My Bookshelves have no stuffing.....

[]|[ GorE]

Ok my Panasonic SB-310 bookshelves have no stuffing inside them.
They are sealed.
The 12 cm midwoofer doesnt sound clear,it doesnt go deep and neither produces thud.But somehow it seems to reduce vocal intelligibility.
Setting Low to -1 in the amps tone controls helps things a lot but the sound deepness is reduced considerably.Sound thin that is.

Should and can i line the interiors with pillow stuffing ?
.
Thank You very much.

[Jim85IROC]

Your total cost will be about $3, and at the most, you'll have wasted 10 minutes of your time. Why not just try it? Fill one, and a/b the two speakers. I lined my small 2-way Dayton/Vifa speakers with 1/2" carpet foam padding and could easily recognize a big difference in vocal clarity with and without the padding. You may want to try lining the enclosure with the same material, as well as adding the polyfill.

[]|[ GorE]

Whats carpet foam padding ? Are you referring to the cheap carpets with a mesh(made of plastic) underneath ?
Should i use glass wool if i can find some.

Update: Applied some glass wool behind the midbass over the crossover.All i could see on the PCB mounted crossover were a wire wound rount thing,one big capacitor and something else.

[Jim85IROC]

The stuff I was referring to was Home Depot's premimum 1/2" foam carpet padding. It's a bunch of small foam pieces that are pressed together to create a sheet of multi-density foam. Every carpet place should have a very similar product.

[]|[ GorE]

Thanks for the reply.
Could you tell me how to get about making a passive crossover for my speakers.
The pcb currently has a cap,an inducator and a wire wound coil on it.
Thats it.

[Jim85IROC]

It's far too involved to be able to "tell you how" in the scope of a single reply. The best suggestion I can give is to read this forum (as well as madisound.com's forum and partsexpress.com's forum) extensively. There are also numerous books that could be of great help.

[Vivek]

Why would you want to install a different crossover? The wiser thing to do would be to upgrade the XO components. Find out what kind of capacitor has been used. If it is an electrolytic, change it to a metallised polypropylene one. If the inductor is an iron-cored one, try to replace it with an air-cored coil (that is if you can measure the value somehow).

Vivek

[santi]

]|[ GorE
I use panasonic too (SC-DT100). My original speaker (closed box) has a little stuff. I fullfill it with polyester (that I use in my aquarium filter). The midrange was improved. Much more detail. After that I bi-cap the eletrolytic NP 1.8 uF with the WIMA MP 0.1 uF. The hi-frequency was a bit laid back, clearer and has more detail. The rough sh... sound was quiter.

The next thing to do is rebuild the crossover with better parts. The original crossover use 0.68 mH ferrite-cored (shown on sticker label), Electrolytic capacitor NP 1.8 uF, 4.7 Ohms resistor.

Now I am on waiting for crossover parts. I will replace the ferrite-cored with air-cored and replace electrolytic with polypropylyn. I will construct it using the original schematic but better grade components and by point-to-point not PCB.

Santi