Crossover Help Request for PE Closeout drivers

[clm811]

Hi All.

I was hoping someone could suggest a crossover design for a 6" 2-way I'm building as a graduation gift for my kid. I have no simulation software, so I'm asking for help.

I've got two drivers on closeout order from Parts Express at very reasonable cost.

The 6" woofer specs are: "Power handling: 80 watts RMS/160 watts max *VCdia: 1" *Le: 1.13 mH *Impedance: 6 ohms *Re: 4.47 ohms *Frequency response: 40-3,500 Hz *Fs: 64 Hz *SPL: 89 dB 1W/1m *Vas: 0.22 cu. ft. *Qms: 3.98 *Qes: 0.47 *Qts: 0.42 *Xmax: 2.5 mm "

JAMO 20422 6" Treated Paper Cone Woofer 6 Ohm | JAMO 20422 6" Paper Cone driver Woofer speaker midrange mid jamo_buyouts_10C ccflippy | Parts-Express.com

and
1" dome tweeter specs are: "Power handling: 50 watts RMS/100 watts max VCdia: 1" *Impedance: 4 ohms *Re: 3.1 ohms *Frequency response: 1,000-20,000 Hz *Fs: 1,070 Hz *SPL: 94 dB 2.83V/1m. "

Vifa BC25TG19-04 1" Textile Dome Tweeter 4 Ohm | Vifa BC25TG19-04 Tymphany DU0207 BC25TG15-04 BC25SG15-04 IC0465-01-1 dali Dome Tweeter 4 Ohm tweeter peerless vline waveguide hf high frequency mtm PeerlessBuyouts612010 | Parts-Express.com

I already have the boxes, which have a baffle 15" High x 7.5 Wide with an edge chamfer beyond that.

Thanks in advance for your assistance!

-Chas

[PeteMcK]

without an impedance plot it's impossible to design a good crossover.
I suggest you download ARTA: ARTA ARTA Download
Make this simple jig: ARTA Jig - AudioBlog: A simple loudspeaker measurement jig for ARTA
and you're in business...

[clm811]

I should clarify:

I have the Jamo crossover for the Jamo woofer, which gives a 2nd order low-pass rolloff at 3kHz...

I just need help with the high-pass for the substitution of this Vifa tweeter (impedance plot/link found here:
http://www.parts-express.com/pdf/279-175s.pdf

Thanks.

-Chas

[PeteMcK]

read off the impedance value at your xover freq & plug the numbers into this calculator:
Crossover Design Calculators
Then work out the difference in dB between the woofer & tweeter and calculate an l-pad on the same calc page.

That will get you close enough to get started, you can tweak from there. Specifically you may want to add baffle step correction.

[clm811]

I finally got the woofer and tweeter measured, and also have a second tweeter option that may be more suitable.
Here's the (6" Jamo)woofer data:

[clm811]

Here's the Dali Tweeter data:
(May not be good match)

[clm811]

Here's the data for the Dayton 1.1" silk dome, which may be a better match to the Jamo woofer(any help is appreciated):

[PeteMcK]

The Dayton seems to be the same sensitivity as the woofer, has ferrofluid (better damping), & a lower Fs, probably much easier to use than the Dali...
Do you have a frequency response plot for the Jamo - to help with choice of crossover frequency? - Otherwise go for an LR 2nd order xover at around 1.5-2 KHz, the Jamo's impedance rises fairly quickly, so a zobel is probably in order...

[clm811]

the Jamo's impedance rises fairly quickly, so a zobel is probably in order...

Any suggested values for Zobel?

With LR 2nd order crossover, must one invert the tweeter polarity connection for flat response?

TIA

-Chas

[sreten]

Originally Posted by clm811

I should clarify:

I have the Jamo crossover for the Jamo woofer, which gives a 2nd order low-pass rolloff at 3kHz...

I just need help with the high-pass for the substitution of this Vifa tweeter (impedance plot/link found here:
http://www.parts-express.com/pdf/279-175s.pdf

Thanks.

-Chas

Hi,

And this crossover does not include a treble section ?
Its the acoustic target at 3kHz that determines the tweeter
phase, not the electrical filter order, see Zaphs designs.

rgds, sreten.

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