 Building a sub |
Yawn 
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Registration Date: 25-01-2005
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Im currently in the process of building myself a sub and seem to have come across a couple of stumbling blocks - It's two 100w subs with seperate enclosures in one box, im planning to use it in my house (to aid me with my production) so I want to be able to run it from my normal stereo amp. In order to cut out the high frequencies that come from the amp I am assuming that I need to mount crossover devices. The problem that I am having is that all the crossover devices I have seen to buy are 8 ohm & my subs are only 4ohm.... Is it essential that the crossovers I use match the subs exactly? If it isn't essential will there be any negative consequences or degredation of the quality of sound produced?
If anyone can help I would be very grateful 
as I need some phat bass!! 
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11-02-2005 14:44 |
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Surya
The Robot
Registration Date: 04-11-2002
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2 speakers @4ohm = 8ohm, no?
Dunno, I know shit about electronics...
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"In dnb you should make people jump not swim"
- Pieter Frenssen 2004
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11-02-2005 14:48 |
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Rude
I'm gonna get you
Registration Date: 06-01-2005
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www.speakerplans.com
I've been searching for plans to build myself a subwoofer too, this is the best site I could find.
see ya
and for crossovers, maybe you could buy an electronic crossover? try www.beglec.com for audio-equipment and stuff, you can find some stuff there like crossovers n shit.
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11-02-2005 15:00 |
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Yawn
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Registration Date: 25-01-2005
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| quote: |
Originally posted by Surya
2 speakers @4ohm = 8 ohm, no? |
They will be running on seperate channels with a crossover for each sub, so probably I wont have them linked together 
| quote: |
Originally posted by Rude
www.speakerplans.com
I've been searching for plans to build myself a subwoofer too, this is the best site I could find. |
Cheers for the link, i've had a quick look and it looks pretty cool, especially for the construction of the enclosure 
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11-02-2005 17:23 |
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djfreemc
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Registration Date: 25-07-2003
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It's simple electronics that when your source and load have the same impedance u get maximum power transfer. so it is best if both your speakers & amp/x-over/whatever have the same impedance. I still prefer 8 ohm speakers over 4 ohms actually. Dunno still find them more powerfull & better sound.
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The mysteries of the distorted snare...
Can't win if u don't play
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12-02-2005 11:49 |
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Have you read this ???
Good reading
you need to read this before you start building .
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Megalomania Rules!!!
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13-02-2005 00:19 |
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Halph-Price
Zombie Algorithm
Registration Date: 22-12-2004
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have you understood advanced engineering, the essay is msotly talking about how engnieers don'te ven understand this shit. you compreheand that?
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13-02-2005 01:35 |
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dirk
Steppa
Registration Date: 14-11-2004
Posts: 184
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| quote: |
| Is it essential that the crossovers I use match the subs exactly? |
Yes !!!
Loudspeakers don't have resistance but impedance this means that the resistance changes with frequency !!! eg. the resistance at 100 Hz can be 8 Ohm but at 40 Hz ( resonance of loudspeaker ) it can be as high as 100 Ohm and this is only a little more than an octave apart .If you double the impedance of a speaker the crossover frequency also doubles . This means that it is almost imposible to make a passive crossover at this frequency ( 100 Hz )
I suggest you by a sepatate active subwoofer crossover and a power amps for your subs.
Check this Hypex modules
Greetings Dirk .
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14-02-2005 07:28 |
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Yawn
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Registration Date: 25-01-2005
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Nice one! cheers dirk, i'll have to see if i can get my hands on a hypex amp as they look pretty sweet & would be perfect for my setup
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14-02-2005 10:56 |
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