The speaker built into most CB radios is small, buried under the dash and easily drowned out by road noise – which is why an external speaker is the cheapest, most satisfying upgrade you can make to a CB. Mount one at ear level and a mumbling radio suddenly becomes clear. The only real decisions are how much power you need and whether you want a passive speaker or an amplified one.
We picked four that cover every cab, from a tiny 5-watt clarity upgrade to an amplified speaker that boosts a too-quiet radio. They are all 8-ohm units that match standard CB outputs and mount with the included bracket.
Top picks at a glance
- Best overall: the Uniden BC20 – rugged 20-watt clarity.
- Too-quiet radio? the amplified Uniden BC23A.
- Best value: the Astatic 302-VS6.
| Speaker | Power | Amplified | Best for |
|---|---|---|---|
| Uniden BC20 (20 W) | 20 W | No (passive) | Loudest passive |
| Uniden BC23A (15 W amplified) | 15 W | Yes | Boosting a weak radio |
| Astatic 302-VS6 (10 W) | 10 W | No (passive) | Best value |
| Astatic 302-VS4 (5 W) | 5 W | No (passive) | Budget / compact |
1. Uniden BC20 (20 W) — Best overall
The BC20 is the one most people should buy: a rugged, sealed 20-watt speaker that takes everything a CB pushes at it and stays clear, with a mounting bracket and a long lead. It relocates your audio to ear level and cuts through road noise far better than a radio’s built-in speaker. The catch: It is passive, so it makes the most of the radio’s output but does not amplify a genuinely weak signal.
Verdict — Buy it: the durable, great-sounding default for most trucks and CBs.
2. Uniden BC23A (15 W amplified) — Best amplified
When your radio is simply too quiet in a loud cab, an amplified speaker is the fix – the BC23A has its own amplifier, so it boosts volume beyond what the radio can manage on its own. It is the choice for big rigs and noisy diesels where a passive speaker is not enough. The catch: It needs a power connection and can add hiss if you crank the gain too high.
Verdict — Buy it: the answer when even a good passive speaker is not loud enough.
3. Astatic 302-VS6 (10 W) — Best value
The VS6 is the sweet spot for most cars and pickups: 10 watts of noise-cancelling output and the classic Astatic build, for less than the big Uniden. If you do not need 20 watts, this is plenty of clear, louder audio. The catch: Not as loud or rugged as the 20-watt BC20 for a heavy-truck cab.
Verdict — Buy it: the smart middle pick for cars and light trucks.
4. Astatic 302-VS4 (5 W) — Best budget
If you just want to move the sound to a better spot for a few dollars, the compact 5-watt VS4 does it. It is small, simple and one of the most-reviewed CB speakers around – a no-frills clarity upgrade for tight installs. The catch: At 5 watts it is the quietest here, so it is not for a loud diesel cab.
Verdict — Buy it: the cheap, compact way to relocate and clean up your CB audio.
How to choose a CB external speaker
Two questions decide it. How loud is your environment? A car or pickup is fine with a 5-10 watt passive speaker (VS4 or VS6); a heavy-truck cab or noisy diesel wants the 20-watt BC20, or an amplified BC23A if the radio itself is too quiet. Passive or amplified? A passive speaker just relocates and clarifies the radio’s own output – simpler and hiss-free. An amplified speaker has its own power and can go louder than the radio alone, at the cost of a power wire and a little potential hiss.
After that, match the impedance (almost all CBs and these speakers are 8 ohm), mount it at ear level away from rattly panels, and you are done. A clear speaker also makes a weak signal easier to copy – though for actual range, it is the antenna that matters: tune yours with one of our best SWR meters. Setting up a rig from scratch? See our best CB radios for an RV and the best CB radios hub.
CB external speaker FAQ
Do I need an external speaker for my CB?
Not strictly, but it is the cheapest worthwhile upgrade. A built-in CB speaker is small and dash-mounted; an external one at ear level is far clearer and louder over road noise, which makes a real difference on long drives.
What is the difference between a passive and amplified CB speaker?
A passive speaker simply relocates and improves the radio’s own audio – no power needed and no added hiss. An amplified speaker has its own amplifier and power wire, so it can play louder than the radio alone, useful in very noisy cabs.
How many watts should a CB speaker be?
For a car or pickup, 5-10 watts is plenty. For a heavy-truck cab or a loud diesel, go for 20 watts, or an amplified speaker if the radio itself cannot get loud enough.
Will any external speaker work with my CB radio?
Almost – match the impedance (nearly all CBs and these speakers are 8 ohm) and use the external-speaker jack on the radio. The plug is usually a standard 3.5mm mono, included on these models.
Does an external speaker improve range?
No – range comes from the antenna and tuning, not the speaker. What a good speaker does is make a weak or noisy signal far easier to hear and understand, so you copy more of what is actually getting through.
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