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View Full Version : New towers. Final impedance questions??



havoc97
02-07-2012, 01:44 PM
Building a new set of towers currently and have a few questions I can't seem to figure out about the impedance after the crossover.

Here is the setup:

ID CD1E Horns (4 ohms)
Focal 6.5 Mids (4 ohms)
Tang band w6-1139sg subs (4 ohms)

(Odd selection of equipment, but had it laying around and figured might as well use it up)

I was thinking of running a three way passive xover, and running a behringer A500 amplifier with these specs:

Output power (RMS, 1 kHz @ 1% THD): Stereo mode (both channels driven): 125 watts RMS x 2 @ 8 ohms, 185 watts RMS x 2 @ 4 ohms; Bridged mono: 375 watts RMS x 1 @ 8 ohms Output power (peak power, 1 kHz): Stereo mode (both channels driven): 175 watts x 2 @ 8 ohms, 300 watts x 2 @ 4 ohms; Bridged mono: 600 watts x 1 @ 8 ohms Weight: 18.5 lbs. Dimensions: 4" H x 19" W x 10.85" D.

Question is, what will my final impedance that the amplifier sees once those speakers pass thru the crossover?

From what I understand the amp will see 4 ohms for each frequency range, but I'm not sure if that is right.

Here is a tower preview pic
http://i99.photobucket.com/albums/l318/havoc97/towers.jpg

duanebro
02-11-2012, 12:08 AM
it depends on the xo. You could have a short depending in the xo you build. (not likely, but it could happen.) You will most likely end up around 4 ohms. How are you designing the xo?

havoc97
02-14-2012, 06:25 PM
honestly i was planning on using on of the dayton audio xo's off parts express. Havent ever designed/built a xo so wouldnt know where to start.

Plan on using a 500/4000hz 3 way.

wenn_du_weinst
02-14-2012, 06:27 PM
using a prebuilt xover is like using a prefab enclosure.
You really need to have one designed properly for it to work well.

duanebro
02-15-2012, 01:46 PM
Building a new set of towers currently and have a few questions I can't seem to figure out about the impedance after the crossover.

Here is the setup:

ID CD1E Horns (4 ohms)
Focal 6.5 Mids (4 ohms)
Tang band w6-1139sg subs (4 ohms)

(Odd selection of equipment, but had it laying around and figured might as well use it up)

I was thinking of running a three way passive xover, and running a behringer A500 amplifier with these specs:

Output power (RMS, 1 kHz @ 1% THD): Stereo mode (both channels driven): 125 watts RMS x 2 @ 8 ohms, 185 watts RMS x 2 @ 4 ohms; Bridged mono: 375 watts RMS x 1 @ 8 ohms Output power (peak power, 1 kHz): Stereo mode (both channels driven): 175 watts x 2 @ 8 ohms, 300 watts x 2 @ 4 ohms; Bridged mono: 600 watts x 1 @ 8 ohms Weight: 18.5 lbs. Dimensions: 4" H x 19" W x 10.85" D.

Question is, what will my final impedance that the amplifier sees once those speakers pass thru the crossover?

From what I understand the amp will see 4 ohms for each frequency range, but I'm not sure if that is right.

Here is a tower preview pic
http://i99.photobucket.com/albums/l318/havoc97/towers.jpg

If I am looking at this right you are planning on using the horn on its side? you do know that horns have a controlled output pattern. So you will have to aim them right at you to hear them and they will reflect off the floor and ceiling. I really think you should rethink your design. Also what is your frequency response of the drivers? what is the efficiency for the drivers?

keep_hope_alive
02-19-2012, 02:27 PM
If I am looking at this right you are planning on using the horn on its side? you do know that horns have a controlled output pattern. So you will have to aim them right at you to hear them and they will reflect off the floor and ceiling. I really think you should rethink your design. Also what is your frequency response of the drivers? what is the efficiency for the drivers?

i saw the same thing. cant do that. buy a new waveguide from parts express that gives a 60x40 dispersion. 60deg is is horizontal or a spherical. note that the horn waveguide determines the lower frequency range for which the horn is controlling dispersion.

premade crossovers can work, but you don't want to use them. you want the mid to play a wider range, like 200Hz - 4kHz