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Old 23-01-2025, 10:21   #1
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external speaker for ICOM M330 VHF radio

I want to buy an external speaker for my ICOM M330 VHF radio. There are two versions of such a speaker, impedance 4 ohms or 8 ohms. The radio manual does not say anything about it. Which version of the speaker should I choose? Or maybe it does not matter?
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Old 24-01-2025, 07:02   #2
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Re: external speaker for ICOM M330 VHF radio

The external horn speaker [SP-37] Icom offers, is a 4 Ω impedance.
https://www.icomjapan.com/lineup/options/SP-37/
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Old 24-01-2025, 07:24   #3
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Re: external speaker for ICOM M330 VHF radio

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Originally Posted by GordMay View Post
The external horn speaker [SP-37] Icom offers, is a 4 Ω impedance.
https://www.icomjapan.com/lineup/options/SP-37/

I need a different type of speaker, such as the I-Com SP-24. There are two versions of this type of speaker: impedance 4 or 8 ohms. Which one to choose for the M330 radio?
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Old 24-01-2025, 08:18   #4
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Re: external speaker for ICOM M330 VHF radio

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Originally Posted by Andrew11 View Post
I need a different type of speaker, such as the I-Com SP-24. There are two versions of this type of speaker: impedance 4 or 8 ohms. Which one to choose for the M330 radio?
Icom standardized their external speaker impedance many decades ago to 4 ohms. As a practical matter, you can use either with minimal noticeable difference in audio output easily compensated by simply increasing audio level.
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Old 24-01-2025, 10:32   #5
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Re: external speaker for ICOM M330 VHF radio

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Originally Posted by S/V Illusion View Post
Icom standardized their external speaker impedance many decades ago to 4 ohms. As a practical matter, you can use either with minimal noticeable difference in audio output easily compensated by simply increasing audio level.
In general, if you cannot match impedance, use a speaker with higher impedance, which requires less power from the radio, and outputs less power, as Illusion indicates.
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