Hello!

First off, I do hope i'm in the right section of the forums to post this.

I've been researching and reading about DIY audio lately, and I'm making a DIY boombox!

My amplifier is a two channel amplifier with 30W+30W (total of 60W) of power, each channel has a full range speaker and now, I want a tweeter.

By my understanding, I need a high pass filter in-line with the tweeter. I used this site to calculate the values as well.
I wanted a first order high pass filter and it shows me a Capacitor only design. (http://www.the12volt.com/caraudio/cross.asp#hp)

However, some other websites how an Capacitor with Resistor (RC) HPF design.

I'm wondering now, if there is a difference? And which one should I pick for the tweeter?

 

The difference is one has an unnecessary extra component.

How to select cross-over components is described here:

http://www.introni.it/pdf/Hull (Philips) - Building HiFi Speaker Systems.pdf

 

The difference is one has an unnecessary extra component.

How to select cross-over components is described here:

http://www.introni.it/pdf/Hull (Philips) - Building HiFi Speaker Systems.pdf

To remove some confusion the first circuit has a resistor as well as the capacitor - the speaker is (roughly speaking) a resistor.

 

Very interesting PDF! Thank you very much!

I found it all from the Crossover chapter!

 

Can I ask another question? What Type of a capacitor would be good for this application?

I'm thinking of going for a Solen Polypropylene Axial Non-Polarized Capacitor.
http://www.ebay.com/itm/2x-Solen-5-...213659?hash=item33808f669b:g:iA8AAMXQTT9RyyTK
(I wonder if it's original though)

Is the 400V rating, a maximum? So it wouldn't be a problem right?
Is there a 'wattage' rating to a Capacitor?
I'm guessing, an AC (Alternating Current) Capacitor is a Non polarized capacitor?

Any decent, not so expensive capacitor brands that I can buy from eBay? I only know Solen (France) and Dayton.

 

To be honest, for this DIY project, I think Solen is a little bit expensive. Because of it's 400V rating which seems unnecessary?

 

Here's a supplier of various DIY audio parts.

 

Do some simple calculations.
What would be the signal voltage feeding 30W into 8Ω?
About 15Vrms. Hence even a 25V non-polar capacitor will be fine.

 

Here's a supplier of various DIY audio parts.

Thanks ! however, I do not live in the US, I reside in Dubai, UAE. So, i can do international shipping from eBay. But i'll look into the list of brands.

 

Thanks ! however, I do not live in the US, I reside in Dubai, UAE. So, i can do international shipping from eBay. But i'll look into the list of brands.

I didn't know that since you didn't post your location.

 

Apologies. The list should really help out though!

 

Hello,

You might also want to have a look at this article:
http://sound.whsites.net/lr-passive.htm

Bertus

 

For my stereo, both channels is in this configuration.

ONE CHANNEL Connection.

Speaker A = Full Range
Speaker B = Tweeter. (w/ Capacitor 5.6uF)

Total Imp = 2.66667 Ohms


IF My amplifier supports 4-8OHMS only, can i 'ADD' impedance?

 

For my stereo, both channels is in this configuration.

ONE CHANNEL Connection.

Speaker A = Full Range
Speaker B = Tweeter. (w/ Capacitor 5.6uF)

Total Imp = 2.66667 Ohms


IF My amplifier supports 4-8OHMS only, can i 'ADD' impedance?

No you don't want to add a resistance in series with the amp.
That reduces its power output and fouls up the damping factor.

How did you calculate an impedance of only 2.67 ohms?
What are the speaker impedances?

For a proper crossover you should also have an inductor in series with the large speaker to roll off the high frequencies that go to the tweeter (and also increase its high frequency impedance).

 

Sorry, I thought I added the file to the reply.

 

Consider whether speaker impedance changes as the frequency changes.