Hello all to forum members. My only experience with class D are car audio amps from JL Audio, but I am familiar with messing with amp modules from the pre-class D era
I have a low frequency driver that has dual voice coils, and each coil is rated 200wrms and 4 ohms. The driver is rated 400wrms, so I assume it's 400wrms at 8 ohms in series or 400wrms in 2 ohms in parallel, also rated 800wmax
I am open to increasing driver count to 2 if it makes for a better combination with the amp I end up with. The drivers will be crossed at around 600hz for a specialist build
I always prefer to have ample power headroom, by which I mean that I prefer to utilise an amp larger than the speaker power rating and I also prefer to under use an amp to achieve the power I want rather than run amps at their output limits. I will be using a power supply with ample headroom
I am unable to find any internet published benchmarks that test the better TPA3255 boards with well rated power supplies. Everyone seems to review with PSUs that seem inadequate
Please point me towards any reputable reviews if anyone has crossed paths with one
Maybe TAS or TD series?
At the moment, I am leaning towards two IRS2092 basic boards, one to drive each of the dual coils. I am also looking at the higher rated 1000w mono and stereo channel IRS2092 boards
So in summery;
400wrms plus in 8ohm
or
Two x 200wrms plus in 4ohm
or
400wrms plus in 2 ohms
or
800wrms in 4 ohms for twin driver with driver VC in series and drivers in parallel for total 4ohm load
Looking forward to the forum suggestions. Budget for amp and PSU is around $150AUD
Thanks and regards
Randy
I have a low frequency driver that has dual voice coils, and each coil is rated 200wrms and 4 ohms. The driver is rated 400wrms, so I assume it's 400wrms at 8 ohms in series or 400wrms in 2 ohms in parallel, also rated 800wmax
I am open to increasing driver count to 2 if it makes for a better combination with the amp I end up with. The drivers will be crossed at around 600hz for a specialist build
I always prefer to have ample power headroom, by which I mean that I prefer to utilise an amp larger than the speaker power rating and I also prefer to under use an amp to achieve the power I want rather than run amps at their output limits. I will be using a power supply with ample headroom
I am unable to find any internet published benchmarks that test the better TPA3255 boards with well rated power supplies. Everyone seems to review with PSUs that seem inadequate
Please point me towards any reputable reviews if anyone has crossed paths with one
Maybe TAS or TD series?
At the moment, I am leaning towards two IRS2092 basic boards, one to drive each of the dual coils. I am also looking at the higher rated 1000w mono and stereo channel IRS2092 boards
So in summery;
400wrms plus in 8ohm
or
Two x 200wrms plus in 4ohm
or
400wrms plus in 2 ohms
or
800wrms in 4 ohms for twin driver with driver VC in series and drivers in parallel for total 4ohm load
Looking forward to the forum suggestions. Budget for amp and PSU is around $150AUD
Thanks and regards
Randy
I'm trying to benchmark test a mono TPA3255 with this PSU. I am just waiting for dummy loads to come in the mail. I will update the TPA3255 thread once I get it done.
Hi, how did you go with your tests? I am no closer to deciding on a board
Shortlist 1
Shortlist 2
Shortlist 3
Not sure which would be the better board. All would at face value would be sufficient to run upto 4 drivers in some sort of series parallel combination. Sorry to see that there wasn't any suggestions on what may suit my requirements. Where is everyone?
AIYIMA 500Wx2
Hi all
I decided on this one as I wanted to move my project along. Seems to have ample power for my needs and simplifies the power supply to crazy good levels 🙂
Look how it has twin 24v fan outlets and +15/0/-15 outlet on the board, no mess for any preamp or processing power supply
Would really appreciate some more info on this amp. Is this IRS2092 based?
Hi all
I decided on this one as I wanted to move my project along. Seems to have ample power for my needs and simplifies the power supply to crazy good levels 🙂
Look how it has twin 24v fan outlets and +15/0/-15 outlet on the board, no mess for any preamp or processing power supply
Would really appreciate some more info on this amp. Is this IRS2092 based?
I need to get everything in the box and properly connected/grounded. I had the load resistors alligator clipped with the amplifier and wasn't getting the best signal. I was about to see about 175 clean watts @ 4 ohm. I think I can get more clean power and get closer to the rater 310 watts @ 4 ohm once cables are properly connected. I will update once I get that done. I just started a bathroom renovation so we'll see how fast I can get this done.
Thank you for sharing that. What voltage power supply are you using? How many amps capable?
I'm using this power supply at 48V. I'm assuming 16 amp capable. If I measure with -5 or -10 DB test tone, I probably could get more clean power out of it.
How would one measure the amperage output of a power supply?
The photograph tells me it will be based on IRS2902, because a row of transistors can be seen on the secondary side mounted on a heatsink. Furthermore the primary power mosfets are monted onto that common heatsink - a nogo from basic safety standards. these guys have to do their homework first before flooding the market with dangerous stuff
I meant the specs, would carry a current rating or power rating
Thanks for sharing your results. I am now searching for a solid mono 100w into 4 ohms board. Or a stereo board that can be bridged into mono. Ali has a sale on, and single output power supplies are more than half price. I want to take advantage of that. I have ordered 5 irs2092 boards but the smallest dual supply I can find is 500w, and I want to find a 100-150w supply as all I am aiming for is a clean 100wrms. The speaker is rated 90wrms 4 ohms. I'll still use the irs boards but will run the speaker set with a 600w dual supply in an external box. Will use one supply box for FL,FR,SUB and one supply box for RL,RR,C. Regardless of that, I still wish for that 100w mono option with a more economical psu option e.g. single output supply
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I am concerned. I thot that the transistors being isolated with insulation pads from the sink would be sufficient
This may be a bit of uneducated silliness on my part, could it be as easy as taking off the sink and cutting it in two or three? I can cut pretty easy. Thank you for pointing this out. I, too, would like to not have unsafe things
I want to point out the good things that no one has picked up on!
Compared to other class d amps, this seems to be wearing a lot of sink. The placement of the sink is very intelligent, a thorough enclosure fanned air tunnel can be created with this type of heat sink shape and location. It also very smartly makes available the opportunity to mount the sink outside the enclosure, making it highly suitable for active speaker use, opposed to other IRS2092 designs. I'll take the sink of mine when it arrives and cut it up into sections and join them back up using insulating material, into a continuous length
Next, sink is mounted well away from other components like the caps, as are the inductors
Also, the board is well spaced out. There is plenty of space around the larger caps and inductors to allow for easier upgrades. The smd components are placed well away from the large parts and from each other, the solder points on this board are highly accessible, this is very intelligent. The PCB tracks are neat and easy to follow on either side of the board
All the terminals are aligned along one edge and grouped well apart. They allow cable ends terminated with rings and heat shrink
To my uneducated eyes, this board looks like an upgrader's dream. Your remark about dangerous goods rubs my intelligence the wrong way. I have spent considerable effort and time in trying to pick a good board with ample power at good value, design and layout. One that simplifies the power up process, too. By your remark, I would be the idiot buying these dangerous goods, and I would like you to consider that. You are obviously very knowledgeable about these things though, and I would like to thank you for your observation of the unsafe bit and also for taking the time to answer my query. Would you be able to also help with anything else I may be able to tune on this board
Thanks and regards
Randy
Compared to other class d amps, this seems to be wearing a lot of sink. The placement of the sink is very intelligent, a thorough enclosure fanned air tunnel can be created with this type of heat sink shape and location. It also very smartly makes available the opportunity to mount the sink outside the enclosure, making it highly suitable for active speaker use, opposed to other IRS2092 designs. I'll take the sink of mine when it arrives and cut it up into sections and join them back up using insulating material, into a continuous length
Next, sink is mounted well away from other components like the caps, as are the inductors
Also, the board is well spaced out. There is plenty of space around the larger caps and inductors to allow for easier upgrades. The smd components are placed well away from the large parts and from each other, the solder points on this board are highly accessible, this is very intelligent. The PCB tracks are neat and easy to follow on either side of the board
All the terminals are aligned along one edge and grouped well apart. They allow cable ends terminated with rings and heat shrink
To my uneducated eyes, this board looks like an upgrader's dream. Your remark about dangerous goods rubs my intelligence the wrong way. I have spent considerable effort and time in trying to pick a good board with ample power at good value, design and layout. One that simplifies the power up process, too. By your remark, I would be the idiot buying these dangerous goods, and I would like you to consider that. You are obviously very knowledgeable about these things though, and I would like to thank you for your observation of the unsafe bit and also for taking the time to answer my query. Would you be able to also help with anything else I may be able to tune on this board
Thanks and regards
Randy
Randy Bassinga said:
My guess would be that, most of the folks with the knowledge and expertise you seek have either been someone, or known someone, that at one time or another, did what you're doing -- scrutinizing marketing hype and making a best guess which components are suitable to combine. And no amount of careful study and analysis will yield the answer. To make matters worse, you're shopping at the most over-hyped, least-technically-savvy site the world has yet seen -- Ebay!
The only advice I can offer is, 'Don't expect the first attempt to satisfy all objectives'. And it doesn't really matter whether you spend 5 hours or 50 hours studying and analyzing, there will be some difference in supplier testing methodology, a faulty assumption in the criteria, or outright lie in the sales literature, will throw a wrench in the project.
Buy something, build it up, test the heck out of it, enjoy it the best you can, then make plans to improve the next iteration. That's the best you can do. 😉
Cheers
Rick, thank you, that's the best advice and wake-up call I have received. You are absolutely right and after reading what you wrote I took a step back and did some notes on the results I want to achieve
Anyway, my process so far has been a jumble of ideas and thots. I am clearer now on the results that I am after and the approach to take. Let's scrap all the above, I'll try to organise my approach again
Thanks to all for contributing, and I hope I can look towards you folks for future interaction
Randy