Adding Tweeters to Cabs and Crossovers

[AsterL]

I am currently thinking about making a custom bass cab. I have a friend who is donating to me a Class-d sub (single 15 driver), which I have taking the low pass crossover out of.
I will be adding a 300 watt 4 ohm speaker to work with my soon to be ordered Eden Wtx 264. If I add a 8 ohm tweeter to the cab with a 8 ohm crossover, will the impedance still be 4 ohms? I have been reading this: [url="http://colomar.com/Shavano/crossover6db.html"]Crossovers[/url] and its a little bit confusing.

As well what frequency crossover should I use for the tweeter?

[icastle]

[quote name='AsterL' post='1331551' date='Aug 7 2011, 11:58 PM']I am currently thinking about making a custom bass cab. I have a friend who is donating to me a Class-d sub (single 15 driver), which I have taking the low pass crossover out of.
I will be adding a 300 watt 4 ohm speaker to work with my soon to be ordered Eden Wtx 264. If I add a 8 ohm tweeter to the cab with a 8 ohm crossover, will the impedance still be 4 ohms? I have been reading this: [url="http://colomar.com/Shavano/crossover6db.html"]Crossovers[/url] and its a little bit confusing.

As well what frequency crossover should I use for the tweeter?[/quote]

If you're using a piezo tweeter then you don't need a crossover (maybe just a couple of resistors to reduce the power going to the piezo).

If you're using a wire diaphragm type then the choice of crossover depends on the frequency response of the tweeter.

Can you give us a clue which tweeter(s) you're considering?

[AsterL]

[quote name='icastle' post='1331636' date='Aug 8 2011, 03:09 AM']If you're using a piezo tweeter then you don't need a crossover (maybe just a couple of resistors to reduce the power going to the piezo).

If you're using a wire diaphragm type then the choice of crossover depends on the frequency response of the tweeter.

Can you give us a clue which tweeter(s) you're considering?[/quote]


Most likely this if i use piezos; [url="http://www.bluearan.co.uk/index.php?id=SKT900207&browsemode=category"]http://www.bluearan.co.uk/index.php?id=SKT...semode=category[/url]
And this is i a regular one, [url="http://www.bluearan.co.uk/index.php?id=FANFPT150&browsemode=category"]http://www.bluearan.co.uk/index.php?id=FAN...semode=category[/url]

Whats the deal with wiring it as a bright box? (ie more than one tweeter)

[icastle]

[quote name='AsterL' post='1331723' date='Aug 8 2011, 09:28 AM']Most likely this if i use piezos; [url="http://www.bluearan.co.uk/index.php?id=SKT900207&browsemode=category"]http://www.bluearan.co.uk/index.php?id=SKT...semode=category[/url]
And this is i a regular one, [url="http://www.bluearan.co.uk/index.php?id=FANFPT150&browsemode=category"]http://www.bluearan.co.uk/index.php?id=FAN...semode=category[/url]

Whats the deal with wiring it as a bright box? (ie more than one tweeter)[/quote]

Well if you stick two of those piezo's in series that'll cope with the power and you won't need to worry about impedance or crossovers (piezo's aren't seen as a resistive load).

If you use the Fane FPT150 you're also going to need a 3.5KHz 2 way crossover and the resultant impedance of the cab is going to be 2.6Ω - so to get a 4Ω total load you'll need to use an 8Ω speaker.

Nothing to stop you putting more than one tweeter in a cab but the important question has to be whether you really need that amount of top end?