I had a couple of T amps (both went belly up) that I briefly used with my AKG K1000's. They are a unique headphone that is powered by speaker outputs, and present a 120ohm load to the amplifier.
The TA2024 chip in the T amp varied frequency response with load, at least according to the chart in the data sheet.
I've been looking into getting a class D amplifier, but I am concerned that I won't be able to use them with my headphones. (I also use speakers, but I'd like my new amp to work with both).
Do all Class D amplifiers vary frequency response with load? I looked on the data sheets for some of the newer Tripath chips, but they left off the load/frequency response graph that was on the data sheets for earlier chips. This graph showed a vast increase in high frequencies (above 10k) as the load increased.
Nuforce's website has a chart claiming that their amplifier is load invariant but that none of the other manufacturers listed on the chart are load invariant.
I am seriously looking at getting an ICEpower amp, or perhaps building a tripath. Does anyone happen to know if frequency response varies according to load in all of the class D implementations outside of Nuforce?
Thank you for your time-
Aaron.
The TA2024 chip in the T amp varied frequency response with load, at least according to the chart in the data sheet.
I've been looking into getting a class D amplifier, but I am concerned that I won't be able to use them with my headphones. (I also use speakers, but I'd like my new amp to work with both).
Do all Class D amplifiers vary frequency response with load? I looked on the data sheets for some of the newer Tripath chips, but they left off the load/frequency response graph that was on the data sheets for earlier chips. This graph showed a vast increase in high frequencies (above 10k) as the load increased.
Nuforce's website has a chart claiming that their amplifier is load invariant but that none of the other manufacturers listed on the chart are load invariant.
I am seriously looking at getting an ICEpower amp, or perhaps building a tripath. Does anyone happen to know if frequency response varies according to load in all of the class D implementations outside of Nuforce?
Thank you for your time-
Aaron.
UcD from Hypex is also load invariant. and this generally holds true for amps with post-filter feedback.
I'm thinking about the getting an ICEpower based amplifier, do you happen to know if they are load invariant as well?
Thank you for taking the time to respond.
-Aaron.
Thank you for taking the time to respond.
-Aaron.
Since they also use post-filter feedback they are also "load invariant" to a certain degree (look at B&O's datashet). But UcD is better in this respect.
regards
Charles
fokker said:
As phae_accurate pointed out, ICEpower has post filter feedback but is still load variant. "Load variance" depends on forward block gain vs. frequency. Typically gain goes lower with frequency in opamp-based designs, whereas discrete designs have higher gain-bandwidth product, therefore more load independent.
In electronics, everything depends on many factors.
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