In my mind i have a setup with two subwoofers. in my case i still have four dayton audio RS225-8 laying around.
And I want to drive them with an amp, integrated in the case.
After that a D'Appolito MTM setup on top of the bass tower speaker. With two mono-amps, but the question is class d or class AB?
Question 1: Do you think a Class D amp has any disadvantage for such a setup?
(Like a Fosi audio or Aiyama class D amp pcb integrated on the back of the speaker box)
My thoughts: maybe these class-D amps have disadvantages when it comes to high frequencies regarding distortion, damping factor etc. but for signals up to 200Hz, they should be fine. Your thoughts???
Question 2: More or less the oposite of question 1: Does a Chip-Amp (like the LM3886) do a better job for driving the mids and a separate Chip-Amp for the tweeter compared to a class D amp?
My thoughts: These higher audio frequencies are coming closer to the switching frequencies of the class D amp (like a TPA3255) and thus maybe lack clarity or contain more switching noise if compared to a class A/B amp.
Your thoughts? Do you know of any interesting comparisons, maybe measurments, maybe experience, maybe just thoughts on the theory?
Thanks for your input and maybe i could tickle your brain or interest with that question.
Stefan (Funkmaster WhyLee).
And I want to drive them with an amp, integrated in the case.
After that a D'Appolito MTM setup on top of the bass tower speaker. With two mono-amps, but the question is class d or class AB?
Question 1: Do you think a Class D amp has any disadvantage for such a setup?
(Like a Fosi audio or Aiyama class D amp pcb integrated on the back of the speaker box)
My thoughts: maybe these class-D amps have disadvantages when it comes to high frequencies regarding distortion, damping factor etc. but for signals up to 200Hz, they should be fine. Your thoughts???
Question 2: More or less the oposite of question 1: Does a Chip-Amp (like the LM3886) do a better job for driving the mids and a separate Chip-Amp for the tweeter compared to a class D amp?
My thoughts: These higher audio frequencies are coming closer to the switching frequencies of the class D amp (like a TPA3255) and thus maybe lack clarity or contain more switching noise if compared to a class A/B amp.
Your thoughts? Do you know of any interesting comparisons, maybe measurments, maybe experience, maybe just thoughts on the theory?
Thanks for your input and maybe i could tickle your brain or interest with that question.
Stefan (Funkmaster WhyLee).
The last 5 years, the best class D amplifiers outperform analog chipamps like lm3886 and TDA 7293. Even at higher frequencies.
Linn products, famous for using innovative techniques has swapped tda7293 for the better sounding class D tpa3255 in the Selekt dsm series.
The best you can do is to compare for yourself . I did it, and I sold all my class A/B amplifers.
15 years ago , the best class D couldnt be used for high fidelity above 6 kHz.
Nowadays , the best hypex amplifiers has lower distortion at 19/20 kHz intermodulation measurements than the best class A amplifier .
If I were you, I would use class D in every register.
This class D Apollo NCx500ST (Hypex) amplifier outperforms almost all amplifers regardless of price.
https://www.audiosciencereview.com/...ollon-ncx500st-stereo-amplifier-review.47701/
Edit: you dont need expensive class D.
In my experience, a good implemented tpa3255 outperform the best lm3886 or TDA 7293 also at higher frequencies ( 5000 - 20000 Hz.)
Last edited:
Modern Class D amps are much different and perform as well or better than any Class A/B amplifier. I use Class D for everything now. Purifi or Hypex. They are much more affordable and I prefer to put more of my budget towards better quality speakers, DSP and/or room treatment.
I have a TPA3255 board that I am going to test against my mosfet amp tube preamp combo. I built a D smp a decade ago that hit 2mhz switching frequency.
Sounded great but caused hiss on FM and the overload capability was 12A with instant death if that was exceeded.
The 3255 appears to be excellent running on a cheap 48v power supply.
TDA7293 Properly optimized is very difficult to beat.
Sounded great but caused hiss on FM and the overload capability was 12A with instant death if that was exceeded.
The 3255 appears to be excellent running on a cheap 48v power supply.
TDA7293 Properly optimized is very difficult to beat.
Seems like you have to own a composite amplifier then - don’t wanna be rude , but were are the measurements showing any superiority of a composite implementation ?
Measurement wise, the raw TDA7293 is very mediocre .
An example here , with good sounding colorations :
https://www.audiosciencereview.com/...linn-av5125-5-channel-amplifier-review.13902/
Last edited:
You may be right , would love to be proven wrong . Can you show me a link of ANY measurements of this composite amplifier that you’re talking about that beats a pffb tpa3255 ?
Below a good example of modern tpa3255 implementation :
https://www.audiosciencereview.com/...dio-tpa3255-260-2-29a-amplifier-review.50208/
Last edited:
Here some report on the sound of a very affordable chip (cs8673) found in amps like Whuzi Audio Zk Mt21
The really good class D amps are all understandably coy about how they do it. My best guess is they're adding an op-amp gain stage, compensating the heck out of it (including putting the filter chokes inside the feedback loop) and closing the loop.This class D Apollo NCx500ST (Hypex) amplifier outperforms almost all amplifers regardless of price.
https://www.audiosciencereview.com/...ollon-ncx500st-stereo-amplifier-review.47701/
Apart from that, these ultra-impressive noise floors seem too good to be true. 32 ultra-clean and uniquely adjustable signal generators in parallel sounds expensive. Or are they just using major 3rd intervals; each tone approx. 2^(4/12) times higher than the one below it? Irrational frequency ratios would be more revealing and useful, as it would make the signal properties non-repetitive.
First, look at technical specification of your speakers to determine your crossover points.
Second, adjust your active crossover to the selected values.
Third, according to your power demands select any type of amplifier with THD+N below 0.01%.
Solution to your problem has nothing to do with the type of amplifier. All good power amplifiers sound the same with the same speakers. Provided that distortion of the amplifier is low enough, you hear just distortion of your speakers.
My 2 Groschen
Last edited:
They all kinda sound the same. In early MI ( Musical Instrument) The early power supplies sucked and the amp sucked for Class D and switch mode.
Car amplifiers same thing. Lots of shut downs most annoying things invented. Including MTM
Sorry.
2 woofers with one .5 crossed for baffle step is a very nice 2 way. Center to Center with MTM is udder pointless.
Class AB amps are more fun to build. Like plug and play. No computers No processors Passive crossover.
You know, stuff that is actually fun to build.
Car amplifiers same thing. Lots of shut downs most annoying things invented. Including MTM
Sorry.
2 woofers with one .5 crossed for baffle step is a very nice 2 way. Center to Center with MTM is udder pointless.
Class AB amps are more fun to build. Like plug and play. No computers No processors Passive crossover.
You know, stuff that is actually fun to build.