Indian equivalents of the following DIY items.

[Vivek]

Now as far as intimidation is concerned you better stop calling me Bhai. You dont want the "real" Bhais to take umbrage to this. And the next time anyone calls me Mr. a Moderator will pay them a visit. to quote Jason L "There are 8 moderators. All over 7 feet tall. All over 17 stone. All trained athletes with bulging muscles and hair trigger reflexes. Each moderator is equipped with two low slung colt 45's, night vision glasses and armour piercing tracer shells."

Ain't that intimidating??

[ajju]

Sai,
Where are u put up in blr..!!
if u r somwhere near koramangala region there are a host of shops that sell plywood and glass..In fact there is a huge store on outer ring road ..they seem to have all kind of material...! And i've found nuwud at a couple of places..! Let me know if u want to check them out...!

the JBL's...
If ur going for a good stereo setup to match ur sub dont go for these...better get one of those 5" from peerless (as naveen suggested some time bk and if u want them from the local market)...
The 4" jbls i ve are again car speakers i guess..single driver with a wizzer cone...They sound a lot more mature than any other similar unit...the response seems controlled (especially the highs, they are not accentuated and dont posses that charecteristic harshness associated with car speakers), and reasonable power handling...( day b4 yesterday i managed to pass DC thru one of them...the result was the glue melted off and the vc got displaced..the VC dint blow though...and surprisingly i centred it back later using the same process... So that explains how much torture the VC can withstand...luckily the VC former had an AL strip on the inside to dissipate the heat...)
The specs i measured for these were..
fs - 90Hz
Vas - 4.1L
mms - 5.6gms
Qts - .34
Rdc 4ohms and the voice coil dia is around 1" so i suspect good efficiency too...! the basket is a stamped steel frame. The cone is made of paper coated with a polymer.

[avguy]

Hi,

Eventhough I do not have much experience in Diy stuff. I would like to throw some light on the subject. For mdf just try some shops in and around city market. Infact there are whole lot of shops who sell MDF sheets behind citymarket.

And for the damping material just try a company called anutone. Just contact them they may have some solution for your project.
Their email id is anutone@vsnl.com and their website is www.anutone.com. They are into consultancy and manufacture of solid acoustic boards and stuff like that.

regards,
Anand

[ssSai]

Guys,

Check out the URL Doug has posted on the thread, this pretty much tells us the A to Z of MDF.

Also check out the Wood Working tips.

This URL is very good for a fresher like me. Thanks Doug.

By the way,

Any suggestions for the Amplifier for the Shiva.

I am also giving a serious thought to go in for a ported than a sealed. Pretty confused. And ported stuff is all Greek and Latin to me. Any help?

[ssSai]

At last I join the DIYAUDIO family.

The moderator has finally given me the GO.

[tcpip]

Originally posted by navin
tarun, u have covered all the points....

What can I say? That's me...

araldite is much better than fevicol. it lasts forever.

One more reason I use Araldite is because if you use a slightly thick layer of it, it hardens to form a very accoustically dead separate layer all by itself, perhaps half an mm thick. This is because it has a lot of "body" after it hardens, and hard Araldite is very very accoustically dead... just try playing with a dried lump of it left behind after use. Therefore, two sheets with Araldite in between is actually three sheets with differing resonance patterns, making a very good composite sheet for vibration absorption.

I started out using 35mm MDF (rs. 80 / sq. ft) and found out hick wood stores too much energy.

Wow, I hadn't realised that too much thickness can be bad. In any case, if I need very heavy thickness, I'd prefer to use multiple layers of 18mm or 25mm sheets rather than a single thicker sheet.

then i got som 1.5mm lead sheet from Pydhonie (near Crawford market).

Thanks for the Pydhonie pointer. Lead is one material I think which works very well for deadening panel vibrations.

What I want to try is 12mm thick glass sheet. I think it will be very good, as an add-on on MDF or ply, for deadening lows and mids (its natural resonance is at very high frequencies, because of its rigidity), and it's also very heavy, so it should weigh down any MDF or ply to which it is stuck.

I intend to make the box of MDF, and then take internal dimensions of the panels, and get glass sheets cut to the right size. Then I intend to stick the glass sheets to the inner walls using my beloved thick layer of Araldite. Should be effective, don't you think?

Lead sheet, on the other hand, will have ultra low resonance frequencies (it's almost like putty). I'd somehow prefer something as heavy as lead but with a high natural resonance frequency, so that it offsets the resonance frequency of timber/MDF more effectively. Lead should be quite good, nevertheless, though.

I normally use 1.5 mm veneer...

All the veneer I seem to see in timber shops is 4mm ply, with the veneer on one side as the outermost sheet. I have never seen 1.5mm veneer. Where do you get yours from? And I think I prefer the veneer being thicker, because it basically becomes one more layer (again with my beloved Araldite) to the panel.

And the next time anyone calls me Mr. a Moderator will pay them a visit.

Fat chance. Remember, I live in New Bombay. The prospect of travel to this place is so intimidating that some people I know who live barely thirty kilometres away in Breach Candy can't even imagine coming here, even when free JX92S auditions and free beer are on offer. So, take your threats elsewhere, mister.

regards,
Tarun

[Doug]

>>This URL is very good for a fresher like me. Thanks Doug.<<

That's " mister " Doug to you !!

A ported enclosure shouldn't be to difficult for the Shiva. I'll check the Adire website to see what they have to say.

Are you using this subwoofer in the house or in your car ?

Doug

[tcpip]

Originally posted by ajju
The specs i measured for these were..
fs - 90Hz
Vas - 4.1L
mms - 5.6gms
Qts - .34

Wow, that's really interesting. How would you rate their clarity and delicacy? And how much did you pay for them? I've been wanting to try building an inexpensive four-speaker OB line array using smallish wide-range drivers, and my friend, the wize old AngshuDas suggested that car speakers would be a good place to begin looking. I originally wanted to try using the Philips dual-cone (easily available, Rs.220/each) but they have one major problem.... they're 8" in dia, thus making inter-driver distance a bit too long for useful line arrays. Your JBLs seem an excellent idea. Can you tell us some more? How high do they go, for instance? And can you give me a specific model number by which I can go looking in Lamington Road?

Thanks and regards,
Tarun

[tcpip]

Originally posted by ssSai
Any suggestions for the Amplifier for the Shiva.

Where do you get drivers like the Shiva in India? This becomes curiouser and curiouser...

Irony is that Shiva (the driver) is named after an Indian god. And it's available everywhere but India.

BTW, I guess you know that good pro bass drivers from Selenium are available in Bombay? Variac's lovely modded Basszilla uses the Selenium WPU1505, for which I got a quote of Rs.8000/each plus taxes. There is a steady supply through a big pro-sound establishment called Narain's. Check their Website (no prices, though). They are very prompt in responding to email, if you write to info at narainindia.com. I got price quotes and other information in 24 hours.

regards,
Tarun

[navin]

tarun wrote.....All the veneer I seem to see in timber shops is 4mm ply..........Fat chance. Remember, I live in New Bombay. The prospect of travel to this place is so intimidating that some people I know who live barely thirty kilometres away in Breach Candy can't even imagine coming here, even when free JX92S auditions and free beer are on offer. So, take your threats elsewhere, mister.

thanks for the reminder. only u forget the moderators are more motivated than me :-)

one day if I visit your area i will drop you a line. normally my ride is between BC and Worli and that is infuriating enough often it takes me as much as 20 mins to get home in the evening.