Originally Posted by karan23
Thank you @Trimlock
What about the wattage listed. I get that the impedance is more important but I also read that in some cases the speakers burn out or the amp circuitry. So, would you reckon a pair of these speakers fit for purpose?
Type (Inches) : 4" Coaxial Speaker Type (mm) : 100mm
Power Handling, RMS : 22W (RMS) Power Handling, Peak : 140W Frequency Response : 80 Hz - 15k Hz
Nominal Impedence : 4 ohms Sensitivity ([email protected]
) : 85dB Crossover : None Controls/Adjustments : None
External Diameter : 4" (102.5mm) Mounting Cutout Diameter : 3-3/4" (94.6mm) Mounting Depth : 1-9/16" (39mm) Grill : no
The RMS is 22W but the peak is 140W which has me confused if this is adequate or may burn out.
Ignore "peak" ratings on audio gear. This sounds like car audio gear, which is VERY typically advertised with peak power, though some low-end home audio stuff is advertised that way too. Using car audio speakers in the home is generally OK as long as you have a box that works for the speaker. Speakers for car doors tend to be designed with a specific Qts, Vas, Fs, and may not be ideal to put into a box for home audio usage. But you would still be able to make them work and if your box design is decent, they might even sound OK.
Speakers have limits on how much electrical power they can take before the coil burns. They have limits on how much the cone can move before it hits a mechanical limit. And they have a certain sensitivity rating, which means they put out a certain amount of volume for a given input. This depends on the box they are in also.
You actually don't need to match power ratings directly, but you do need to make sure that both the amp and the speakers are up to the task of what you want to do with them, which mostly means how much bass you want and how much overall volume you want. You do need to make sure your amp can deliver the power your speakers need to get to a given volume. You do need to make sure your speakers can handle that much power and that they can physically move enough air (without hitting the frame of the speaker) to get the volume you want. There is no replacement for displacement.
If you want 90dB of output at 1 meter and your speaker system (meaning your speakers IN THEIR BOXES) is rated for 80dB at 1 watt at 1 meter away, you would need about 10 watts to get 90dB of output. Your speakers thus must be rated to handle that 10 watts, and they must also have enough excursion to reproduce the sound. How much excursion they need also depends on what box they are in, and what frequencies you send. Lower frequency needs more extension.
You could have a 1000w amplifier, but you could have 50w speakers, and as long as you keep the volume control of your amplifier such that it is sending your speakers less than 50 watts, and you aren't sending small speakers a lot of bass, you shouldn't blow anything.
Some people well caution against "underpowering" a speaker - this means if you had a 100w speaker, and a 10w amp, and you really wanted a lot of output but the amp just isn't cutting it... You crank that amp to maximum, it starts clipping (a type of distortion)... ultimately that type of distortion redistributes the power, sends more of it to your tweeter, and makes it likely to blow. This is not a problem with "underpowering" the speaker at all. It's user error where the user was too stupid to know that making their amplifier distort is bad for their speakers (as well as the amplifier itself).
So, just to end with - those speakers are definitely 22 watt speakers, and are definitely not 140 watts. Let's be clear on this. DO NOT send 140 watts OR ANYWHERE NEAR IT to these speakers.
Also do not send a lot of bass to these speakers (even if you're keeping your total power at or under 22w) because they are small and they probably have a very low Xmax (excursion).
Edit: The best thing to do when you have a small amp is to get the most sensitive and efficient* speakers you can. (* Sensitivity and efficiency are not the same thing but they are directly correlated.) Believe it or not, larger speakers tend to be more sensitive, meaning they tend to put out more volume with the same input power. Many people seem to think that larger speakers need larger amps. It is often the case that larger speakers can take more power than smaller speakers. But what many people don't know is that larger speakers are likely to not need as much power as small speakers.