Crossover frequency vs speaker power requirements

[Bazukaz]

Hi,

Started making a big three way system some time ago and was curious how much power does mid/tweeter actually need to handle.
Searches over this forum and net suggest about 50/50 distribution at about 500 Hz for classical music.
So I have decided to measure myself using power resistors and checking how hot they get.
Test was made by changing power levels to different channels until equilibrium temperature was the same at both resistors(about 55-60 C)

Test setup :

LM3886 DIY power amp
MiniDSP processor
5W Wire wound resistors.
Music - heavy metal(Amon Amarth)
Filter : LR 24 dB/Oct

Results, power low:high at cut off :

1:3.5 at 300 Hz
1:5 at 400 Hz
1:7 at 500 Hz
1:10 at 600 Hz

This suggests that power handling should not be an isssue for small mid range drivers even with big and powerful woofers with cutt of at 500 Hz or so.
Anyone interested in confirming this test ?

Regards,
Lukas.

 

[AllenB]

@Pano has done some work in this area.

 

[Sonce]

Test was made by changing power levels to different channels until equilibrium temperature was the same at both resistors(about 55-60 C)

Nice!
Is the signal converted to mono, so both left and right channels have the same audio content prior to filtering?
Could you try with 200 Hz, 150 Hz and 100 Hz, please?
Could you try with some other rock content, please?

 

[Sonce]

@Pano has done some work in this area.

Link, please? I tried the Search, but...

 

[Pano]

I’ll see if I can find the thread.

 

[Cask05]

See the JAES article here (figures 7-8 in particular).

I believe there is a relevant thread from Pano here,

Chris

 

[Pano]

Here it is, maybe it will help you.
https://www.diyaudio.com/community/threads/spectrum-of-musical-genres.310900/

I think your test is an interesting idea

 

[Sonce]

Thanks, much appreciated!