Adding a Tweeter

[Ginge]

Hi All,

Just joined and learning at speed. Question on the electronic side of things. Adding a tweeter to enhance the air in the soundstage. What is the best way to attenuate or match a 87db sensitivity tweeter with a 98db fostek 203.

Cheers

[lduarte1973]

why dont you go for a higher sensivity tweeter ? any "normal" 91/92db tweeter should work fine without atenuation of the full range

if you want higher sensivity 94db , even 96db ( check the vifa BC25SC-06/04)

http://www.europe-audio.com/Producte...tgroep_A_ID=67

[url]http://www.europe-audio.com/Producten_c.asp?Productgroep_B_ID=649&Productgroep _A_ID=67[/url

you can always use a Lpad too

[Ginge]

Hi Induate.
Thanks. I have a particular tweeter i want to try. This is my first speaker build. I have assumed that the sensitivity of the two speakers would need to be within a few db of each other for volume reasons. Not thinking of bi-amping at this stage.

Cheers

[Cal Weldon]

Try a 1.5 mfd cap.

[Ginge]

Cal.
Not with you here. Adding cap to tweeter will filter frequency arriving at the tweeter but will it also increase volume ? I thought a resistor to the more efficient ( Louder in comparison to the tweeter for a given signal strength ) allrange would be what is required.

Cheers

[Cal Weldon]

You are looking to add some sparkle to the top end. You can't do anything about increasing the tweeter volume and you shouldn't do anything about decreasing the sensitivity of the FR. Add a 1.5 cap and see how you like it. It costs you but a few dollars to know if you are on the right track if you use NP electrolytic caps.

Cheers.

[planet10]

Originally Posted by Ginge

Hi All,

Just joined and learning at speed. Question on the electronic side of things. Adding a tweeter to enhance the air in the soundstage. What is the best way to attenuate or match a 87db sensitivity tweeter with a 98db fostex 203.

Cheers

You are talking about the FE203eSR Limited Edition?



If you want to add a tweeter passively, you need to get one that is more efficeit.

The only way you can make an 87 dB tweeter work is to biamp.

The budget option Fostex FT96H Horn Super Tweeter: Madisound Speaker Store



cheapest top mount (they go way up in price from there)

Fostex T90A Top Mount Horn Super Tweeter: Madisound Speaker Store



dave

[Ginge]

Hi,

Thanks for the replies. Okay got the picture. Carl how would you wire the cap ? And quickly Dave where is the best place (s) in Melb for obtaining quality bits for building speakers crossovers etc.

Cheers

[chrisb]

Originally Posted by Ginge

Hi,

Thanks for the replies. Okay got the picture. Carl how would you wire the cap ? And quickly Dave where is the best place (s) in Melb for obtaining quality bits for building speakers crossovers etc.

Cheers

As Cal implied earlier, the simplest way to taste test a passive add-on like this is a cap in series with the + input to tweeter, the value of which is determined by a formula that includes impedance of both drivers, and the desired XO frequency.

If both drivers were 8ohms (and approx same sensitivity) 1.5mF would give you a point in the region of 13500Hz - to calculate for different frequencies, use an on-line applet such as:

2-Way Crossover Designer / Calculator

[Boscoe]

The cap needs to go in series with the tweeter.