TDA7498E vs IRS2092 based amp

[pguerin]

Hello,

I'm looking for four channels of amplification for a MTMWW speaker.

What about those amps based on chips TDA7498E and IRS2092 ?

Which one could be "better" for amping two woofers and two woofer/medium in a serial or // configuration. I'm planning a 2.5 way , wich configuration is recommended, // or serial for connecting the two speakers ?

I've looked at those board and amp :

Sure Electronics' webstore 2 x 125 Watt Class D Audio Amplifier Board - IRS2092

https://www.shenzhenaudio.com/smsl-...-class-t-digital-amplifier-power-adapter.html

Any advice welcome 🙂

Best regards,

Pascal

 

[ICG]

MTMWW, so it's a 3-way, right?

The biggest difference is, the TDA7498E uses a single rail voltage (14-36V), the IRS2092 needs a symmetrical power supply (2 rails, +/- 55V).

The amps are very different from the specifications, the Sure is designed and rated for higher impedances, 8 Ohm and up, the TDA7498E is the opposite, it delivers the maximum power only at 3 Ohm. That is also the downside of the TDA7498E because it cannot deliver max power on both channels at the same time, that's why the PBTL output isn't doubled, instead it's a lot lower (only 220W instead of 340W).

So both don't appear to be ideal for the task. If you want to stay at Sure, this 3x 200 W amplifier board seems to be better suited. I haven't heard that yet but I know the 2x300W t-amp, which sounds very good.

 

[JonSnell Electronic]

The IRS2092 will run happily on any rail voltage, single or dual up to 250volts (125 - 0 - 125v). It does require a 12volt supply, on pin 12, to the lower end, see data sheets.
http://www.infineon.com/dgdl/irs2092.pdf?fileId=5546d462533600a401535675f1be2790
It depends upon the chosen clock frequency as to which is "better" for the chosen purpose, than the other.

 

[ICG]

The IRS2092 will run happily on any rail voltage, single or dual up to 250volts (125 - 0 - 125v). It does require a 12volt supply, on pin 12, to the lower end, see data sheets.
http://www.infineon.com/dgdl/irs2092.pdf?fileId=5546d462533600a401535675f1be2790
It depends upon the chosen clock frequency as to which is "better" for the chosen purpose, than the other.

The IRS2092 itself will - but it will not run on any rail voltage if the peripherals of the board isn't set up for that. And the Sure board isn't.

 

[pguerin]

Hi ICG,

Thank you for your recommendation, I will have a look at the products description.

I think I also must answer if the two woofers will be connected in serial or //.
The original passive crossover used a serial configuration for the two woofers and the two medium speakers.

MTMWW, so it's a 3-way, right?

The original speaker was a 2.5 way maybe I shoud have write MMTMM 😉

 

[ICG]

Well, these are the things which make a question get a meaningful answer.
A 2 1/2 -way speaker can't be replicated active without another output channel and active filtering or keeping passive parts (the coil) in. And for woofers in 2 1/2 ways (don't write 2.5 since that implies stereo sat with 5 subwoofers!), they cannot be serial wired.

For the amp it isn't relevant how much drivers you'll connect, you need to provide the information about the impedance and what frequency range they are working in. If you aren't sure about the setup, name the drivers and numbers of it and crossover frequencies, not WWMMOMGWTF.

 

[pguerin]

Hi ICG,

The speakers are based on the Elsinore setup that I'm planning to replace de HDS tweeter by the SB29 RDC-004 without waveguide.
The four other speakers are HDS 830875. You will find the original passive crossover also in Attachments.
Concerning the crossover frequencies , 1.6 khz for the tweeter SB29 and around 300 hz for the bass section.
I own 50 ASX2 SE amp with custom buffer and a Najda DSP, they are driving my Nomex 164 , this setup is working nicely.
So it's why I need four channels to drive four pairs of 830875, the high section wil be driver by the two channel 50ASX2.

What about this amp :

Sure Electronics' webstore 4 x 100 Watt Class D Audio Amplifier Board - STA508

 

[IVX]

Actually, for the IRS2092 you have an option to run it in the UcD mode, probably it's would be better in terms of SQ vs IR pdf recommended mode. At least old threads of this forum believed for that 😉

 

[ICG]

Hi ICG,

The speakers are based on the Elsinore setup that I'm planning to replace de HDS tweeter by the SB29 RDC-004 without waveguide.
The four other speakers are HDS 830875. You will find the original passive crossover also in Attachments. Concerning the crossover frequencies , 1.6 khz for the tweeter SB29 and around 300 hz for the bass section.

There are several things wrong with this crossover. For the L-R-C filters there's no serial filter element on which the voltage can drop off, so either it only draws more current from the amp (and is pretty much amp dependent in its behaviour) or - and that's what I suspect - the diagram is wrong and the coil L1 comes before the parallel filter. The second thing is, if the crossover is really that low, the tweeter is limiting the dynamics of the speaker. It's the weakest link because if it's crossed over that low, it needs to have a steeper slope, at least 18dB/oct electrical.

With the DSP you cannot easily and cleanly replicate these filters. But these things mean you cannot just enter some values into the dsp, you have to develop a completely new setup and that is not as easy as it might look like. Do you have experience with developing a speaker and access to measurement equipment?

I own 50 ASX2 SE amp with custom buffer and a Najda DSP, they are driving my Nomex 164 , this setup is working nicely.
So it's why I need four channels to drive four pairs of 830875, the high section wil be driver by the two channel 50ASX2.

That amp will work nicely for that.

What about this amp :

Sure Electronics' webstore 4 x 100 Watt Class D Audio Amplifier Board - STA508

The STA boards sound nice but you have to change the setup for that since the AA-AB009 only got 35W<0.01THD+N at 8 Ohm which will will be halved at 16 Ohm. So wire them parallel and you'll get 50W <0.01THD+N per channel. And no, the (higher) 10%THD values for the power aren't comparable, that distortion level is not acceptable at all, noone wants to listen to that. But keep in mind, that goes for ALL amplifiers, not just this one.
If that's enough power for you, that's fine, otherwise I would suggest you go for a higher power amp.

 

[pguerin]

With the DSP you cannot easily and cleanly replicate these filters. But these things mean you cannot just enter some values into the dsp, you have to develop a completely new setup and that is not as easy as it might look like. Do you have experience with developing a speaker and access to measurement equipment?

Hi ICG,

I've got not so much experience in developing speakers, but yes I've access to measurement equipment and I'm able to make accurate measures and simulate with Passive Crossover Designer or Xsim.

First thing for me is to build a more powerfull amp, I will start by buying two Hypex UCD 180 HG modules next month as I can reuse a 2x35 V PSU in a 2U case.

Thanks you for your help and technicals informations.

 

[irribeo]

Hypex is nice but at the moment I would buy 4 additional 50asx2 and set them to btl, much cheaper.

 

[pguerin]

Hypex is nice but at the moment I would buy 4 additional 50asx2 and set them to btl, much cheaper.

Hi irribeo,

I can source the 50 ASX2 BTL for 110 € and I need a input buffer to use them with my Najda DSP. As I've wrote before I own an old amp based on TDA7250 with a 2x35V PSU . Reusing the PSU and the case with two Hypex 180 HG will cost me 180 € for two channels input buffer included.

 

[irribeo]

That 180 € bought you around 9 icepower 50asx2 on ebay at moment of my post. At this moment that offer is not listed on ebay, over 50 modules were sold and I believe over 50 were still available, so could be seller's holiday.

 

[pguerin]

That 180 € bought you around 9 icepower 50asx2 on ebay at moment of my post. At this moment that offer is not listed on ebay, over 50 modules were sold and I believe over 50 were still available, so could be seller's holiday.

20 € per 50 ASX2 module ! that's 1/4 of the regular price 😱