The one where the highest frequency in the input signal can achieve full voltage swing.
Wikipedia: Slew rate
"Slew rate helps us identify the maximum input frequency and amplitude applicable to the amplifier such that the output is not significantly distorted."
Nothing magic about it.
14 V/µs is enough to produce a clean 84 kHz sine wave at the full rated output power without ever hitting the slew-rate limitation. Please provide a scientifically-based explanation of why you need more than this?
Also note that I specify the full-power bandwidth rather than the small-signal bandwidth.
Tom
If there were reliable reviews which said orchestral music sounds great with the LM3886 / LM4780 / Gainclones ... but as much as I searched I have not found!!!
Did you listen orchestral music -reference records- with your amps?
It is the only dude I have with the use of composite amplifiers.
If I had to start an audio system from zero, your parallel design would be chosen. But I would need a much fuller DAC (maybe the new TEAC UD-503 UD-503 | TEAC ) with balanced outputs. The sum of money would be quite high.
Did you listen orchestral music -reference records- with your amps?
It is the only dude I have with the use of composite amplifiers.
If I had to start an audio system from zero, your parallel design would be chosen. But I would need a much fuller DAC (maybe the new TEAC UD-503 UD-503 | TEAC ) with balanced outputs. The sum of money would be quite high.
Yep! That's what I was able to provide without access to my file system at home where I keep the plots...
I think I'll write up a comparison between the two amps (with plots) and post it to my website. I'll let you know when it's live. I have quite a few other projects ahead of it, however. Sorry guys. Activities that are likely to drive business results need to have higher priority.
Tom
well first off define a reliable review. Who would review it? Not some random punter off the internet if you want reliable. Or have you come from one of those forums where everyone is an expert reviewer and the herds follow the latest star review?
Secondly if you read this thread rather than jumping at full ignorance you would notice that you still get high CMRR rejection with a single ended input. 86dB springs to mind without searching. In fact that is a major selling point.
Secondly if you read this thread rather than jumping at full ignorance you would notice that you still get high CMRR rejection with a single ended input. 86dB springs to mind without searching. In fact that is a major selling point.
That's sorta the same question as, "did you listen with my favorite speakers" or "did you use speaker cables carved from a solid block of unubtaniom by Ipswich virgins".
I listen with various kinds of music. Mostly classic rock, such as Pink Floyd, Dire Straits, Mark Knopfler, etc. Celine Dion gets a spin as well. When she really lets out on the album "Falling Into You" most amps buckle, my amps shine. The musical Chess usually gets played as well. The recording is excellent and has high dynamic range. Bach "Toccata & Fuge in D minor (BWV 565)" played by Simon Preston. Bach "Brandenburg Concertos 1-6". Stan Getz, "Cafe Montmartre". Mr. Getz saxophone is excellent at pushing an amp to the limit and the recording is excellent as well. Joe Satriani's albums "Flyng in a Blue Dream" and "Strange Beautiful Music" get a spin also. So I'd say, I push various kinds of music through the system.
Whether any of this qualifies as -reference records- by your definition, I have no knowledge of, but it satisfies my needs.
I will usually try a couple of different speakers. Mark Audio Alpair-6P, Dali 3A, KRK R6, and soon LXmini.
Needless to say, all this is quite a bit of work and takes a while to accomplish. That's another reason I make my design decisions based on measurements. There's plenty of research that shows good measurements (plural, i.e. multiple parameters) correlate with high scores on perceived sound quality in double-blind listening trials. See the work by Floyd Toole, Sean Olive, et al.
Tom
Common practice in the audiophile press is that the reviewers get free gear in exchange for a favorable review. Well... Technically, the gear isn't free, it's just on a "long-term loan" to the reviewer with no expectations of ever being returned. It's also common that major advertising clients will expect more favorable reviews.
How do I know? A friend of mine used to be a reviewer and has the stacks of gear to prove it...
Yep. At frequencies below about 1 kHz you take a 3 dB hit by using single-ended. At frequencies above, the hit is bigger, but you'll always come out ahead compared to the 0 dB CMRR of an ordinary single-ended input.
Tom
Now with Google:
-> https://www.google.com/search?q=lm3886+lm4780+gainclone+classical+orchestral+music
nothing
-> https://www.google.com/search?q=classical+music+reference+records
Only you have written about these musics now.
-> https://www.google.com/search?q=lm3886+lm4780+gainclone+classical+orchestral+music
nothing
-> https://www.google.com/search?q=classical+music+reference+records
Only you have written about these musics now.
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wow people who build a kit have expectations that it will sound good. Who would have thought that. I am flabbergasted.
the GT101 seems to have pretty much spec sheet performance, so around 1000 times worse than the Mod-86. Should sound as good as any other chip amp using the Nat semi data sheet.
If the words of the unwashed are what you want to hear, build that.
the GT101 seems to have pretty much spec sheet performance, so around 1000 times worse than the Mod-86. Should sound as good as any other chip amp using the Nat semi data sheet.
If the words of the unwashed are what you want to hear, build that.
I don't have any comment about the quality or anything else on the Akitika amp since I've never even seen one, but on their web page they claim "It delivers 50 Watts per channel into 8 Ohms, and nearly double that into 4 Ohms." Wait, what? Nearly 100 watts from a single LM3886 chip? I don't think so, I find that claim troubling.
Mike
Mike
I think Akitika GT-101 is the best LM3886 not balanced. If my DC blocker x3 (with BIG EPCOS 18,000 microF and 105 ° C) they would not have given such a fantastic result in reducing the DC and noise / ripple it is that I planned to buy (connected by RCA to the ODAC).
-> GT-101 Measurements
-> GT-101 Measurements
Doesn't seem a significant improvement over the data sheet.
You don't seem to understand what balanced means. Maybe try and understand that first. To repeat. Mod-86 is happy with single ended drive and WILL improve your isolation/fix hum problems/filter RF.
But if you really want to build a GT-101 please go and open a thread on it. PLEASE.
You don't seem to understand what balanced means. Maybe try and understand that first. To repeat. Mod-86 is happy with single ended drive and WILL improve your isolation/fix hum problems/filter RF.
But if you really want to build a GT-101 please go and open a thread on it. PLEASE.
@billshurv
I think you need glasses. Michael Bean said "early 100 watts from a single LM3886 chip? I do not think so, I find That claim troubling."
I do not need an amplifier now.
@Julf
My first Dc blocker was with EPCOS 15,000 microF 85ºC. The second was with WPCOS 18,000 microF 105 ºC and the sound was better.
Then I have a DC blocker x2 in series with EPCOS 18,000 microF 105ºC and sound was better!!!
After I connect the two DC blocker and the sound was much better.
Finally I connect the second DC blocker and a new DC blocker x2 (the first is now with my AV Yamaha RX-V2700 with TV) and the sound was much better!!!
Now my bottleneck is the high voltage of my mains, not the noise or DC.
I think you need glasses. Michael Bean said "early 100 watts from a single LM3886 chip? I do not think so, I find That claim troubling."
I do not need an amplifier now.
@Julf
My first Dc blocker was with EPCOS 15,000 microF 85ºC. The second was with WPCOS 18,000 microF 105 ºC and the sound was better.
Then I have a DC blocker x2 in series with EPCOS 18,000 microF 105ºC and sound was better!!!
After I connect the two DC blocker and the sound was much better.
Finally I connect the second DC blocker and a new DC blocker x2 (the first is now with my AV Yamaha RX-V2700 with TV) and the sound was much better!!!
Now my bottleneck is the high voltage of my mains, not the noise or DC.
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