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Old 13th October 2009, 12:56 AM   #1
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Default Adding a Supertweeter....

I have this:

A TW consisting of a Peerless SDS-164-THP (830657) and a Hivi research X1-A. Crossover:Click the image to open in full size.

I want badly to add a supertweeter. The X-1A is a nice tweeter but it's just not punching up in to that "sparkle zone" I want to hear.

How can I wire this up? Especially with a minimum to no(?) changing the existing x.o. in the box? What's the best (cheap) supertweeter? I intend to mount it in a separate small enclosure sitting on top of the main cabs.
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Old 13th October 2009, 01:30 AM   #2
tinitus is offline tinitus  Europe
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Vifa XT19 is sweet, highest quality and affordable
Vifa XT19TD00-04 3/4" Ring Radiator Tweeter from Madisound
Just mount a small cap on XT19 terminal
+ or - ? I dont know
You may need a small series resistor
Mounted between cap and tweeter it makes the cap bigger, sort of
Within limits you may be able to fine adjust rolloff and precense with this resistor

Maybe try it as OMNI, which means the tweeter plays upwards
Or try it back mounted

Just wire it all to speaker main terminals

Or you can try to connect it directly to main tweeter terminals, but may need a resistor in between, but could be more tricky, dont know

edit, another one http://www.parts-express.com/pe/show...number=264-735

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Last edited by tinitus; 13th October 2009 at 01:50 AM.
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Old 13th October 2009, 05:59 AM   #3
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So the cap on the xt19 terminal... series or parallel? I'm guessing it's parallel? then the series resistor between the cap and the tweeter on the pos lead?

What's a good ballpark for resistor value so I know what scale of pot to buy? I'm assuming after I know approx R value I can buy a linear pot to find my fine tuning? This totally bypasses the existing crossover??
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Old 13th October 2009, 06:09 AM   #4
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Cap in series,not parallel.
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Old 13th October 2009, 06:10 AM   #5
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The small value cap (1uf) should be in series (1st order) with the super tweeter. However, the result may sound super bright so you have to use the t-pad to match the impedance of the existing speaker.
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Old 13th October 2009, 06:16 AM   #6
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Here is the clue for the L-pad

Crossover Design Calculators
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Old 13th October 2009, 04:48 PM   #7
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So do the attenuating resistors go before or after the cap?
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Old 13th October 2009, 05:41 PM   #8
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by raypalmer View Post
So do the attenuating resistors go before or after the cap?
Depends
Some use a series resistor on both sides of cap
I wouldnt use traditional L-pad with paralel resistor
Just use series resistor only

1. Resistor between cap and tweeter makes the cap seem bigger, meaning rolloff will be lower than wiithout the resistor
Higher impedance results in smaller cap fore the sam xo point
Meaning that when increasing tweeter impedance with a series resistor results in slightly lower xo point fore a fixed cap value
Theres both pros and cons doing that

2. The series resistor before the series cap is easier to change value without effecting series cap as much

3. All in all this means that with the first resistor you can change attenuation only
And with the resistor after series cap you can fine adjust both capacitor, AND attenuation

I have doubts about second attached xo
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Last edited by tinitus; 13th October 2009 at 05:59 PM.
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Old 13th October 2009, 09:44 PM   #9
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Quote:
Originally Posted by tinitus View Post
Depends
Some use a series resistor on both sides of cap
I wouldnt use traditional L-pad with paralel resistor
Just use series resistor only

1. Resistor between cap and tweeter makes the cap seem bigger, meaning rolloff will be lower than wiithout the resistor
Higher impedance results in smaller cap fore the sam xo point
Meaning that when increasing tweeter impedance with a series resistor results in slightly lower xo point fore a fixed cap value
Theres both pros and cons doing that

2. The series resistor before the series cap is easier to change value without effecting series cap as much

3. All in all this means that with the first resistor you can change attenuation only
And with the resistor after series cap you can fine adjust both capacitor, AND attenuation

I have doubts about second attached xo


Excellent tinitus, thanks so much. What do you think my starting values for the resistors should be?
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Old 13th October 2009, 09:54 PM   #10
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Quote:
Originally Posted by tinitus View Post
Depends
Some use a series resistor on both sides of cap
I wouldnt use traditional L-pad with paralel resistor
Just use series resistor only

1. Resistor between cap and tweeter makes the cap seem bigger, meaning rolloff will be lower than wiithout the resistor
Higher impedance results in smaller cap fore the sam xo point
Meaning that when increasing tweeter impedance with a series resistor results in slightly lower xo point fore a fixed cap value
Theres both pros and cons doing that

2. The series resistor before the series cap is easier to change value without effecting series cap as much

3. All in all this means that with the first resistor you can change attenuation only
And with the resistor after series cap you can fine adjust both capacitor, AND attenuation

I have doubts about second attached xo


Excellent tinitus, thanks so much. What do you think my starting values for the resistors should be?



Also what about this one?
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