Has anyone used these "hifi" power supplies or of similar from Aliexpress? I am looking to power a 3 channel amplifier from TinySine. They are rated high from recent purchases, are these reliable power supplies?
Here are links
https://www.aliexpress.com/item/1005001986877034.html?spm=a2g0o.detail.1000023.13.1f5e1f98CEEiaahttps://www.aliexpress.com/item/100....store_pc_groupList.8148356.25.93ff3429jvhYmc
Is the 50W and PFC protection worth the extra $18
Also, is an EMI filter power switch necessary for an HIFI amplifier?
This is the EMI filter power switch
https://www.aliexpress.com/item/328...-1;4.04;-1;-1@salePrice;USD;search-mainSearch
I am in America so 110V input
This is the amp I purchased and will be using
https://www.tinyosshop.com/index.php?route=product/product&path=158&product_id=1092
I plan to do 3-way active monitor. Possibly running each channel at 4 ohm. Maybe running channel 3 at 2 ohm.
Other recommendations on PSU and other modifications are appreciated also.
Here are links
https://www.aliexpress.com/item/1005001986877034.html?spm=a2g0o.detail.1000023.13.1f5e1f98CEEiaahttps://www.aliexpress.com/item/100....store_pc_groupList.8148356.25.93ff3429jvhYmc
Is the 50W and PFC protection worth the extra $18
Also, is an EMI filter power switch necessary for an HIFI amplifier?
This is the EMI filter power switch
https://www.aliexpress.com/item/328...-1;4.04;-1;-1@salePrice;USD;search-mainSearch
I am in America so 110V input
This is the amp I purchased and will be using
https://www.tinyosshop.com/index.php?route=product/product&path=158&product_id=1092
I plan to do 3-way active monitor. Possibly running each channel at 4 ohm. Maybe running channel 3 at 2 ohm.
Other recommendations on PSU and other modifications are appreciated also.
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Um . . PFC isn't protection, it's Power Factor Correction. 😉 That's the difference between what a typical linear supply draws -- large current spikes at the top of each sine excursion -- and an instantaneous current that is approximately proportional to the instantaneous voltage, the way a simple resistor would. Whether you need to care depends on your power quality / problems, and your local codes.
Your proposal is only US$89-worth of experience gained, for 400W of power amp per channel. I wouldn't do it. But you're certainly welcome to -- and report here how it went!
Couple other minor issues:
Cheers
Your proposal is only US$89-worth of experience gained, for 400W of power amp per channel. I wouldn't do it. But you're certainly welcome to -- and report here how it went!
Couple other minor issues:
- This amp is designed for two full-range stereo channels and a sub channel. If you're building one of these combos into each stereo cabinet, you'll have one channel very under-utilized -- the one supplying the high frequencies.
- Both of the supplies you URL'd are single-output; you'll still need another supply for the active crossover, probably ±15V, or some such.
- Any amp that gives a performance table with columns labeled 12V, 24V and 26V, but only fills in the '24V' column, is more than a little suspicious. The table also fails to annotate the relationship between 'gain' and 'input impedance', implying there's a correlation between them and supply voltage -- which of course, there isn't.
Cheers
The amp does 88 watts at 4 ohm for channels 1 & 2, and channel 3 does 98 watts at 4 ohm or 170 watts at 2 ohm; at 1% THD+N. So with a total of 274 or 346 watts continuous at full tilt, I might go with the 350W PSU and report back.
The plan is to run an amp, psu, and dsp in each cabinet. The highs will be channel 1, mids will be channel 2, and the woofer will be channel 3. Using a DSP, I don't think I will be under utilizing a channel. Each channel has it's own input signal coming from the DSP and I should be able to gain match in SigmaStudio. I currently have AC ribbon tweeter thats 6 ohm but I may use it for a different project and might get an SB29RDAC which is 4 ohm. For mids, I have Tang Band W4-1052SD and W3-881SD. I'm still deciding if I want to do MTM or not. I have four of each, MTM with the W4 (series) would be 8 ohm, and with the W3 (parallel), it would be 4 ohm. Lastly, a RS270-4 for the lows.
Looking at the data sheet from Texas Instruments, it appears TinySine just copied and pasted the power ratings table from the data sheet to their website. Interestingly, the data sheet rates its power at 30V but every other vendor selling a TPA3221 posts its power ratings at 24V. I think I am going to try 27V
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The 'underutilizing' has nothing to do with DSP, or anything else, handling signal before the amp. It results from the difference in acoustic efficiency of the relative drivers, and the acoustic power required of typical sound sources. Even if you crossover as low as 300 or 400 Hz, and don't use compression drivers, more amp power will be needed BELOW the crossover frequency than ABOVE.
Cheers
Cheers
Again, nothing to do with active monitors, passive monitors, full range or otherwise. It's a characteristic of all electroacoustic transducers. Reproducing higher frequencies requires less power -- the conversion efficiency is higher.
This is the reason passive crossovers generally attenuate the high frequencies.
This is the reason passive crossovers generally attenuate the high frequencies.
I would imagine channel 3 would draw the most current from the PSU and channels 1&2 draw a lot less. Does it not matter if the psu can supply the voltage and current when bass notes hit?
I don't mean to suggest that it won't work -- most likely it will. But the channel driving the treble section will have 8 to 12 dB of headroom, when the other two channels are clipping. That's a lot of power that you'll have no way to put to use.