I have a two way set of speakers that need 5db attenuation to balance the speakers.
8ohms
50w
Tweeter = 95db
Woofer = 90db
According to the online line calculator I have been using here L-Pad (Driver Attenuation Circuit) Designer / Calculator
Then I get R1=3.5 ohms @ 21.88watts
R2 =10.28 ohms @ 10.28 watts.
5w & 10w resistors are available from a limited source, but the question here is what would be the best way to approach the contruction for this Lpad.
Do we really need more than a 10watt resistor or can we use a combination.Bear with me here as I'm still a noob when it comes to design and build for crossovers.
8ohms
50w
Tweeter = 95db
Woofer = 90db
According to the online line calculator I have been using here L-Pad (Driver Attenuation Circuit) Designer / Calculator
Then I get R1=3.5 ohms @ 21.88watts
R2 =10.28 ohms @ 10.28 watts.
5w & 10w resistors are available from a limited source, but the question here is what would be the best way to approach the contruction for this Lpad.
Do we really need more than a 10watt resistor or can we use a combination.Bear with me here as I'm still a noob when it comes to design and build for crossovers.
But what if I knew that the tweeter is going to be driver at 15w?
then 22w and 13w resistor would be used is this true?
Because then the power input for the tweeter after crossover is being used- before the l pad- is going to be 50W
just theoretically
According to the Calculator
whan do you think?
then 22w and 13w resistor would be used is this true?
Because then the power input for the tweeter after crossover is being used- before the l pad- is going to be 50W
just theoretically
According to the Calculator
whan do you think?
Yes, the higher power resistors are not much higher in price and only a little larger,
so I'd use those anyway.
so I'd use those anyway.
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I Am asking this because sometime I need to get a CD down by 10db . I have put 6 10w resistors and 2 10w for an lpad in a PA 12"+1"CD arrangement in the end I have to have the driver output say 10w or 5w maximum.
but by using this calculator that is what you have to use not to burn down your cabs.
I was just wondering if this is right?
but by using this calculator that is what you have to use not to burn down your cabs.
I was just wondering if this is right?
Probably so, but you'd have to decide on all the specific numbers and calculate.
Bear in mind that the acoustical treble output is generally lower than bass/mid output
to start with except for very specific types of music, but you are looking at the worst case.
If you have 50W input and 10dB loss, much of the power will be dissipated in the L pad series resistor,
so I'd use three 20W or six 10W paralleled parts for that one. The shunt resistor will take much of the rest,
so maybe three 10W paralleled parts there. Double all of the power ratings for heavy, sustained use.
Consider mounting the resistors externally for better ventilation.
Bear in mind that the acoustical treble output is generally lower than bass/mid output
to start with except for very specific types of music, but you are looking at the worst case.
If you have 50W input and 10dB loss, much of the power will be dissipated in the L pad series resistor,
so I'd use three 20W or six 10W paralleled parts for that one. The shunt resistor will take much of the rest,
so maybe three 10W paralleled parts there. Double all of the power ratings for heavy, sustained use.
Consider mounting the resistors externally for better ventilation.
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Thanks ,then everything is correct
I used to do a test- I took a dsp, set the crossover settings, put various types of music through it and looked at limiter level, simultaniously adjusting the treshold. For the heavyest metal and d'n'b tracks for a two way speaker configuration and a crossover setting of 2,5kHz the result was for examle 400Watts for a woofer and 60 watts for a tweeter. That is if we take that all sensitivity is the same for every speaker. From there I could calculate the rest.
I used to do a test- I took a dsp, set the crossover settings, put various types of music through it and looked at limiter level, simultaniously adjusting the treshold. For the heavyest metal and d'n'b tracks for a two way speaker configuration and a crossover setting of 2,5kHz the result was for examle 400Watts for a woofer and 60 watts for a tweeter. That is if we take that all sensitivity is the same for every speaker. From there I could calculate the rest.
That seems very reasonable. Don't know what tweeter could take 60W though.
But a bad cable, oscillation, etc. can put full power into the tweeter,
so the worst case should be assumed so you don't have to replace tweeters.
But a bad cable, oscillation, etc. can put full power into the tweeter,
so the worst case should be assumed so you don't have to replace tweeters.
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