Passive crossover design |
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3122 |
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use an active crossover with separate subs and tops
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DJ-Versatile
Registered User Joined: 04 March 2013 Location: United Kingdom Status: Offline Points: 392 |
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I always do usually, but i was wondering if there was a way to do it passively as the system i'm designing is meant to be as portable as possible without going active.
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If you are the smartest person in the room, you're in the wrong room....
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markie
Old Croc Joined: 31 October 2005 Location: Sunny Liskeard. Status: Offline Points: 4570 |
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Passive crossovers on sub are rather inefficient, need huge inductors which add weight to the box and cause a worldwide copper shortage. Go active from sub to mid/top.
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If it's got wheels or tits it's gonna cost a fortune
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3122 |
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use a LPF first and then split it to high and low. fit the crossover in the top box so they can be used alone.
you will need huge components to do even the 120Hz crossover passively. the 35Hz HPF is better done by an amp or crossover with an active filter.
Edited by snowflake - 28 April 2016 at 5:58pm |
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Modeller
Registered User Joined: 03 March 2016 Location: UK Status: Offline Points: 31 |
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Much appreciated Earplug. Are these available any smaller? I have just a few millimetres to cram all this in. Is there are simple variable crossover on a chip available?
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Andy Kos
Old Croc Joined: 15 May 2007 Location: Southampton Status: Offline Points: 3038 |
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Not in passive format, only active. Thing is with passive components they need to be a certain size in order to handle the power levels. An active crossover does this at line level (before the amplifier) where the power levels are minimal.
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just a guy with a warehouse and a few speakers... www.bluearan.co.uk
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DJ-Versatile
Registered User Joined: 04 March 2013 Location: United Kingdom Status: Offline Points: 392 |
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Thanks for your help guys!
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If you are the smartest person in the room, you're in the wrong room....
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3122 |
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if u r worried about portability it is worth considering that the weight of two or three huge inductors is possibly more than a 1U active crossover
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DJ-Versatile
Registered User Joined: 04 March 2013 Location: United Kingdom Status: Offline Points: 392 |
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Crikey! OK, I've had a little redesign and know where I am headed with it now. Thanks for everyones help as always!
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If you are the smartest person in the room, you're in the wrong room....
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Modeller
Registered User Joined: 03 March 2016 Location: UK Status: Offline Points: 31 |
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Thanks Andy, but I only have 3-5 Watts in my system. Is there an alternative, less precise way I could adapt to use as a low power crossover?
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
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You could try lower power/voltage components, eg:
http://www.digikey.com/product-detail/en/wurth-electronics-inc/74458303/732-3931-2-ND/3316515 2 of those in parallel. |
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Earplugs Are For Wimps!
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Modeller
Registered User Joined: 03 March 2016 Location: UK Status: Offline Points: 31 |
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It's been a while from when I originally posted this (the model world moves very slowly...) but I've got some details on the amp I'm tied to using.
As I said in a previous post, this is for model sounds, so high fidelity is not a key requirement, but separating the frequencies is quite important. The amp is 3W at 4-8Ohm. I'm going to be using 3 drivers (1x sub, 2x mono mid/high). I need to build a passive crossover to suit and select the drivers most suitable within these limits. Any help with the crossover would secure my gratitude for life! Cheers, Steve
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