Crossover help

[bs1777]

Please help. I have a 8 ohm amp with 2 channels. I recently bought some 4 ohm speakers to go with it. I want to cross it over but i dont want to spend much money. I found a good deal on a crossover that is 4 ohms. Being that me amp is 8 ohms, is it safe to connects the two, and if so what will be the side affects? My amp is a sony and if hooked up to different impedance speaker, after volume 20 it goes into protect.

-Thanks

[vdi_nenna]

If your amp can handle no less than 8 Ohms, don't use speakers that are 4 Ohm.
You can damage the amp.

Your choices are to get an amp that can handle 4 Ohms or less or work with 8 ohm drivers and crossovers. The speaker drivers are what's dictating the impedance, not the crossover. The crossover is designed around the impedance of the drivers.

For example, in an 8 ohm, 2-way design that crosses over at 2000Hz, it will have different value crossover components (capacitors, resistors and coils) than a 4 ohm design.

Check out this calculator to get an idea of what's happening:

Passive Crossover Design Equations Formulas Calculator - Two Way First Order Network Butterworth

[Cal Weldon]

Originally Posted by bs1777

My amp is a sony and if hooked up to different impedance speaker, after volume 20 it goes into protect.

Your sentence says everything.

Can you buy two more of those speakers and wire them in series?

[bs1777]

So if i hook up my 4 ohm crossover will i be good, or will i wreak the amp?

[PeteMcK]

re:'will i wreak the amp? ' - highly likely,
What do think the crossover will do?... Crossovers need to be designed for specific speakers, a 'a good deal on a crossover that is 4 ohms' is a waste of time, get your money back and buy speakers that match your amp...

[Pano]

Strange that the Sony amp will not do 4 ohms, but going into protect mode tells you it can't.

Can you give more details in your speakers and the crossover you found? And what are your goals, apart from low costs?

[bs1777]

Originally Posted by PeteMcK

re:'will i wreak the amp? ' - highly likely,
What do think the crossover will do?... Crossovers need to be designed for specific speakers, a 'a good deal on a crossover that is 4 ohms' is a waste of time, get your money back and buy speakers that match your amp...

-The crossover is electronic. It is a Audiopipe CRX-303. If you could tell me a little more about this crossover, that would be great. It says to be 4 ohms but will it still work with me amp? A pay very little for the woofers and i really like them and want to keep them. Thanks.

[vdi_nenna]

Your crossover is passive, high-level. It goes after the amp and before the speakers.
Is your speaker a three-way low, mid and high frequency drivers?

The crossover is not your problem. The amp is your problem. It can't handle the current of a low impedance driver(s). It over heats and goes into protection.


You need an amp like this one-

AudioSource AMP100 2-Ch Source Switching Power Amplifier | Parts-Express.com

It can handle 8 and 4 Ohms speakers...for the price of little more than 2 crossovers.

[bs1777]

I like my current amp but thanks for the reccommend. Is there any sugestions for a good cheap crossover that would work for my amp? And is there a way to make that crossover work?

[bs1777]

So would my 4 ohm crossover work with my amp? And i only need a 2 way crossover after some recent testing.

-Thanks