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Old 21st March 2014, 05:58 PM   #1
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Default Soft start, speaker protection: Do I need them?

Hello audio enthusiasts!

I'm an absolute biginner in audio DIY and I'm trying to build a 4 channel amplifier for my speakers. My amplifier is a Sure tk2050 4x100w and I have a Meanwell clone s350-24 power supply provided by Sure. Since, I don't want to risk hurting my speakers should I buy a speaker protection board? If I understand correctly then I have to buy a second power supply to run it... Also, do I need a soft start with my power supply or not?

Edit: Correct me if I'm wrong, but in most tk2050 builds there is no speaker protection. Is there a risk? I know I'm asking something really fundamental, but I really need some help!

Last edited by itopalid; 22nd March 2014 at 03:40 PM.
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Old 22nd March 2014, 07:38 PM   #2
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Sorry to hijack your thread...

I'm panning to buy a TK2050, but the 2X50W version... How do you like that board?
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Old 22nd March 2014, 08:23 PM   #3
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You don't need a soft start with switch mode supplies?

You will have to look at the TK2050 datasheet to find if they implement any dc protection circuit inside the chip.

Sure amps have a bad reputation concerning their quality. I would not use them without speaker protection.
In the other hand hifimediy amps (TK2050 as well) have a lot of positive feedback.
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Old 22nd March 2014, 08:32 PM   #4
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Taken from the TK2050 Datasheet:

"The TK2050 is protected against over-current, over / under-voltage and over-temperature conditions."
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Old 22nd March 2014, 10:23 PM   #5
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Assuming of Course.. that it is a Genuine Chip and not a Clone, like those Mundorfs and Alps pots :-)
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Old 23rd March 2014, 12:36 AM   #6
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Quote:
Originally Posted by zakman35 View Post
You don't need a soft start with switch mode supplies?
.
Usually you don't need soft start with SMPS.
They have soft start built in.

I have always used speaker protection but my gear is used for a disco where the wires are getting tripped over and pulled out.

At home I don't bother as the wires aren't touched.
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Old 23rd March 2014, 02:08 PM   #7
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Quote:
Originally Posted by eisp4nzer View Post
Sorry to hijack your thread...

I'm panning to buy a TK2050, but the 2X50W version... How do you like that board?
Mine is 4x100w so maybe they are different. Anyway, I haven't tested it fully (only with some small, old speakers), but I can say that the amp is silent and there is no hiss on standby. I can't say much about the sound quality.

Champs thank you for your answers. If I understand correctly in case of power supply damage the amp should protect my speakers even without speaker protection, right?
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Old 28th March 2014, 08:07 AM   #8
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I would be thankful to have an answer to my question. I'm mostly concerned about damage in case of electricity cut off.
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Old 28th March 2014, 08:46 AM   #9
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I try not to use speaker protection, the purist in me calls for no shoddy relay contacts in the signal path.

It's a risk you take. My bombproof F5 failed and fried a 350 speaker.
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Old 28th March 2014, 09:26 AM   #10
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Rod Elliotts ESP website has a good protection project P33. A solid state relay avoids the problems associated with mechanical relays both in terms of contact welding, oxidation and distortion due to materials/magnetics, but they do cost more in parts. I have started selling completed SSR modules on my website.
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