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Multi-Way Conventional loudspeakers with crossovers

Dayton TCP115-8 small desktop speakers
Dayton TCP115-8 small desktop speakers
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Old 27th December 2018, 02:45 AM   #1
Jared is offline Jared
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Default Dayton TCP115-8 small desktop speakers

I just wrapped up a test build for the TCP115-8 and I find myself very impressed by this little 4" woofer.
Dayton Audio TCP115-8 4" Treated Paper Cone Midbass Woofer 8 Ohm


I built another $30/pr silk purse contestant entry.
I used 1/2" plywood and did a box 10.5"x 5.75" x6" external dimensions, and did an approx 11" long 1.25" port for about 45hz tuning. I am not 100% sure on port length as I used a 3.5", a 7", and a 90 degree elbow to get the port to fit the smallish enclosures.
Tweeter for the test build was a cheap GRS mylar from parts express crossed over with a single 5uf cap I pulled out of a dimmer circuit lol. ( hey, its a good cap!)

I ran them for a few hours sealed as I did not have any PVC pipe for ports and enjoyed the sound in spite of what I suspect is a pretty gaping hole in the mid range. When I added the port the bottom end opened up a ton. I hope to get some measurements tomorrow to see how low they are playing as well as how bad the "only parts laying around" crossover/tweeter ended up working out.
For comparison sake I cannot even say what they stack up against as they are not boomy like my previous $30 entry with (2) 6.5" buyouts per side, but then so far I have only run these off of a 2.5 watt/ch chip amp and a cell phone which is barely moving the cone.

I will get some measurements running off of a TPA3116 and macbook which will be a direct comparison with how I measured the previous entry. I think these warrant a real crossover and a better tweeter though.

Pics have tissue box for size reference.
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Old 27th December 2018, 02:54 AM   #2
Jared is offline Jared
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hors resp images with 20watts input, prob more than I will ever use being a few feet away on a computer desk and eventually assisted with a micro subwoofer. Screenshots with and without high pass.
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Last edited by Jared; 27th December 2018 at 02:57 AM. Reason: screenshots
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Old 27th December 2018, 04:57 PM   #3
Jared is offline Jared
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REW shows things are both much worse and much better than I expected. I expected a large and wide midrange dip as the tweeter is crossed over quite high (5uf on 4 ohm is 8khz iirc) but that is not there. What is there is not very smooth and the distortion seems a bit high?
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Old 27th December 2018, 10:04 PM   #4
5th element is offline 5th element  United Kingdom
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For good distortion measurements you need a good signal to noise ratio. Plus the scale on your Y axis squashes everything together. Make the major Y axis divisions 10dB instead of 20.
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