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Old 4th November 2017, 10:13 PM   #1
diy1995 is offline diy1995
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Location: Slovenia
Default Impedance matching...

Hello,
I builded push-pull design woofer from two 30w 5.25inch woofers, but one is 4ohm and other is 8ohm.
It plays nice, but I ran into the problem that one gets more power than the other...
impedance matching.jpg

How can I solve this to deliver the same power to both speakers?
I think that I need to add a resistor (4ohm in series with 4ohm speaker?)

Thank you for help
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Old 4th November 2017, 10:35 PM   #2
rayma is online now rayma  United States
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Quote:
Originally Posted by diy1995 View Post
How can I solve this to deliver the same power to both speakers?
There's no way to passively have both receive the same power other than with
an autotransformer for the 4R (which is impractical).
You'd have to use a separate power amplifier for each, and set the acoustical
volumes equal, with the input level control.
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Old 4th November 2017, 11:00 PM   #3
diy1995 is offline diy1995
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Quote:
Originally Posted by rayma View Post
There's no way to passively have both receive the same power other than with
an autotransformer for the 4R (which is impractical).
You'd have to use a separate power amplifier for each, and set the acoustical
volumes equal, with the input level control.
Thats what I was afraid of. now I have to put another amp in my stuffed room :S
thank you for help
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Old 4th November 2017, 11:02 PM   #4
rayma is online now rayma  United States
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Quote:
Originally Posted by diy1995 View Post
Thats what I was afraid of. now I have to put another amp in my stuffed room.
It's not so bad, there are cheap class D amplifiers that should work fine for this used in pairs.
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Old 4th November 2017, 11:06 PM   #5
nigelwright7557 is offline nigelwright7557  United Kingdom
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Location: Carlisle, England
It would be cheaper to buy a new woofer than buy a new amp.
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PCBCAD51 pcb design software. 2018 version out now with lower prices >> http://www.murtonpikesystems.co.uk
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Old 5th November 2017, 11:38 AM   #6
diy1995 is offline diy1995
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Quote:
Originally Posted by nigelwright7557 View Post
It would be cheaper to buy a new woofer than buy a new amp.
I know but I can use spare amp that I already have so thats no problem.
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Old 5th November 2017, 06:07 PM   #7
diy1995 is offline diy1995
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I`m looking at cheap amp from aliexpress but I will ask for opinions in amplifiers section.
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