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Old 22nd April 2014, 05:32 PM   #1
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Default how to protect 15W speaker from raising volume

hi
i buy 15W full range 4" nice speaker for my open baffle.
i have DC protection but how i can protect from large power, more then 15W?

i read about fuse but its herd to know what i need.

thanks
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Old 22nd April 2014, 08:42 PM   #2
xrk971 is online now xrk971  United States
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Use a small 8 watt amp. Try Sure TPA3110D2 with 12 volt power supply.
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Old 22nd April 2014, 09:00 PM   #3
chrisb is offline chrisb  Canada
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well, it's not unknown for a low powered solid state amp to damage drivers when driven hard into clipping, so that's no guarantee of protection - there is it the old light bulb trick often used for tweeter protection, but you'll have to do your own research on determining the values

of course if you're talking OB with a small FR driver, such a system would normally be assumed to include a supporting woofer, in which case a HP filter for the small driver will reduce the energy content over the small driver's operational bandwidth
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Old 22nd April 2014, 09:10 PM   #4
xrk971 is online now xrk971  United States
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The TPA3110 class D amp works with supply voltages as low as 5 volts. One could calculate what the max voltage that the driver can handle and use a variable voltage power supply set at the max safe voltage. Even if amp clips, safe level is never exceeded. Assuming safe level is at least 5 volts.
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Old 22nd April 2014, 10:14 PM   #5
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hi
my amp is F5 25W class A. i dont want to replace it.
yass i have 15" speaker for the low freq. but the FR not need filter.

i think meybe try fuse or lamp.
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Old 22nd April 2014, 10:23 PM   #6
xrk971 is online now xrk971  United States
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Nice amp - probably cost you $700 in parts to build? Try the TPA3110D2 for $10 and see if you can tell the difference in sound quality. I am not kidding that $10 amp sounds very good and it costs less than the electric bill from running your F5 for a week. . At least as an experiment you have not much to lose and you may end up saving your driver and the environment. Alternatively, try the TPa3116d2 YJ blue board for $20 and it even sounds better with more power - although doesn't sound like you need it since you don't want to blow your driver.

Last edited by xrk971; 22nd April 2014 at 10:27 PM.
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Old 22nd April 2014, 11:33 PM   #7
Jsixis is offline Jsixis  United States
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light bulb is the easiest way but common sense works for me.
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Old 22nd April 2014, 11:51 PM   #8
freddi is offline freddi  United States
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211-2 or 212-2 bulb
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Old 23rd April 2014, 12:06 AM   #9
sreten is offline sreten  United Kingdom
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Hi,

The FR needs a filter, as does the 15". With a filter
and 25W the FR will be fine, no chance of blowing it.

Try a series 1st order crossover, at say 300Hz.

rgds, sreten.
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Old 23rd April 2014, 12:51 AM   #10
chrisb is offline chrisb  Canada
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once you hear the full-ranger relieved of the heavy duty in the bottom few octaves, particularly in an OB where it's very easy to exceed designed X-Max, I think you'll understand why

if you have a spare grunt amp for the bottom (120-150W wouldn't hurt), and can institute input level controls on both amps, passive line level / active can be much cheaper to experiment with and implement, and many would argue surpasses passive speaker level XO in sonic transparency
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