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Class D Switching Power Amplifiers and Power D/A conversion

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Old 24th May 2013, 02:07 PM   #1
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Default Best amp for my needs?

So I've been doing quite a bit of research to try and figure out the best amp for my particular needs, but I'll be honest; I'm a bit confused by the differences between amplifiers, the customizations people are doing, et al. I ended up purchasing a TDA7492 amp from Parts Express and it's working alright, however I am getting some distortion at higher volumes (with the gain set to low) that I don't care for. I'm hoping you fine folks can point me to a better amp that will suit my particular needs. Those needs are:

- Powered by an EVO2 battery that puts out about 14v fully charged but will run around 13v most of the time.
- Input source is an iPod. Volume controlled by the iPod.
- No onboard volume control, EQ, gain, etc is required.
- Will be driving a pair of 4 Ohm Infinity marine speakers

Ideally I'd like a simple amp that's pre-built, though I'm open to DIY if it's required to achieve my needs and am decent with a soldering iron.

Any thoughts?

Last edited by squirrelbob; 24th May 2013 at 02:11 PM.
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Old 24th May 2013, 05:36 PM   #2
rjsaenz is offline rjsaenz  United States
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I would go with a t-class amp. What is your price range ?
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Old 28th May 2013, 01:07 PM   #3
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Well, the price doesn't really matter so long as the amp meets my needs. Like I said, I don't need anything fancy and the entire unit is already enclosed in a stainless steel box, so I don't require a case for the amp at all. A plain circuit board is just fine.
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Old 28th May 2013, 04:17 PM   #4
rjsaenz is offline rjsaenz  United States
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I would go with hifimediy t1-m. It has a wide range of voltages it can handle and can utilize your 14v battery. It will also work with your 4ohm speakers.

Hifimediy T1-M TK2050 9 - 24V


Robert
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Old 29th May 2013, 05:19 PM   #5
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Looks decent. For the price, I'll definitely give it a try. I also picked up a step-up voltage regulator which I'm going to toss into the loop. Never used one before and I imagine it will cut down on my battery life, but I can afford to lose some longevity. Anyway, we'll see how it comes together when the parts arrive. Thanks!
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Old 29th May 2013, 05:55 PM   #6
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sounds like your input impedance is off. is there anyway you can increase your gain at the input? like with a headphone amp? or that battery may be too small. these last me 11 hours on a TA2020: Amazon.com: Rechargeable 12V 7AH Sealed Battery: Electronics

that amp should be clean and bumpin.
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Old 30th May 2013, 06:30 PM   #7
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I was looking at getting the Hifimediy T1-M. It is showing about 14.5 Watts into 4 ohms with 12Volts while the lepai ta2020 shows about 20 watts into 4 ohms. Do you think the Lepai data is inflated or do you think it would be louder than the HIFIMEDIY T-1 M? I am going to be putting this into a "Boominator"
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Old 7th June 2013, 12:34 PM   #8
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In my opinion they are both around $25 ea correct?, but by the time you add some freight etc... you know it not that expensive to better quality amps.

I cannot say one is better than the other without listening to both, but looking at the electronics on the Hifimediy, I can guarantee it will be better than the Lepai.

Depending on the sensitivity of the speakers hooked up, I would even try to go better than that. I Highly recommend something a bit special like the Amp6 from 41hz, which was about $115 delivered for 2, huge difference.

Lepai is cheap crap really. (I do use one for my TV stereo upstairs, and 1 in my workshop) :-) but they are pretty low sensitivity.

When you build a boominator, the most Expense is your time, so spend up on the components, you'll hear it...
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Old 9th June 2013, 04:05 PM   #9
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Location: I live in Hattiesburg,Mississippi
I have an ADS Powerplate 40 I would let go of for $75.00 and a ADS PowerPlate 80 I would sell for $100.00 you will not find a better Amp that ADS. They were some of the best made . They actually built the first car amp that incorporated a Switch Mode Power Supply .
I also have a Harmen Karden 20 x2 I will sell for $40.00.
If you want good sound get a good amp a cheep chip amp will not even sound close to as good as one of these
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