Probably a silly question but I am not a speaker guy so here goes. I want to add a rear firing super tweeter to an Altec 755c full range. The impedance of the 755c is close to 16 Ohm at 10K and that is where I want to bring in the tweeter. Is it better to use a 16 ohm Lpad and a 16 ohm tweeter or 8 ohm for each?
Thanks in advance
Marty
Thanks in advance
Marty
You will need to include a series capacitor to act as a high pass filter for the tweeter.
The capacitor's impedance at the crossover frequency will add to that of the tweeter.
For example, the impedance of a 1.5 uF capacitor at 10,000 Hz is just over 10 ohm,
You can use a 1.5 uF polypropylene capacitor, an 8 ohm tweeter and an 8 ohm L pad.
The capacitor's impedance at the crossover frequency will add to that of the tweeter.
For example, the impedance of a 1.5 uF capacitor at 10,000 Hz is just over 10 ohm,
You can use a 1.5 uF polypropylene capacitor, an 8 ohm tweeter and an 8 ohm L pad.
I wouldn’t even bother with an L pad unless you mean a variable. A single resistor is what I’d use along with the small cap.
As a non-coherent source, I was thinking of crossing the rear-firing tweeter at the half-power point... but I see what you did there 😉
Following on to your question... Can I assume that the reason for the rear-firing tweeter would be to add some high end balance to the reverberant sound? If so, you may want to consider crossing to the tweeter at a lower frequency - maybe 5-7 KHz, depending upon where your 755 starts to beam. And consider angling it upward by maybe 20 to 30 degrees, to get more of those upper frequencies bouncing upward off the front wall instead of into the carpet (if you have carpet or a large rug).
I hope this is useful.