You can use it, you are just tying the negative balanced phase to ground. Depending on how the balanced input topology is setup, it may permit full power output by rebalancing the amp drive based on only the positive input, or it may only allow half the output swing. I suspect it is the former. This same technique can be used on the PA-5 and many other balanced input amps. What you lose is the noise cancellation advantage of balanced lines. For short runs of signal cable though, this doesn’t really matter. Most amps with an LTP input stage often have the negative side tied to ground. The single ended input drives the positive side. That same LTP input can be used for balanced input by driving both sides with balanced preamp inputs. The grounding on the negative side must be removed though.
It's not necessarily money that makes it better, it's engineering. If you want load independence, you'll need to take the feedback behind the LC, not before it as many budget Class D amps do. Post filter feedback is just a much harder problem to solve, and therefore less seen.
480W is only 20dB above 4.8W.
I don't want hearing damage so i don't do that.
I don't. People with less sensitive speakers or larger rooms might.
And realistically in your example because it is active those would seem even more powerful than comparable passive amplification which has to travel through a crossover and experience additional loss. I would guess a lot of the prospective users will be buying this and bi amping which would be sensible. And… I would think in turn extremely satisfied with the sound quality.That's what JBL figured when they tucked 2x250w amps into each of their 7 series monitors.
Even with that, I will still occasionally see the clip light flicker...
It obviously depends on the speaker being driven.
I have taken a couple of screenshots...I don't. People with less sensitive speakers might.
Here's a piece of music. Large parts of the first four minutes are at -30dB. The crescendo sits at around -10dB for long periods. Transient peaks hit about -2dB.
Even listening to the quieter parts at 1/2 a watt, the transient peaks are going to clip on any amp less than around 500W. I accept that might not be an audible problem.
We reckon this is the all-time greatest crescendo in classical music (there will be goosebumps)
Listen to the epic crescendo that bridges the third and fourth movements of Beethoven’s Fifth Symphony. It’s just remarkable.www.classicfm.com
the amplifier clips at high gain with 2.2 volts input so RCA is not a big deal.
What is the cause for the difference between the measured figure and the expected figure (-140dB at 1k)?
There are optimizations which can yield better crosstalk. I am using my standard dummy load which may not allow 140 dB of crosstalk itself. For Benchmark, I had a different load box/wiring. There are also different schemes for measuring crosstalk which yield different results (Left vs Right or the other way around).
Wow.
I have tested some 200 speakers. The *minimum* impedance is what I report and it is almost always in 3.6 to 4.2 ohm range. Dropping to 2 ohm is exceptionally rare. But even if it did, many people power these with amps with minimum spec of 4 ohm and don't report issues.
