3e Audio TPA3251 TPA3255 Finished Amplifier with PFFB is coming!

[V.b.]

The graph is for comparisons only, absolute performance will depend on implementation.

I am sure 3251 will hold its own on 8Ohms, but will have the same power as 3255 at 36v, around 50w and at that point, if your speakers present a real 8Ohms load, you are much better off with a single 3255 chip at 48v.

But those speakers are rare these days.

 

[SMen]

The graph is for comparisons only, absolute performance will depend on implementation.

I am sure 3251 will hold its own on 8Ohms, but will have the same power as 3255 at 36v, around 50w and at that point, if your speakers present a real 8Ohms load, you are much better off with a single 3255 chip at 48v.

But those speakers are rare these days.

Interesting. I'm using a pair of Triangle Titus which are indeed quite old and rated at 8Ohms and very efficient (90+db). No crossover to the bass/mid (I think) so directly coupled with crossover to tweeter.

 

[harkpabst]

I'm really looking forward to this project. Doesn't the TPA3251 have a higher switching frequency than the 3255?

DIY kits are just not for everyone, possibly for different reasons.

 

[3eaudio]

I'm really looking forward to this project. Doesn't the TPA3251 have a higher switching frequency than the 3255?

DIY kits are just not for everyone, possibly for different reasons.

frequency is the same and settable from 450KHz-500KHz-600KHz

 

[daniboun]

OPA1656 in plan,maybe consider also provide NE5532P option like other brand did as it is much common and reduce few dollar that some people may care?
any suggestion?

Provide it as an option for instance )

 

[Corvuscorone]

I hope it has sub out.

 

[harkpabst]

I hope it has sub out.

I hope it hasn't. Sub out simply does not belong into the power amp.

 

[Corvuscorone]

I hope it hasn't. Sub out simply does not belong into the power amp.

Why? My O-Noorus D1 works fine with the sub output. It has an 80Hz cutoff for the sub. If there was still one that could be adjusted. Some preamps and all dacs do not have a sub output.

 

[GoDawgs]

Why? My O-Noorus D1 works fine with the sub output. It has an 80Hz cutoff for the sub. If there was still one that could be adjusted. Some preamps and all dacs do not have a sub output.

Why add the extra cost for a non amplified output? Please don't heap another component price increase on me when I have a preamp that does what I want.

There is a market for these small efficient components that do one thing, if they do it well.

There is also a market for the "one size fits all" crowd to buy a Bluetooth, optical, e-arc, HDMI, rca, xlr, clothes pin and other inputs and outputs amp. I do not want to buy a sub output with my Amp because another persons preamp doesn't have what they need.

 

[harkpabst]

Why? My O-Noorus D1 works fine with the sub output. It has an 80Hz cutoff for the sub. If there was still one that could be adjusted. Some preamps and all dacs do not have a sub output.

@GoDawgs nailed it. A low cost (but hopefully good price performance ratio) power amp should concentrate on just that.

A fixed 80 Hz low pass would be totally useless. 80 Hz isn't magically always right for sub integration. It's just (almost) by chance a well known number because of the Low Frequency Effects channel. Even an adjustable low pass is still useless because sub integration really needs high pass filtering of the mains.

If you really are into integrating a sub (or more) you are better off with a pre-amp or an all-in-one streamer/DAC/pre-amp (like the coming WiiM Ultra) that does support proper subwoofer management. Just let the power amp be the best it can for as little money as possible. No volume control, no time controls, no sub out, no VU meters, no headphone out, no nothing.

Just my $0,02, of course.

 

[Corvuscorone]

@GoDawgs nailed it. A low cost (but hopefully good price performance ratio) power amp should concentrate on just that.

A fixed 80 Hz low pass would be totally useless. 80 Hz isn't magically always right for sub integration. It's just (almost) by chance a well known number because of the Low Frequency Effects channel. Even an adjustable low pass is still useless because sub integration really needs high pass filtering of the mains.

If you really are into integrating a sub (or more) you are better off with a pre-amp or an all-in-one streamer/DAC/pre-amp (like the coming WiiM Ultra) that does support proper subwoofer management. Just let the power amp be the best it can for as little money as possible. No volume control, no time controls, no sub out, no VU meters, no headphone out, no nothing.

Just my $0,02, of course.

Almost all amplified subs have low pass filtering about 30 Hz to 150 Hz. In my opinion, high pass filtering is not necessary for floor standers that reproduce below 40 Hz. Just add a subwoofer and set the cutoff to 30-40 Hz. When playing music, almost the entire frequency range is played by the floor standers, and in the home theater the lowest rumbles come from the sub. High pass filtering seems to be a very rare feature. What is the advantage of high pass filtering if the main speakers can reproduce very low frequencies? Is the bass produced by the Sub better than the big floor standers that play down? At least I use my sub with a cutoff frequency of 35 Hz and let my sub play only very low frequencies.

 

[Guddu]

What is the advantage of high pass filtering if the main speakers can reproduce very low frequencies? Is the bass produced by the Sub better than the big floor standers that play down? At least I use my sub with a cutoff frequency of 35 Hz and let my sub play only very low frequencies.

Not to advocate high pass filter for this specific product, but…..

Not all speakers can do what your speaker could.
A better integration requires high pass filter, take example of AVRs how they crossover based on speakers capabilities.
Most of the speakers which can play low suffer with higher distortion and a high pass filter could help is using it in a better way.

 

[Corvuscorone]

Not to advocate high pass filter for this specific product, but…..

Not all speakers can do what your speaker could.
A better integration requires high pass filter, take example of AVRs how they crossover based on speakers capabilities.
Most of the speakers which can play low suffer with higher distortion and a high pass filter could help is using it in a better way.

That's certainly true. Bookshelf speakers cannot produce low bass with sufficient pressure without distortion. Why are high pass filters so rare outside of home theater amplifiers?

 

[Guddu]

That's certainly true. Bookshelf speakers cannot produce low bass with sufficient pressure without distortion. Why are high pass filters so rare outside of home theater amplifiers?

The amplifiers we are looking at are basic power amplifiers, more like modules.
And now we want them to develop it into feature rich integrated amplifiers.
Many higher priced integrated amplifiers have all these features.

 

[SMen]

The amplifiers we are looking at are basic power amplifiers, more like modules.
And now we want them to develop it into feature rich integrated amplifiers.
Many higher priced integrated amplifiers have all these features.

I agree.
The original concept with balanced and unbalanced inputs + PFFB in compact cases with good heat dissipation. @3eaudio could even lose the volume control imo. Just have a nice on off switch (if it was a volume control). Maybe a gain switch option.
Then everyone who wants pre-amp features can look at pre-amps.

 

[activewire]

I agree.
The original concept with balanced and unbalanced inputs + PFFB in compact cases with good heat dissipation. @3eaudio could even lose the volume control imo. Just have a nice on off switch (if it was a volume control). Maybe a gain switch option.
Then everyone who wants pre-amp features can look at pre-amps.

Agree the volume control is something I do NOT want on a power amp! Also agree discrete gain switches are better than a volume pot. Fortunately 3e has stated the volume pot can be defeated / bypassed.

 

[harkpabst]

Why are high pass filters so rare outside of home theater amplifiers?

They are slowly becoming more popular because technically it is the superior concept. Look at higher end stuff like Lyngdorf. And just recently for little money the WiiM Amp.

This is not the right place for discussing the details of subwoofer integration but let me point out two thoughts: 1. The ideal spots for subs in the room are usual not identical with the ideal positions for main speakers. 2. To make most out of subwoofer placement some PEQ is usually required which should not be a feature of a power amp, but the sub itself or - even better - of the digital pre-processor.

 

[harkpabst]

PS:
This would be a perfect example of a product I do NOT want to see from 3e Audio.

Another TPA3255 Amplifier is Coming? Douk Audio A100 Mono/Stereo Amplifier!

Hello all members! I’m excited to share another new product designed by Douk Audio with you here, the A100 TPA3255 digital amplifier, which will be released in May or June. The A100 supports mono/stereo and sub/flat mode switching, and comes equipped with a super bass knob. It can perfectly...

www.audiosciencereview.com

 

[amarsicola]

I see a pair of Fosi Audio V3 mono with PFFB costs around 300€ (vat included) in Europe. Can we expect a similar price? Are there any noticeable technical differences between Fosi and 3e implementation? Any particular solution to improve heat dissipation?

 

[SMen]

I see a pair of Fosi Audio V3 mono with PFFB costs around 300€ (vat included) in Europe. Can we expect a similar price? Are there any noticeable technical differences between Fosi and 3e implementation? Any particular solution to improve heat dissipation?

This genuinely would be very expensive. No power supply, one board not two ... and plenty of competition. I'd say timing was important in terms of getting this to market. The monos on kickstarter were closer to 210€ with import vat covered. Fosi and Aiyima I am sure will be onto this type of unit also.