Jst trying to understand something

[kvar14 10+ year member]

Im gonna go alittle off the car stereo topic (while it still kinda is when looking at it from component speakers viewpoint) but anyways heres my question- Lets say im looking to make a pa now ive got a 500w 6-8 ohm stable amp. great. now this would be a 2 speakers setup, one mid-low range 400watt rms speaker and (now this is where i dont fully grasp the concepts here) about a 150esk rms supertweeter for a horn. now how is power distributed through these, how should they be wired, what impedence should the tweeter be, and why doesnt the tweeter get ***** by the wattage being fired into it like it looks like it would be??

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[jdawg 5,000+ posts]

how many channel amp? 2? then you have to use a passive crossover

 

[kvar14 10+ year member]

lets say two but is the crossover the 1 keeping the watteage going to the tweeter low?? so they just sorta balance out and if so how can you tell if its a match pair like if youve got a 400 watt rms woofer and a 20 watt tweeter

 

[jdawg 5,000+ posts]

no it distributes the frequencies, you have no way to control the wattage

 

[kvar14 10+ year member]

so does that mean the max wattage you can input is governed by the lowest wattage speaker? or do you say get an 8 ohm tweeter and 6 ohm woofer to sorta balance out...i just dont get how the tweeter doesnt get killed trying to keep up with the woofer

 

[jdawg 5,000+ posts]

most of the power is sucked up by the woofer, the crossover keeps the bass out of the tweeter, i wouldnt recommend a 400w woofer and a 20w tweeter together, unless you are using a 20w per channel amp

 

[kvar14 10+ year member]

almost seems like crossovers made for pas do control output to the tweeters

Eminence pxb board-only crossovers are a lower cost alternative to the "cabinet ready" models and are targeted specifically for custom cabinet projects as they do not include the terminal cup, input connectors or L-pad found on the "cabinet ready" models. They feature advanced circuit design to both preserve the crossover and your drivers. A benefit of the design is to form a voltage divider across the high frequency driver. The high-pass protection uses custom-built aerospace lamps. The tungsten filaments effectively track the program material, dynamically maintaining a safe maximum current level to the high frequency driver without introducing distortion. This circuitry provides smooth 3:1 analog compression during input overload conditions over 250 watts RMS. At full drive level approaching clipping, the electrical attenuation to the protected high frequency driver is -4.5 dB. In every way, Eminence pxb crossovers are a technically superior product. For use with 8 ohm drivers.

 

[jdawg 5,000+ posts]

they aernt really made to control the amount of power going to a low power tweeter to save it from blowing, they are made more for level adjustment

 

[smoka 10+ year member]

Many crossovers (not car audio) have L-pads built in to adjust the output of the tweeter. It will limit the power to the tweeter (as long as the L-pad is rated for the power).

Here is an example of one rated to 100W:

http://www.parts-express.com/pe/showdetl.cfm?Partnumber=260-265

 

[x1le 10+ year member]

If you want to control the power going to the tweeter separately from the woofer you could wire them up to a separate channel on the amp and then adjust gains to your liking.

 

[kvar14 10+ year member]

that 20 watt tweeter was just an extreme example, but what would you guys say would be a good speaker-loudspeker setup for a pa

 

[smoka 10+ year member]

http://www.mcmelectronics.com/browse/Speakers/3829813

 

[jdawg 5,000+ posts]

premade or put together? best bet is to build a nice set a 3 ways on a 2 channel, or do a set of 3 ways on with a smaller woofer like a 10 and build a sub cabinet and use another amp

 

[jdawg 5,000+ posts]

http://www.parts-express.com/projectshowcase/indexn.cfm?project=Blue

 

[kvar14 10+ year member]

did i ever tell you i love you jdawg