Crossover Notes on Two Way

This Section Last Updated: 1-27-2005

After making the woofer and tweeter response it is time to load them into SE to start working on the crossover. I am aiming for a 4th order LR.

To help in decideing the crossover point i measured the woofers off axis response. The following image contains 0, 15, 30 and 45 degree off axis responses. The 45 degree response is 6 dB down at 4k Hz. I decided to make my crossover point just a little lower. So i went with 3.5k Hz.

You can see the first part of the problem if you can call it that. It is a 5.5 inch driver up against a 1 inch tweeter. The woofer is 10 dB down from the tweeter.

Now that the woofer is smoothed out to a 4th Order LR it is time too work on the tweeter.

With a little coaxing here is what i came up with. I had to crank up the resistors to bring the tweeter down to the woofers level. It is about a $25 crossover if you use 18 gauge inductors.

I have too say it is not bad for a $15 driver and $20 tweeter. There is only a 3dB variation.

After looking at the response again and remembering the last crossover i built. I decided to remove L9 R10 and replace it with an inductor. This way i could lower the level of the tweeter.

I feel the tweeter will be too strong if you keep it on the same dB level as the woofer. So here is crossover design number 2. I am going too go ahead and order the parts for this one and tweak see how it sounds.

After building the crossovers for the two ways i must say WOW! The speakers turned out very nice.

They have an excellent smooth response through out the spectrum and dont have any weeknesses that i can pick out yet. More critical listen will need to happen but i think this cross over setup for these drivers is great.

The only downside is the effeciency of these speakers. I am betting the 4ohm driver will prove to be a better candidate for a two driver configuration. BUT for surround speakers i think these 8ohm drivers will do just fine.

As you can see from the waterfall plot everything dies down pretty evenly. The tweeter looses steam around 1.4 ms and the woofer around 3 ms. There are no major peaks or ringing.

Project Sections:
Silver Flute Home Theater System
1. Box Building
2. Near Field Measurments of Two Way
3. Near and Far Measurements of Two Way
4. Crossover Notes on Two Way
5. MTM Design
6. Final Listening Notes

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