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Multi-Way Conventional loudspeakers with crossovers

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Old 4th February 2013, 08:17 AM   #81
balerit is offline balerit  South Africa
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Quote:
Originally Posted by ODougbo View Post
I might be able to get a buddy to help measure the impedance (tomorrow)

So far some songs are sounding very nice. However the woofer is not rolling off at 2200hz, still going to 3500hz or so. (I didn't think the woofer would roll off easily)

The tweeter roll off is close, however to loud.
L-Pad (now) R1= 1.0 ohm R2= 50ohm
What are the sensitivities of the two speakers
?
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Old 4th February 2013, 08:26 AM   #82
ODougbo is offline ODougbo  United States
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Woofer 89db
The Madisound Speaker Store

Tweeter 90.8
The Madisound Speaker Store

The box is lined with cork/felt and 5.5oz of wool
Back is 1" sides are 1" or better!
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Old 4th February 2013, 08:29 AM   #83
balerit is offline balerit  South Africa
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Quote:
Originally Posted by ODougbo View Post
Woofer 89db
The Madisound Speaker Store

Tweeter 90.8
The Madisound Speaker Store

The box is lined with cork/felt and 5.5oz of wool
Back is 1" sides are 1" or better!
Don't forget to add the resistance of the woofer xo coil into the calculations for the L-pad.
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Old 4th February 2013, 08:37 AM   #84
balerit is offline balerit  South Africa
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Sorry, forgot to ask: what are the inpedances of the two speakers at your crossover frequency, I'l run them through my spreadsheet program from my books?
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Old 4th February 2013, 08:53 AM   #85
ODougbo is offline ODougbo  United States
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Noob alert!!!! I understand the Q. but no A.

I'm more of a no-controls crop dusting pilot when comes speaker building (saw your Bio)
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Old 4th February 2013, 11:27 AM   #86
balerit is offline balerit  South Africa
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Originally Posted by ODougbo View Post
Noob alert!!!! I understand the Q. but no A.

I'm more of a no-controls crop dusting pilot when comes speaker building (saw your Bio)
He he he, ok so this is going to be difficult then. What one has to do is test the speakers and measure their impedance at the chosen crossover frequency. This figure is then used to calculate the crossover values as well as the L-pad network. sorry there is just no other way.
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Old 4th February 2013, 07:53 PM   #87
tvrgeek is offline tvrgeek  United States
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But I can attest, he has very good ears and is game. We just have a lot to teach him.

The Silver Flute has breakup issues he has not addressed. This will cause pronounced upper mids. The crossover is a tad too low which is very bad for the XT-25 as it does not know how to stop below 3K, This also causes pronounced midrange. I think they are a tad light in the bass and that would be throwing off the balance. The crossover he is trying does not have sufficient BSC and is actually reducing the slope of the tweeter crossover with that 46 Ohm resistor. More pronounced midrange.

The boxes are a bit of an interesting challenge. Step is going to be purely by measurement, but the typical pole of 200 or 250 is probably a good starting place. I am going to see how those tweets do in such a small round baffle.

As a side note, I never really looked at the SF drivers as they are low end, but they may be a real champ for the price. Take a look if you need a budget woofer.
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Old 4th February 2013, 09:34 PM   #88
ODougbo is offline ODougbo  United States
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Thanks TVR, and btw, the laptop with the speaker programs/mic setup was impressive! Splice...Way Cool!

The bass is good, we just didn't hit any songs with some good bass, e,g, the other day they sounded like sub-woofers; also new boxes - better/thicker wood. I might build more; extra pair here btw......

Now then - Odougbo has been known to pull a rabbit out of his hat now and then.
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Old 4th February 2013, 09:48 PM   #89
tvrgeek is offline tvrgeek  United States
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I'll have to remember to bring some of the music I know next time. You see, I don't listen to either country or western.

Build the crossover they recommended. From the plot, it looks quite reasonable. I only worry if it keeps the tweeter in the happy range. Close.

Study it a bit. You will see they shifted the woofers crossover down, but the resistor is providing a bit of a shelf effect and they are relying on the woofers rolloff due to inductance. So pseudo second order and BSC with only three parts. We may need to tune the notch to your specific drivers, but If I remember, it is very close.
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Old 4th February 2013, 11:22 PM   #90
ODougbo is offline ODougbo  United States
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Graphs:
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