gain difference between the amplifiers. A low voltage level input signal will then never be amplified beyond a certain output voltage, i.e. the output voltage would be gain limited. So maybe the voltage level of your white noise signal was too low for the Fosi to crank it up beyond 80 dB, and the voltage level of the music track was higher? What was your white noise source, and the SACD's level settings for the channel(s) you used?Let me add that the ONLY reason this became an issue, which I detail in the video, was I was trying to do a simple level match of the FOSI v3 with a Yamaha amp. The fact that it couldn't break 80 dB was nothing short of astonishing to me since Amir tested this at 88 watts with the 5 amp 48v ps. But that's just at 1 khz. That's when I got out the old Yamaha receiver rated at 50 watts and it blasted past 80 to 93 dB (nothing was changed except the rca cable were swapped - no mic changes, nothing).
Using music, I could definitely get the meter to go well over 100 dB, but music isn't white noise, so in the real world it may not matter to you.
Current is the limiting factor. If my math is right 114 watts @ 4 ohms is 23.7 volts. If the load is 4 ohms, current would be 6 amps. At 2 ohms it would require 12 amps.@voodooless, Sorry to go back on the previous question, but I would like to understand better.
Earlier, you informed me about the importance of impedance: in essence, the lower it is, the more the amplifier potentially struggles.
However, the V3 can deliver 89W @8ohms before clipping, while it can deliver 141W @4ohms. So, the trend seems to be that the lower the impedance, the more power can be sent before clipping.
Is it possible that in reality, things aren't linear like that? For example, while 4ohms might be easier to drive than 8ohms, is 2ohms more challenging than 4 ?
Thank you!Current is the limiting factor. If my math is right 114 watts @ 4 ohms is 23.7 volts. If the load is 4 ohms, current would be 6 amps. At 2 ohms it would require 12 amps.
You don't have to extrack anything,just find the measurement (.mdat file) in the file that REW saves them,zip it and upload it here.I have the measurements saved, but I'm not familiar with extracting the wav files. Are there instructions for this? If so I can definitely do it, just not familiar with that aspect of REW.
Those are amateur levels, let me introduce the Apogee Scintilla. That speaker had a 1 Ohm version. Very few amplifiers could drive them, most would just simply melt.It could, though. Just Ls, Cs, and Rs (and a calculator).
There's a reasonableness clause to be applied to loudspeaker models, don't you think?
In 2023, would it be reasonable to test amplifier performance into, e.g., a simulated (or real) Infinity IRS Beta or a Quad "ESL-57"?
Sidebar 3: Measurements (from June 1989, Vol.12 No.6)www.stereophile.com
The "ESL-57" is, in essence, a large and peculiarly designed capacitor -- albeit a fine-sounding one.
Both of the above were/are renowned amplifier killers in their time.
Just one anecdote that happened to be easy to find.
I sold a Carver TFM-55x to a guy on another forum who tried to use it to power a pair of unrestored QUAD ESL-57 speakers. Amp quit rather quickly. Preliminary testing shows blown outputs, resistors and diodes across both amp sections as well as a blown 12A slo-blo fuse. Any idea what happened...audiokarma.org
I did forget that one, yes.Those are amateur levels, let me introduce the Apogee Scintilla. That speaker had a 1 Ohm version. Very few amplifiers could drive them, most would just simply melt.
I also find most videos (there are exceptions) to be an inefficient source of information but there are means by which the task can be optimized somewhat. Here's a little diagram. It isn't particularly obvious but it works reasonably well.I should just stay out of any discussion based on videos.