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Old 8th November 2012, 04:21 PM   #1
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Default Speaker Crossover Use at Line Level?

I have speakers I'd like to bi-amp.
The crossovers for the speakers have common inputs and low/hi outputs.
Can I do a quick test using these crossovers at line level to feed the power amps?
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BNK
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Old 8th November 2012, 05:06 PM   #2
Pano is offline Pano  United States
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Not sure I understand. They aren't normally line level? The inputs are made for speaker level inputs?

If that's the case, you won't hurt them with line level. The input may have a low impedance, tho, if designed for speaker level.
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Old 8th November 2012, 05:07 PM   #3
DrDyna is offline DrDyna  United States
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That's not going to work, the input impedance of an amplifier is usually tens of thousands of ohms and crossovers are designed to work with speaker impedance, usually less than 10 ohms.

It would be sorta like hooking up a 50,000 ohm speaker to the crossover, the crossover point won't even be in the same solar system as it should be.
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Old 8th November 2012, 05:12 PM   #4
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Thanks... I suspected as much but I am no engineer... I am a musician so I ask!
Thanks,
BNK
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Old 8th November 2012, 05:13 PM   #5
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No because the impedances of the two arrangements are very different. With the existing high level position the capacitors and inductors will have values appropriate for the speakers. These are usually around 4 or 8 ohms. At line level they are often in the tens of thousand of ohms (10,000's). Now as the general level of impedance rises the values of the capacitors drops proportionately and the inductors rise by the same factor.
There are some threads about line level crossovers on this site.

Most are "active" involving filters designed around small IC op-amps but there are one or two threads using "passive" circuits.
Sounds like you may like to read up this area a bit more.
A good source of short articles on theory can be found at a site run by Rod Elliot. It is Elliot Sound Products (Sydney).
Googling ESP audio Sydney will bring it up.
He has many articles on audio and at least three on active systems.
That should be a helpful place to start.

Good luck. Cheers, Jonathan
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Old 8th November 2012, 05:18 PM   #6
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Threads merged. Please do not start the same thread in multiple forums. See the rules. #14
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Old 8th November 2012, 06:01 PM   #7
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by bassnkeys View Post
.. I am a musician so I ask!
what kind of speaker are we talking about
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Old 8th November 2012, 06:28 PM   #8
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Sorry for the confusion bassnkeys, two new posts got in during an edit. J
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Old 8th November 2012, 06:28 PM   #9
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Old 8th November 2012, 08:56 PM   #10
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"Factory rebuilt MG 3's"

Well that sure was a conversation stopper brassnkeys! Ha ha.
Might need to get the planar/exotics people in on this one!
In fact if they (the MG 3's) are what I think they are you might get one of the moderators to move this thread from multi-way into the other "planar & exotic" section. People there may well have done what you are proposing. You'll need proper schematics or get the electrical or acoustic curves measured etc. Doable and fun but a serious job me thinks.....good luck.

But the earlier reservations about exchanging high level xcross overs for low level units still applies I'm afraid...
Jonathan
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