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Old 16th December 2011, 07:57 PM   #271
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Quote:
Originally Posted by ljm_ljm View Post
Please refer to the IR company.
Are the same.

IRAUDAMP7S-150 =L15D
-200=L20D
Quote:
Originally Posted by ljm_ljm View Post
I suggest not used for any replacement.

Use + - 65 V voltage. Be better able to reach 200 W 8 R, 300 W 4 R. Output and distortion is small.

Very nice.
Hi ljm_ljm,

You mention above that L20D could reach 300W at 4R. But in the models table it says that the 200 shows N/A. I would like to purchase one of your boards L15D or L20D to be able to play at max 250-300W at 4R. Can the L20D achieve this?

I've seen trevmar nice writeup on the L20D board. Is the L15D just as good?
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Old 16th December 2011, 09:59 PM   #272
MrSlim is offline MrSlim  Canada
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Quote:
Originally Posted by exipnos View Post
Hi ljm_ljm,

You mention above that L20D could reach 300W at 4R. But in the models table it says that the 200 shows N/A. I would like to purchase one of your boards L15D or L20D to be able to play at max 250-300W at 4R. Can the L20D achieve this?

I've seen trevmar nice writeup on the L20D board. Is the L15D just as good?
The L15D and L20D are the same circuit, with several resistor changes to allow for different Power supply and power output ratings.. Besides being able to provide higher current, the L20D and L15D should sound the same..
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Old 17th December 2011, 09:31 AM   #273
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Originally Posted by MrSlim View Post
The L15D and L20D are the same circuit, with several resistor changes to allow for different Power supply and power output ratings.. Besides being able to provide higher current, the L20D and L15D should sound the same..
Okay excellent. Then do you know if the L20D in the stock version without any modifications will drive 4ohm speakers and if so at what voltage? 65 or more?
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Old 17th December 2011, 02:13 PM   #274
MrSlim is offline MrSlim  Canada
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Originally Posted by exipnos View Post
Okay excellent. Then do you know if the L20D in the stock version without any modifications will drive 4ohm speakers and if so at what voltage? 65 or more?
No, according to the Reference Design that they are based on, as well as the info I see on ebay about the L20D, they do not specify a 4ohm rating for then L20D. The L15D is capable of 250W into 4ohms though, with +-50V supplies, so you should probably go with them instead.
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Old 18th December 2011, 02:50 PM   #275
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by exipnos View Post
Hi ljm_ljm,

You mention above that L20D could reach 300W at 4R. But in the models table it says that the 200 shows N/A. I would like to purchase one of your boards L15D or L20D to be able to play at max 250-300W at 4R. Can the L20D achieve this?

I've seen trevmar nice writeup on the L20D board. Is the L15D just as good?


L15D + -50V 250W 4R。
it is Very good sound quality. As IRAUDAMP7 same.

With enough power.
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Old 18th December 2011, 02:53 PM   #276
ljm_ljm is offline ljm_ljm  China
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L20D can drive 4 ohm speakers. Voltage and drive 8 ohm is the same.

Recommendation is +-60V.
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Old 19th December 2011, 06:04 AM   #277
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Default Help me decide

Hello ljm_ljm and others.

I'm ready to order your modules but I would like some confirmations on my setup before I go ahead. I want to use 8 modules of either L15D or L20D for a total of 16 channels of amplification.

L15D Digital Audio amplifier kit IRS2092 IRFI4019H | eBay
L20D Stero Power Amplifier Board IRAUDAMP7-200 IRS2092 | eBay

The price difference is not big so the question is which board should I choose for the highest cleanest power up to 250W either in 8ohm or 4 ohm. L20D I assume.

I'm thinking or ordering two of connexelectronic 2000W SMPS.

Connexelectronic

His standard voltage options are 54V, 60V or 72V. I'm thinking to go with the recommended 60V but how much output will that give me in either 8ohm or 4ohm

If I want to drive cleanly upto 250W I assume 2 SMPS are enough.

If I used a linear power supply I was also recommended to order the following power supply board.

eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices

If I use the SMPS with the recommended voltage will I still need the power supply modules?

I've also seen the recommendation to use the following speaker protection board.

eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices

My SMPS have 12V auxillary output so can I use it with this speaker protection kit even though it says 15V?

Final question. I like DIY and can follow directions and can do some easy soldering. But I'm not an expert in electronics. By using completed modules I hope I can easily assembly a complete amplifier. Is this feasible? Since I need 16 channels the total amount will easily be 900-1000$ so I don't want to make a big expensive misstake. Is this feasible.
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Old 21st December 2011, 11:19 PM   #278
skood is offline skood  Australia
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i would like to use the L20d for bass and L15d for mid but use the same smps.
What would the most appropriate voltage be that would work optimally for both? eg 60V ??
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Old 22nd December 2011, 12:36 AM   #279
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Originally Posted by skood View Post
i would like to use the L20d for bass and L15d for mid but use the same smps.
What would the most appropriate voltage be that would work optimally for both? eg 60V ??
They are not meant for the same supply.
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Old 22nd December 2011, 02:05 AM   #280
MrSlim is offline MrSlim  Canada
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Quote:
Originally Posted by skood View Post
i would like to use the L20d for bass and L15d for mid but use the same smps.
What would the most appropriate voltage be that would work optimally for both? eg 60V ??
Just use the L20D for everything.. that way you can use one 70V supply.. There is only about $5 difference between them anyway..
The difference between the L20D and L15D, besides the Power Mosfet is basically due to the adjustments for higher PS voltages and thus higher current outputs
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