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Which speakers for a simple class D amp car build?
Which speakers for a simple class D amp car build?
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Old 8th November 2017, 07:31 PM   #1
Biertje is offline Biertje  United Kingdom
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Default Which speakers for a simple class D amp car build?

Firstly I hope that this is the right place to post these questions. Secondly apologies for what I feel will be a lengthy post.

I bought a cheap TPA3116D2 50W*2+100W 2.1amp with the idea to use it in my car. I am powering it with a 5v 2.4a power bank. It's only a little classic car that has no sound system at all. I realise I'm not going to get much power with this setup, but I'm just looking for somethings that I can integrate into the car and sounds a little better than my current little bluetooth speaker.I'm not looking to spend vast amounts of money on this

I tried out the system hooked up to my friends little 25w 6ohm speaker and it worked great for what I want. My question is what speakers and subwoofer should i get? or do I even need a subwoofer with such little power?
tl;dr: Basically I'm confused and looking for recommendations for some simple low cost 2.1 speaker setup that's low cost and sounds ok.

I have a few options:

- Buy some 2.1 computer speakers and convert them to use with my amp. I have found a few ones for around £50 that have ~80w rms. which I think is fine for my needs.

And this is where I get confused: My other option is buy some car speakers or some diy hifi speakers and build a little enclosure for them. That way I can spec them for my car.

I found these little drok 15w speakers. Which I was planning to match with this sub.

Then I found some car speakers such as these and it got me wondering do I need a dedicated subwoofer if the sub starts at 65hz and these start at 40hz?

Basically I'm confused and looking for recommendations for some simple low cost speakers.
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Old 9th November 2017, 06:02 PM   #2
chrisb is online now chrisb
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5V? isn't that a bit low for a TPA3116 to develop anywhere near its full output? IINM, most want between 12-24

If you can find a car speaker that'll fit available locations in the vehicle, I'd be inclined to go that way. I'd be surprised if the better ones such as the Pioneers cited didn't deliver far better performance than computer speakers or the little Droks -possibly even better bass than the little 6" "sub"
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Old 10th November 2017, 04:15 AM   #3
Jerms is offline Jerms  United Kingdom
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Even 12V in a car is asking a lot for a TPA3116 to produce enough noise IMO.

Start simple, a pair of car coaxial speakers. See if that floats your boat.
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Old 10th November 2017, 05:22 PM   #4
chrisb is online now chrisb
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Indeed, even at recommended DC supply rails, the rated power on many of the cheapie TPA3116s could be described as "optimistic"
I have a little YJ kit version of one of these in my harem of small amps - it came with a compact 24V 3A SMPS module. Decent enough sounding piece overall, but I'd imagine the quality of this type could vary substantially.

And, yes, I think a simple coax car speaker would be the way to go.
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Old 11th November 2017, 06:59 PM   #5
Jerms is offline Jerms  United Kingdom
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Sure electronics can provide a few options for boosting volts....
Sure Electronics' webstore Boost/Step-down Converter

TDA7498 might be an option if more ooomph! is required. Or even one of the Ti TAS56** series.
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Old 13th November 2017, 12:23 PM   #6
Biertje is offline Biertje  United Kingdom
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Thanks for the replies all. Apologies, forgot to add that I'm using a DC step up unit to go from 5v to anywhere between 12 and 20v and max 3a that the amp requires. I ordered both the drok speakers and some coax car ones. I have tried the drok ones and they seem pretty good for £10 speakers. Will report back once I have tried the coax ones.
The bass is definitely not very loud, and the limitations of the 3 amp dc step up was proving a problem even with the 40w drok sub.I tried it with a 20w sub which worked much better, but didn't quite have enough oomph. I think 30w for the bass is probably the limit for my setup. I guess I can't expect too much from a small amp powered by a phone charger And as you say I don't think the power ratings on the amp are too accurate!
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Old 15th November 2017, 12:23 AM   #7
epifant is offline epifant  Norway
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DC-DC boost power supply module for car high-power adjustable 12V to 24V - 15-35V DC adjustable, 5A max (6A with larger heat sink).
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