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Multi-Way Conventional loudspeakers with crossovers

Which power amplification for different powered speakers ?
Which power amplification for different powered speakers ?
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Old 12th July 2018, 06:55 PM   #11
TanguyClt is offline TanguyClt  France
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No I connected 3 pack of 3 cells in serie, in parallele to imrouve the duration. The fact is that when they are fully charged, 18650 battery is to 4.2V so 7x4.2=29.4 and it is too much too no ?
And can you tell me how do you know that 25V is the best because it is wrote that it can be connected in a range of 12~24V

Last edited by TanguyClt; 12th July 2018 at 06:58 PM.
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Old 12th July 2018, 07:07 PM   #12
TanguyClt is offline TanguyClt  France
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Can you tell me if it is possible to have a class A/B amp for around 20$ and if I can take a 100W one, indeed my current amp as a maximum of 50W witch is the RMS of my subwoofer so if I take a 100W one (witch is the maximum of my sub) it will fit perfecly with my sub and the 20% witch get the tweeter fit also good with the 20W of my tweeter.
thanks for your usefull answers
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Old 12th July 2018, 08:21 PM   #13
Galu is offline Galu  Scotland
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There is cause for confusion - you said 12.6V in post #8!

29.4V is the emf (E) of the battery. The voltage (V) across the terminals of the battery will fall when the amplifier draws current from the battery. This is due to voltage being 'lost' in driving current through the internal resistance of the battery.

When a loud passage of music occurs, the voltage (V) may fall so far that the amplifier distorts.

This would be cured by a stronger power supply.

I would think about this before giving up on your present amplifier.

P.S. I got the supply voltage information from the amp's data sheet which is available on-line as a pdf.
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Old 12th July 2018, 08:44 PM   #14
Galu is offline Galu  Scotland
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Quote:
Originally Posted by TanguyClt View Post
Can you tell me if it is possible to have a class A/B amp for around 20$ and if I can take a 100W one?
Perhaps something like this?

Search: LM3886 100W Mono Class AB audio power amplifier board.

Note: I have no experience of these amp boards and do not know how well they perform!
Attached Images
File Type: jpg LM3886.jpg (15.2 KB, 21 views)
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Old 12th July 2018, 09:39 PM   #15
TanguyClt is offline TanguyClt  France
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ok thanks I will search for buy a new amp

Last edited by TanguyClt; 12th July 2018 at 09:42 PM.
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Old 12th July 2018, 09:50 PM   #16
Galu is offline Galu  Scotland
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Quote:
Originally Posted by TanguyClt View Post
And can you tell me how do you know that 25V is the best because it is wrote that it can be connected in a range of 12~24V
From Class D amp Data Sheet:

Power output is 40W (at 10% distortion) with 25Vdc, but only 15W with 12Vdc.

A new amp will still require a strong power supply! You need to consider that before buying a new amp.

Last edited by Galu; 12th July 2018 at 09:58 PM. Reason: Extra info
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Old 12th July 2018, 09:57 PM   #17
TanguyClt is offline TanguyClt  France
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Do I really have to get around 30V for these kind of amp ? because it will decrease my battery life to put them in series instead of parallele.
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Old 12th July 2018, 10:14 PM   #18
Galu is offline Galu  Scotland
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Quote:
Originally Posted by TanguyClt View Post
Do I really have to get around 30V for these kind of amp ? because it will decrease my battery life to put them in series instead of parallele.
Your class D amp needs a 24/25V power supply. It should be capable of providing a current of about 2.5A at its rated voltage.

Two high capacity 12V sealed lead acid batteries in series will give the required voltage, as well as being able to supply the large current without dropping their voltage too much.

Of course, they cost money and you would also need to buy a charger for them.

The alternative is to buy a suitable mains operated supply.
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Old 12th July 2018, 10:37 PM   #19
TanguyClt is offline TanguyClt  France
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Yes think I will stay on litthium because I recycled them so it cost me nothink and I don't now how to deal with acid battery. If I buy a class D 100W mono amplifier it should be better no ? I mean, if the distotion come at some sound level for a 50W amp, for the same sond level it souldn't be distorted with a 100W one right ?
I say that because (tell me if I am wrong) a class D amp is better for the battery life than others, so if I havn't any issue with a class D amp it will be better.
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Old 12th July 2018, 10:45 PM   #20
Galu is offline Galu  Scotland
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You have been powering your class D amp with 12Vdc.

I hope you now understand that it is best powered with 24Vdc.

24Vdc will get you 30W at 1% distortion and 40W at 10% distortion.

But the power supply must be able to supply a large current (at least 2A).

Your lithium batteries may not be suitable for this purpose.
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