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Multi-Way Conventional loudspeakers with crossovers

First project
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Old 22nd July 2018, 05:58 AM   #1
ShadySocks is offline ShadySocks  United States
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Default First project

I am new to diyAudio and would like to start my first project. I have completed planning my speaker, but I would like someone to look it over. I know that I will make mistakes, and I am not afraid to scrap everything and restart. Here are my plans

Edit: I remade the crossover without the L-Pad on the woofer, then posted it later on this thread

Thanks!
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Last edited by ShadySocks; 24th July 2018 at 03:29 PM.
 
Old 22nd July 2018, 06:25 AM   #2
picowallspeaker is offline picowallspeaker  Italy
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No, no, no... forget that 50 W L-pad before the woofer.
Nobody has ever put one...so it's not a good idea.
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Old 23rd July 2018, 01:22 AM   #3
PRR is offline PRR  United States
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I do not understand the small resistor pads. They cut both drivers about the same (so why do it?), and cut the system impedance near half (so double the amplifier power for the same air-shake).
 
Old 24th July 2018, 12:31 AM   #4
ShadySocks is offline ShadySocks  United States
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Quote:
Originally Posted by PRR View Post
I do not understand the small resistor pads. They cut both drivers about the same (so why do it?), and cut the system impedance near half (so double the amplifier power for the same air-shake).
Those are L-Pads.
 
Old 24th July 2018, 12:48 AM   #5
Cal Weldon is offline Cal Weldon  Canada
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First project
Yes, we know what they are. You have a lot of very smart people here so please make sure you soak in the info. The question was why do you have the two L-pads there at all?
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Old 24th July 2018, 05:59 AM   #6
ShadySocks is offline ShadySocks  United States
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Quote:
Originally Posted by PRR
I do not understand the small resistor pads. They cut both drivers about the same (so why do it?), and cut the system impedance near half (so double the amplifier power for the same air-shake).
Quote:
Originally Posted by picowallspeaker
No, no, no... forget that 50 W L-pad before the woofer.
Nobody has ever put one...so it's not a good idea.
Quote:
Originally Posted by Cal Weldon
Yes, we know what they are. You have a lot of very smart people here so please make sure you soak in the info. The question was why do you have the two L-pads there at all?
My bad. I put two pads because adding one screwed up the frequency response. I revised the crossover. How is it now?

Click the image to open in full size.
 
Old 24th July 2018, 08:12 AM   #7
Qts is offline Qts
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I would recommend two channel measurement equipment and good measurement program like ARTA. You have much better chance to succeed with good data from proper measurements.
 
Old 24th July 2018, 08:55 AM   #8
Borus is offline Borus  United States
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Why 4ohm tweeter? Why electrolytic cap? Why Lpad on woofer? All these can work just don't understand your reasoning.
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Old 24th July 2018, 09:14 AM   #9
wintermute is offline wintermute  Australia
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You at least now have the tweeter lpad in the right place (ie between the tweeter and the crossover) if before the crossover it will work, but it will cause an impedance dip on the woofer at lower frequencies, and unnecessarily load the amp (I'm guilty of having done the same).

But the values in your lpad seem odd, and your tweeter response is dropping an awful lot... do you even need the lpad on the tweeter as PRR mentioned?

Tony.
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Old 24th July 2018, 03:13 PM   #10
ShadySocks is offline ShadySocks  United States
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Quote:
Originally Posted by wintermute View Post
You at least now have the tweeter lpad in the right place (ie between the tweeter and the crossover) if before the crossover it will work, but it will cause an impedance dip on the woofer at lower frequencies, and unnecessarily load the amp (I'm guilty of having done the same).

But the values in your lpad seem odd, and your tweeter response is dropping an awful lot... do you even need the lpad on the tweeter as PRR mentioned?

Tony.
I didn't really know what values to put into the L-Pad. I want the L-Pad on the tweeter in case the specifications are off. Also, I want the L-Pad because my receiver only has a clunky 2 band equalizer, and I have no idea what frequencies it is adjusting.
 

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