4in cube speaker

tomsamps · 29th January 2011, 03:34 AM

I have a 4in. 4 ohm 5watt full range speaker and want to build a little cube enclosure for it. It will be a micro guitar practice amp (1/2 watt output or so out of a opamp) so I would like a simple (cheap) lowpass filter at 4 to 5k frequency range. I also would like the enclosure as small as I could make it with a port to help the bass response of the little driver.

Has anyone done something like this? It is a little different, since I am trying to maximize the tonal characteristics of a much smaller frequency range of the speaker 80 to 5k, throwing the rest away.

Thanks for any insight!

picowallspeaker · 29th January 2011, 04:10 AM

Which bass ??? What about a 12 inch -150 W fullrange ???

Since very low power (chip) amps cannot drive complex loads ,which might not be the case , putting an inductor (coil) before the speaker cuts the treble. A 0.1-0.3 uH inductance would do the job (don't need 'fat' wire...) . Better if you limit bandwidth before the amp ,instead :simple RC work perfectly.
Take a look at this example (which is 2nd order ,i.e. 12 dB/octave attenuation)
This is the line level crossover

The cabinet

can be also open-back ,or totally closed ...at these power levels air compression is quite negligible...

29th January 2011, 03:34 AM	#1
tomsamps diyAudio Member Join Date: Jan 2011	4in cube speaker I have a 4in. 4 ohm 5watt full range speaker and want to build a little cube enclosure for it. It will be a micro guitar practice amp (1/2 watt output or so out of a opamp) so I would like a simple (cheap) lowpass filter at 4 to 5k frequency range. I also would like the enclosure as small as I could make it with a port to help the bass response of the little driver. Has anyone done something like this? It is a little different, since I am trying to maximize the tonal characteristics of a much smaller frequency range of the speaker 80 to 5k, throwing the rest away. Thanks for any insight!

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29th January 2011, 04:10 AM	#2
picowallspeaker diyAudio Member Join Date: Apr 2007	Which bass ??? What about a 12 inch -150 W fullrange ??? Since very low power (chip) amps cannot drive complex loads ,which might not be the case , putting an inductor (coil) before the speaker cuts the treble. A 0.1-0.3 uH inductance would do the job (don't need 'fat' wire...) . Better if you limit bandwidth before the amp ,instead :simple RC work perfectly. Take a look at this example (which is 2nd order ,i.e. 12 dB/octave attenuation) This is the line level crossover The cabinet can be also open-back ,or totally closed ...at these power levels air compression is quite negligible...

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