How loud would 1250 watts topically sound with maximum gain on a subwoofer while played at a normal volume on a stereo? ?

I would really love to know. I have a 10 inch Sunfire subwoofer that I’m hooking up to my home theater receiver and can’t wait to find out!

8 Answers

  • 8 months ago

    There is no way to know with the information you gave.  There is much more information needed to give you a reasonable answer.  


    40 years high end audio video specialist

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  • 8 months ago

    Probably like crap. How loud a speaker can mechanically play has nothing to do with power handling, or how many watts you throw at it . It depends on the SPL of the speaker though. (look it up) Sub-woofers sound okay when balancing the output of the other speakers in the system. Too loud, drowns out the rest of the system, To soft, wont do the material played any favors. Way to loud, you become clinically deaf, and your music listening days are over.  Just the way stuff works. Machines, like speakers or garden tractors, have built in limits . Too much wattage, or too much nitroglycerine in the gas, and they blow up. Usually high power amps are purchased for only two reasons. One, is to handle fleeting transient sounds and dynamics cleaner, (usually at lower volumes) the other is to makeup for really horribly inefficient speakers, like ones with lead cones or something.

    I'll point out that using any intervening  pre amplifier volume controls amount to taming the  "gain" of an amp. And that only class "A" amplifiers are operating at full gain all the time. There is almost no way of integrating a sub-woofer or an externally or internally amplified Sub-woofer without using a volume control, whether that control is implemented by switch, or rotary control, or at the speaker,amplifier, pre-amplifier, or as built into a receivers output circuit for the LFE effects channel.

    One way or another, you need to balance the output volume of all the speakers correctly.

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  • Steven
    Lv 7
    8 months ago

    A typical sub woofer is about 1% efficient so 1250 Watts would produce about 12.5 acoustic Watts which is about 131dBA at 1 meter. However if your subwoofer is smaller than 24inches then the efficiency is probably somewhat less. In any case please understand that 100 Watts is still a dangerous 120dBA so using a 1250 Watt amplifier is a bit stupid.

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  • 8 months ago

    First, I can't wait to see you back here with a blown speaker and amp.  Anyone with a plan that sounds risky and they qualify it with "can't wait"...can't wait is what makes so many repairmen their hourly wage.  They love to repair amplifiers melted by people that think the gain control is a volume knob!

    First, when it comes to "how loud", there are far more factors at play than spacemissing even begins to touch on. 

    The first factor is, of course, power.

    Speaker sensitivity is another.

    For subwoofers, enclosure type and size are huge impactors. Why one would fail to mention this basic precept of subwoofers is a mystery. 

    Vented enclosures tend to be louder and thus more efficient per given input of wattage, however sacrifices in total power capacity and frequency rolloff will be seen in most drivers.

    If the enclosure is a vented style, the port frequency can also affect total spl.

    Speaker placement and orientation also play a large factor in subwoofer output.

    The most important thing to consider is what the impedance capacity of the amplifier is, make sure your speaker isn't wired for a lower impedance.  If your amp will only do 6 ohms and you wire it for 2, you are in for big trouble with the speaker AND the amp, because you will introduce clipping and distortion, both of which will wreck the speaker and amp long before "power" ever will.  And make sure the enclosure and speaker are suited to each other.  The right speaker in the wrong enclosure is even more wrong than the wrong speaker in the right enclosure.  If that makes any sense.

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  • 8 months ago

    Loudness cannot be directly equated with amplifier power.


    The sensitivity of the speaker(s) is the other factor that must be considered. 


    The only way to know with certainty how loud a sound is 

    is by measuring it. 


    Fortunately, SPL meters are very affordable and easily found. 

    You might want to get one and experiment with it. 

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  • 8 months ago

    A college friend's car system sounded good enough as it was, but he once turned on the +12 dB switch. The vocals and instruments were so faint by comparison that I would describe the experience as the not-much-more-than-bass remix.

    I don't remember the precise year, but it could not have been later than '93.

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  • 9 months ago

    Now what? "Maximum gain" or "normal volume"? Oh, and what kind of watts? PMPO is somewhat different from RMS. 1250 watts RMS is approximately what my stove puts out on a single plate - in a 10" speaker, that would be sufficient to melt the coil - but for those few seconds it lasts, you could boil a kettle on it.

    A bit more seriously - the terms you used are extremely undefined, including your question about "how" loud it would sound.

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  • Rick
    Lv 7
    9 months ago

    loud enough that you'd be deaf after the first song .........................

    • Robert J
      Lv 7
      8 months agoReport

      Yep, bleeding-from-the-ears loud!

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