Help design a 3 way crossover, Please.

[cesarin]

Hello,

I was wondering if I could please get some help designing a crossover diagram and a list of the supplies I would need to build this.
The speakers are from what use to be a powered Mackie sr1530, but in no longer has an amp. When i got the speaker it only came with the speakers and the cab it does not have a single part from the amp, so fixing the amp is not an option.

I found the following info not sure if it helps, the original speaker had The following:

Crossover Points of 700Hz, 3,000Hz
Freq. Range (-10 dB) 40Hz - 20kHz
Freq. Response (-3dB) 45Hz - 18kHz

I found it on the following page.

http://www.mackie.com/products/sr1530/SR1530_specs.html

Here are the components I have:

Low
15’’
2.5” Voice Coil Diameter
250W rms (Long term) Power Handling
16 ohm

----------

Mid
6”
2” Voice Coil
60W rms (Long term) Power Handling
8 ohm

----------

High
1”
1” Voice Coil
25W rms (Long term) Power Handling
8 ohm

Thank you!

[cjd]

This data only lets us throw a textbook crossover at you, which probably won't result in anything that sounds too good.

[cesarin]

So what could I do, what kind of data should I try to get? I was hoping to use the speaker as a personal monitor for a bass player. I think any result is better than dumping the speakers so i would not be extreamly picky on the results.

[cjd]

Hmm. Have you tried simply wiring up the 15" by itself?

If we could dig up impedance graphs, we might have a slightly better shot at getting something reasonable, though probably it would be brute-force attemting to force impedance to pretend it's flat (which is what textbook crossovers assume.)

[cesarin]

Ill try just the 15" to see what kind results i get thank you

[cjd]

If it sounds nasty on the top end, you could try something simple like a 1mH inductor in series. It won't do a lot at 16ohm but it should soften the top end where rough stuff would live and perhaps make it usable.

If your bass player is looking for detail (it's there - string noise, other little nuances based on how you interact) it may not be as audible as desired without something that plays a little higher, but it may be plenty.

To be honest though, I would *really* recommend in-ear monitors. It's just too loud, and the noise reduction you get from the good ones is worth the cost of even basic 100% custom IEM's (Ultimate Ear being my reference - my next set will be customs, and I use them just for the daily commute on the train.)

[cesarin]

Cool i will try that do you have a diagram of how the 1mh inductor would look like in series. In ear is definitly in our future plans

[cesarin]

If we could dig up impedance graphs, we might have a slightly better shot at getting something reasonable

Hi I was wondering if the praphs that I found on the following link would help:

http://www.mackie.com/pdf/sr1530_om.pdf

Thank you!

[cjd]

Unfortunately, there's only summed response data there.

[cesarin]

oh ok, I guess Ill stick to plan B with the 1mH inductor in series. thank you again