In terms of the loudspeaker itself the only thing I can think of is to dope the cone if the cone is undoped...Doping make the cone slightly heavier and thereby changes the tonal balance of the loudspeaker...My feeling is that the speaker will probably loose home of its highs as the resonant frequency will drop a little.....The doping also stiffens the cone which will probably increase mid-range output somewhat.....

I'm sure Doctor Alan will come up with some ideas and explanations soon......

The only user type speaker mod I know of is tearing the cones for more distortion.

A pro speaker repairer can change cones dust caps and voice coils to taste (within reason - spares permitting), but those type of people seem rare these days and I think you have to really know what you are doing.

Hm. The frequency response is not about favouring one frequency. The sound of a speaker is also not just about the frequency response. Let's run through the dominant design characteristics and see if you get the point. The speaker consists of a coil (choose wire size, turns, width and material of bobbin) moving in a gap (choose width, height, material) in a plate that is magnetically connected to a magnet (choose material, size etc). The coil is connected to a cone (choose material, shape, doping, diameter etc etc) that is suspended in a surround (choose construction to get various stiffness depending on excursion) and some other suspension with similar stiffness parameters. Then the inner diameter of the cone is covered by a dust cap and/or phase plug. All in all well over ten dozen parameters to play with. You will be able to influence not only the frequency response, but also the step response in all audible frequencies as well as the impedance curve. Oh joy, the point is that even manufacturers only get some grip on it by experimentation and finite element analysis. Just look at the amount of dedicated guitar speakers that just do not sound so very good, even they don't get it right most of the time.

Now what you can do as a user of said speaker, is to play around with the amount of air behind the cone, the damping, standing waves, porting and/or by increasing the weight of the cone itself. The latter was a popular sort of experiment in the fifties and sixties, but is not such a good idea if you want fast speaker response. If you operate a guitar speaker in an open back cabinet, you can forget about air stiffness, damping, standing waves and ports as well. The high end response of the cone can also be altered, by slicing like Alan mentions but also by doping or removing dope. The results will be uncertain indeed.

You are leaving out one more thing: a guitar speaker is meant to have a high efficiency at the expense of a flat response. The hifi speaker is meant to have a flat response at the expense of low efficiency or very high price. Designs are quite different.

My advice would be to forget about modding speakers, you will not make a guitar speaker out of a hifi one. Sorry.

The short answer as a user would be......no....We'll leave that to the loudspeaker manufacturers.....Then we pick one we like to suit our taste and style...and budget...

I say buy a proper speaker from the start.

I had a mate that took 4 cerwin vega Pro 12 strokers and installed them in a 412 cab. Bear in mind that the Pro 12 is a R12000/ 1500 RMS car audio subwoofer. He was running a huge QSC amp on each one, loud as hell, but a R6000 cab loaded with GT12 75's and V30's sounded way better.

The stroker Pro12

Isnt that always what it should be?
Use the correct tool/speaker/whatever for the job?

BTW if you were thinking of converting a HiFi speaker into a guitar speaker you probably have a better chance of falling pregnant through wind pollination...!!!... :-\ :-\

Guitar Speakers Produce, HiFi Speakers Reproduce......big difference.......

TomCat wrote: BTW if you were thinking of converting a HiFi speaker into a guitar speaker you probably have a better chance of falling pregnant through wind pollination...!!!... :-\ :-\

I nearly wet myself laughing...

For the normal DIYer to just go out and do a few things on a speaker to change it's tone somewhat .... uh not happening. But if you knew how to build a speaker from scratch then I'd say you might be able to change a speakers tonal character, by maybe tweaking somewhat on the coil side or even magnets.... yet again keep in mind changing the coil might change the tone, but you still have to keep in mind air gaps, construct material and all the other 1000 things Gearhead mentioned. So unless you love doing math and hours and hours worth of it I'd forget about modding speakers.

My end advice would be if you really want to know how to do it just because you can then try and google some info on it.
Who knows you might just bring out your own speaker ? ..... Now you have piqued my interest again in it too