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Passive crossover attenuators |
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Risc_Terilia 
Young Croc 
Joined: 15 December 2007 Status: Offline Points: 699 |
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 Topic: Passive crossover attenuatorsPosted: 30 May 2017 at 3:05pm |
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I've just bought this from Blue Aran. Will this crossover give less power to the high pass output or will it just do equal split? Both drivers are 8 Ohm. I see there's space for resistors. Cheers! 
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BJtheDJ
Young Croc
Joined: 28 November 2012 Location: Bristol Status: Offline Points: 886 |
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Posted: 30 May 2017 at 3:20pm |
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Have you tried asking Blue Aran?? Seems logical to me.
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It's a difficult choice, would you rather have:
A: A vegan son. B: An OnlyFans daughter |
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Risc_Terilia
Young Croc
Joined: 15 December 2007 Status: Offline Points: 699 |
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Posted: 30 May 2017 at 3:30pm |
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Yeah could do but I'd also like to gain an understanding of how to work it out.
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odc04r
Old Croc 
Joined: 12 July 2006 Location: Sarfampton Status: Offline Points: 5482 |
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Posted: 30 May 2017 at 4:23pm |
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Get LTSpice, draw the circuit out, simulate it, profit. It won't take you too long, there are tutorials all round the web. Measure the voltages out where the drivers would connect (Low+-, High +-) and run an AC simulation
Or get REW and measure it that way using loopback connections to a soundcard. I wrote a guide on how to do it which is on this site somewhere. |
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snowflake
Old Croc
Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3122 |
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Posted: 30 May 2017 at 4:44pm |
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are those inductors different sizes or is the perspective messed up?
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Risc_Terilia
Young Croc
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Posted: 30 May 2017 at 5:11pm |
Different sizes
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ceharden
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Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776 |
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Posted: 30 May 2017 at 9:30pm |
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There are a few configurations you can do with that board.
Edited by ceharden - 30 May 2017 at 9:31pm |
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Earplug
Old Croc
Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
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Posted: 31 May 2017 at 9:07am |
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"Will this crossover give less power to the high pass output or will it just do equal split?"
With the xover point at 2k2, you only need about 15%-20% of the overall power going to the top end. The xover will ensure that happens - and if that is still too much, it looks like you can fit a couple of resisters to attenuate the signal. Didn´t the board come with any instructions? |
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Earplugs Are For Wimps!
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Risc_Terilia
Young Croc
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Posted: 31 May 2017 at 12:04pm |
I tried it out last night, by my reckoning it needs about 5.5dB off the top so I've bought the appropriate resistors. No there was not paperwork.
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Earplug
Old Croc
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Posted: 31 May 2017 at 12:59pm |
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Ok - a true DIY board.
 Glad you got it sorted, anyway.  |
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Earplugs Are For Wimps!
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Risc_Terilia
Young Croc
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Posted: 31 May 2017 at 1:11pm |
Yeah well Blue Aran have been helpful as they always are. The only thing is that I've not been able to get the precise resistance values and honestly I don't have the maths to reverse the formula to give me attenuation from resistances but intuitively I think that the only real difference will be a slight alteration in overall resistance as seen by the crossover.
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Earplug
Old Croc
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Posted: 31 May 2017 at 1:19pm |
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Passive crossovers are all an estimation anyway and best tweaked by testing. Hopefully it won´t make too much difference to your cabs. What are you using the xover for?
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Earplugs Are For Wimps!
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snowflake wrote: