Crossovers - where to start? - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 157 Old 01-01-13, 03:28 AM Thread Starter
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Crossovers - where to start?

Hey all & Happy New Year!

In the pic is a TB W5-1611SAF, full range; however the high end is very week.

Getting good robust sound, bass/mid and would like to add tweeter to brighten them up.

The TB woofer is 8ohm-90db and have some MDT-28s, 8ohm-91db. (could order new tweeters)

I see there a host of on line calculators - this one almost seems to easy:

http://www.diyaudioandvideo.com/Calculator/XOver/

Never had much luck with xo design, but lots of caps/coils here - where to start?

I'm assuming the TB is going to need a 12db slope, since it's a full range.

Thanks in advance for any advise!
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Last edited by Odougbo; 01-03-13 at 11:27 AM.
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post #2 of 157 Old 01-01-13, 03:44 AM
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Re: Crossovers - where to start?

They are a close match in sensitivity. Do you have the specs for the 28s. I looked online but could not find them.

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post #3 of 157 Old 01-01-13, 03:54 AM Thread Starter
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Re: Crossovers - where to start?

Sorry no specs on the Morel - I did look from them also...nada.

Which is hard to believe, must be a million of them out there.

Thanks

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post #4 of 157 Old 01-01-13, 04:26 AM Thread Starter
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Re: Crossovers - where to start?

No luck on the Morel (again).

I'd order a new set - PE has 100+ tweeters:
http://www.parts-express.com/cat/tweeters/17

Where would be a good xo point to start? 4,000?


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Odougbo wrote: View Post
Sorry no specs on the Morel - I did look from them also...nada.

Which is hard to believe, must be a million of them out there.

Thanks

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Last edited by Odougbo; 01-01-13 at 04:31 AM.
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post #5 of 157 Old 01-01-13, 04:32 AM
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Re: Crossovers - where to start?

Since the other driver is full range then that would be reasonable, along with the fact that the 29 has a stated response of Frequency response: 1,800-20,000 Hz. So you could, theoretically, use a first order crossover at 3,600 Hz.

Assuming (rightly or wrongly) that the 28s has similar specs then a second or third order crossover at 4kHz would fit nicely.

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post #6 of 157 Old 01-01-13, 04:59 AM Thread Starter
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Re: Crossovers - where to start?

Thinking out loud here - I do have a pair of Vifa's that I never used.

D27TG-05-06 Specs are easy to find:
http://www.parts-express.com/pdf/264-524.pdf
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Last edited by Odougbo; 01-01-13 at 05:06 AM. Reason: http://www.parts-express.com/pdf/264-524.pdf
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post #7 of 157 Old 01-01-13, 05:14 AM
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Re: Crossovers - where to start?

They should be good also.
Looking at their graph you could cross them at 2.5kHz and above with any order crossover.
Again 4kHz is fine.

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post #8 of 157 Old 01-01-13, 06:07 AM Thread Starter
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Re: Crossovers - where to start?

The vifa tweeter (link) has a 6 component xo - is Fc[HZ] the xo - 3,500hz?

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post #9 of 157 Old 01-01-13, 09:47 AM Thread Starter
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Re: Crossovers - where to start?

I did piece together a xo - it's a little scary

I used the tweeter xo from the PDF for the vifa tweeter.

The woofer I tried different coils/caps using the 2nd order Butterwoth 2200hz.

I think the tweeter is a bit "louder" than woofer,,,btw.

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post #10 of 157 Old 01-01-13, 02:57 PM Thread Starter
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Re: Crossovers - where to start?

update:

Added 4R @ Vifa tweeter (whew) The tweeter is a bit harsh, but better with attenuation.

The xo point is 2200 - easy to hear that.

They are sounding okay...some imaging.

I guess I could upgrade the parts, e.g. using small iron core bobbin(s) for tweeter.
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