Hi Guys! I am new here.. I need advise from those experts out there with my speaker plan. I am trying to make a loud speaker for outdoor/full band application. I need advise with regards to speak wiring and load distribution. Below are my gears:
1200w @ 8ohms/ 2400w @ 4ohms amplifier per channel
8 pcs 10" instrumental speakers, 8ohms, 93dB sensitivity. 50Hz - 15KHz freq. response ( to be used in 1 channel)
Note: I will wire the speakers using series/parallel method to achieve a total load of 4ohms
Question: If I will add a tweeter and let's say two 8ohms compression driver unit wired in series which will give me a total of 16ohms load and i will use a 5.0uF capacitor to set the Crossover frequency to 2000Hz, what will be its effect to the load? will it add up and change the total speaker load to 3.2ohms or will it remain at 4ohms? Do i need to reduce the number of the woofers to 6 to give way for the 2 tweeters or can i put more tweeter on the plan? I want the 10" to be on full range.
Please advise..
1200w @ 8ohms/ 2400w @ 4ohms amplifier per channel
8 pcs 10" instrumental speakers, 8ohms, 93dB sensitivity. 50Hz - 15KHz freq. response ( to be used in 1 channel)
Note: I will wire the speakers using series/parallel method to achieve a total load of 4ohms
Question: If I will add a tweeter and let's say two 8ohms compression driver unit wired in series which will give me a total of 16ohms load and i will use a 5.0uF capacitor to set the Crossover frequency to 2000Hz, what will be its effect to the load? will it add up and change the total speaker load to 3.2ohms or will it remain at 4ohms? Do i need to reduce the number of the woofers to 6 to give way for the 2 tweeters or can i put more tweeter on the plan? I want the 10" to be on full range.
Please advise..
I'd advise using a steeper crossover than just a capacitor - the compression drivers will be receiving plenty of power at <1kHz, which will cause them to get very warm.
That said...
Above the crossover frequency, the impedance will be around 3.2ohm as you say, but below the crossover frequency, the compression drivers are effectively taken out of the circuit, so it will be 4ohm impedance again.
I'd expect your amplifier to be fine with the 3.2ohm load, as its in the high frequencies where current demands are small.
Chris
That said...
Above the crossover frequency, the impedance will be around 3.2ohm as you say, but below the crossover frequency, the compression drivers are effectively taken out of the circuit, so it will be 4ohm impedance again.
I'd expect your amplifier to be fine with the 3.2ohm load, as its in the high frequencies where current demands are small.
Chris
Thanks Chris.. Will it affect the freq response of my 10" speakers? how many tweeters can i add?
Can you suggest a better crossover circuit for this?
Can you suggest a better crossover circuit for this?
If you do the crossover correctly (low pass on the woofers and highpass on the tweeters), the load as seen by the amps will be fine. They wouldn't add to each other since they are confined to separate frequencies. Are the compression drivers additional tweeters or midrange drivers? With those power levels it would be absurd to not use an active crossover ahead of the poweramps. Not enough info to tell you more. Hope this helps.
Hi Bob,
The additional compression drivers will serve as tweeter. the 10" got a decent high pitch response but still not enough compared to a high pitch sound produced by a tweeter.
Thanks,
The additional compression drivers will serve as tweeter. the 10" got a decent high pitch response but still not enough compared to a high pitch sound produced by a tweeter.
Thanks,
Because the tweeters are wired in parallel to the woofers, the woofers will do the same as if the tweeters weren't there.
This will help you find some crossover values:
Passive Crossovers, Capacitor and Coil Calculator
... and here's an article that goes into a lot of detail about passive crossovers.
Passive Crossover Network Design
I would avoid adding many tweeters. The reason is that, at high frequencies, the wavelengths are very short. So if you have a few different sources of HF, they might cancel each other out because of the distance changes between them and you.
IMO, one powerful compression driver is much better than several bad ones.
Chris
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