Re: Ok
For a midbass the driver has a high Fs. But if you notice that Vas is also auite small and this indicates that the driver was mae for midrange duties operating from 200Hz+.
I disagree with Palesha-ji about the Mms being to low to produce bass. ScanSpeak 18W series woofers as well as Seas NX series woofers for example all have Mms in the 10-12gms range and produce quite a bit of bass.
I agree with Palesha-ji that making a driver in ones and twos is not a efficient method. It is better to soruce a driver that is made in 1000s. China makes some rather good drivers today. companies like Tympany make many of their drivers there.
I also agree with Palesha-ji that a sutiable 6.5" might be more available.
One option would be try and source some drives made by Peerless India. I have seen a 5" mid made by them but not heard it. It looked well built.
Still you would neeed access to LEAP/LMS, MLSSA, or something similar to verify that the driver adheres to published specs. I hear Bolton also still makes a few drivers that are available for DIY, just where I have no idea.
as far as the DCR of inductors go there is freeware on www.lalena.com that will help you design an inductor. the lower the DCR the better but lower DCRs mean more wire and hence is more expensive.
SoundsGreat said:
SoundsGreat said:
For a midbass the driver has a high Fs. But if you notice that Vas is also auite small and this indicates that the driver was mae for midrange duties operating from 200Hz+.
I disagree with Palesha-ji about the Mms being to low to produce bass. ScanSpeak 18W series woofers as well as Seas NX series woofers for example all have Mms in the 10-12gms range and produce quite a bit of bass.
I agree with Palesha-ji that making a driver in ones and twos is not a efficient method. It is better to soruce a driver that is made in 1000s. China makes some rather good drivers today. companies like Tympany make many of their drivers there.
I also agree with Palesha-ji that a sutiable 6.5" might be more available.
One option would be try and source some drives made by Peerless India. I have seen a 5" mid made by them but not heard it. It looked well built.
Still you would neeed access to LEAP/LMS, MLSSA, or something similar to verify that the driver adheres to published specs. I hear Bolton also still makes a few drivers that are available for DIY, just where I have no idea.
as far as the DCR of inductors go there is freeware on www.lalena.com that will help you design an inductor. the lower the DCR the better but lower DCRs mean more wire and hence is more expensive.
FWIW, Thiel has a sale on their website for some nice 8" woofers - Thiel designed, Vifa manufactured:
http://www.thielaudio.com/THIEL_Site05/Pages/Specials/CSWoofers/SpecialCSwoofers.html
While not cheap-cheap at $95 each, they still represent good value for their quality, IMHO. The best alternative that's less expensive is the Pioneer BF20FU20 'Bofu' driver, which runs to about $25 each:
http://www.diyaudio.com/forums/showthread.php?threadid=110703&pagenumber=1
Either of these is a far better alternative to building your own driver.
http://www.thielaudio.com/THIEL_Site05/Pages/Specials/CSWoofers/SpecialCSwoofers.html
While not cheap-cheap at $95 each, they still represent good value for their quality, IMHO. The best alternative that's less expensive is the Pioneer BF20FU20 'Bofu' driver, which runs to about $25 each:
http://www.diyaudio.com/forums/showthread.php?threadid=110703&pagenumber=1
Either of these is a far better alternative to building your own driver.
Hmmmm!
Thanks Navin,Palesha and linuxguru,
As I've already said I've gone through as many websites as there is on the net including lalena,shavno music, kbapps etc etc,so after all that only I asked the opions of you guys as the information given there was not enough ( atleast to my friend who is going to wind the coil for me).
as I've already informed I don't mind using 6.5" driver and scrap the idea of 5.25".but my idea was to use the 5.25" for the frequncies from 300-2.5k 0r 3k ( the driver manufacturer says it will perform linearly till 5K) and for the below 300Hz planned to use the 6.5" and for the above 2.5-3K the dome ( I have some peerless one's ).
As far as the peerless is concerned where can I buy it ? I've tried to talk all the people I know including the TORVIN ( who are supposed to be the distributers for south india, they also use the peerless drivers in all their products) but nothing much happened.
Again let me delibrate the point that I've done all that there is to do to find an econimical driver in india for the past 8+ years so far nothin,I've recently talked to Mr.Shyam of Norge who are now importing drivers from a company called Wavecor
This is what is the company says about thier drivers
Quote :
"Welcome to Wavecor -
the innovative force in loudspeaker technology.
High quality loudspeaker units for industry and personal customers (DIY) - for Hi-Fi stereo, multi media, home theater, pro, car applications, etc. Tweeters, midranges, fullranges, woofers, subwoofers.
Evaluation kits. Complete car component sets. Complete OEM speaker system turnkey solutions for the industry."
I checked thier site to find some interesting drivers but when I checked with norge they don't stock all the models infact they only have two models dome with neo magnets and one 6.5" with neo which again is priced prohibitry rate of 2600 + for each for 6.5" and 1600+ for the tweeters.
I don't know whether you guys knew this if not you can checkout thier site.
http://www.wavecor.com/html/speaker_units.html
for the people with who are ok seas and scanspeak and vifa the price is fair but not for me.
coming to the bolton driver I've recently talked to the main dealer for bolton in bangalore he says they don't have 6.5" anymore as the company stopped producing the same. allmost all the traders in bangalore now stock drivers from DAINTY (chineese I presume) which I did try but asusual nothing great plus no spec is given with the driver and I don't have the required equipments to measure myself.
I also tried to mail Tympany and tangband about 2 months back and Am still yet to get a reply from either company,so been there done that,all every single means of getting an good average priced driver.
Now what Am I supposed to do please advice.
Regards.
Thanks Navin,Palesha and linuxguru,
As I've already said I've gone through as many websites as there is on the net including lalena,shavno music, kbapps etc etc,so after all that only I asked the opions of you guys as the information given there was not enough ( atleast to my friend who is going to wind the coil for me).
as I've already informed I don't mind using 6.5" driver and scrap the idea of 5.25".but my idea was to use the 5.25" for the frequncies from 300-2.5k 0r 3k ( the driver manufacturer says it will perform linearly till 5K) and for the below 300Hz planned to use the 6.5" and for the above 2.5-3K the dome ( I have some peerless one's ).
As far as the peerless is concerned where can I buy it ? I've tried to talk all the people I know including the TORVIN ( who are supposed to be the distributers for south india, they also use the peerless drivers in all their products) but nothing much happened.
Again let me delibrate the point that I've done all that there is to do to find an econimical driver in india for the past 8+ years so far nothin,I've recently talked to Mr.Shyam of Norge who are now importing drivers from a company called Wavecor
This is what is the company says about thier drivers
Quote :
"Welcome to Wavecor -
the innovative force in loudspeaker technology.
High quality loudspeaker units for industry and personal customers (DIY) - for Hi-Fi stereo, multi media, home theater, pro, car applications, etc. Tweeters, midranges, fullranges, woofers, subwoofers.
Evaluation kits. Complete car component sets. Complete OEM speaker system turnkey solutions for the industry."
I checked thier site to find some interesting drivers but when I checked with norge they don't stock all the models infact they only have two models dome with neo magnets and one 6.5" with neo which again is priced prohibitry rate of 2600 + for each for 6.5" and 1600+ for the tweeters.
I don't know whether you guys knew this if not you can checkout thier site.
http://www.wavecor.com/html/speaker_units.html
for the people with who are ok seas and scanspeak and vifa the price is fair but not for me.
coming to the bolton driver I've recently talked to the main dealer for bolton in bangalore he says they don't have 6.5" anymore as the company stopped producing the same. allmost all the traders in bangalore now stock drivers from DAINTY (chineese I presume) which I did try but asusual nothing great plus no spec is given with the driver and I don't have the required equipments to measure myself.
I also tried to mail Tympany and tangband about 2 months back and Am still yet to get a reply from either company,so been there done that,all every single means of getting an good average priced driver.
Now what Am I supposed to do please advice.
Regards.
Check out the Philips and Bolton offerings - some simple mods are possible to improve their characteristics:
1) Coat the paper/cardboard cone with PVA (Polyvinyl Alcohol). This is available at some industrial supplies vendors, but in larger quantities than required for DIYers. However, you can find 30ml tubes of PVA at most stationery stores under the name "Lord's Synthetic Gum", packaged and distributed by Annam Enterprises, Chennai-2.
You just need to apply and spread it evenly on the cone (not the surround). I just use my fingertip. After it dries, repeat the process for a total of 3-4 coats. After the process is complete, the cone will have a slightly rubbery, shiny finish instead of the dull matt black of plain cardboard.
The effect of the PVA is to stiffen the cone slightly and lower the noise floor caused by tiny strands of paper sticking out of the surface of the untreated cone. The breakup modes are also slightly damped.
2) Gently and carefully remove the dust dome/cap at the centre of the cone, pack some felt/polyfill/cotton wool into the dome, and re-attach it to the cone with super glue (you can also use a larger dome cap - mylar dome caps of various sizes are available at S.P.Road for about Re.1 each). The effect of the felt is to damp the resonant cavity between the dome and the pole piece at the centre of the driver, which can cause undesirable resonances anywhere between 2 kHz and 20 kHz.
The effect of both mods is to reduce the conversion efficiency of the driver a little bit, due to extra damping as well as greater cone mass. However, the result will be a more linear and better sounding driver.
1) Coat the paper/cardboard cone with PVA (Polyvinyl Alcohol). This is available at some industrial supplies vendors, but in larger quantities than required for DIYers. However, you can find 30ml tubes of PVA at most stationery stores under the name "Lord's Synthetic Gum", packaged and distributed by Annam Enterprises, Chennai-2.
You just need to apply and spread it evenly on the cone (not the surround). I just use my fingertip. After it dries, repeat the process for a total of 3-4 coats. After the process is complete, the cone will have a slightly rubbery, shiny finish instead of the dull matt black of plain cardboard.
The effect of the PVA is to stiffen the cone slightly and lower the noise floor caused by tiny strands of paper sticking out of the surface of the untreated cone. The breakup modes are also slightly damped.
2) Gently and carefully remove the dust dome/cap at the centre of the cone, pack some felt/polyfill/cotton wool into the dome, and re-attach it to the cone with super glue (you can also use a larger dome cap - mylar dome caps of various sizes are available at S.P.Road for about Re.1 each). The effect of the felt is to damp the resonant cavity between the dome and the pole piece at the centre of the driver, which can cause undesirable resonances anywhere between 2 kHz and 20 kHz.
The effect of both mods is to reduce the conversion efficiency of the driver a little bit, due to extra damping as well as greater cone mass. However, the result will be a more linear and better sounding driver.
At the prices indicated for wavecor , you could also look at Vifa from www.corrson.com in Bangalore.
Damping with PVA glue should be tried cautiously. First of all it will make the cones heavier and reduce efficiency. Damping a resonance ( here) is not always a good solution. The damping of a high Q resonance will lower the Q but will spread over a wider range of frequencies.
Why would small fibers on the surface make noise ? That's new to me.
Damping the area under the dome is not very simple either .
The damping material should not touch the dome when it is reassembled. Additionally it should not significantly reduce the air volume behind the dome. A good experiment , but not quite as simple as it looks. A small amount of fluffy material will hardly help . I've seen some commercial units which use a moulded absorbent. Slightly stiff but quite porous.
But if your dome is easy to remove , there is no harm experimenting as long as you can go back to where you started.
It would help enormously if you have some sort of acoustic measurement setup. Even an uncalibrated mic will do as you would be looking at the difference in the response plots.
Damping with PVA glue should be tried cautiously. First of all it will make the cones heavier and reduce efficiency. Damping a resonance ( here) is not always a good solution. The damping of a high Q resonance will lower the Q but will spread over a wider range of frequencies.
Why would small fibers on the surface make noise ? That's new to me.
Damping the area under the dome is not very simple either .
The damping material should not touch the dome when it is reassembled. Additionally it should not significantly reduce the air volume behind the dome. A good experiment , but not quite as simple as it looks. A small amount of fluffy material will hardly help . I've seen some commercial units which use a moulded absorbent. Slightly stiff but quite porous.
But if your dome is easy to remove , there is no harm experimenting as long as you can go back to where you started.
It would help enormously if you have some sort of acoustic measurement setup. Even an uncalibrated mic will do as you would be looking at the difference in the response plots.
Thanks a lot!
Thanks a loty linuxguru and ashok for inputs really appriciate it.
linuxguru as I've said I did try with globe and others in SP for bolton without any result so thats out of question as with philips I've tried all thier models from 3 to 8",some of them were good which Am still using in some speakers.
Ashok I've talked and visited Corrson the day they started thier Business but very unfriendly people to deal with and way too expensive for all the stuff they stock which includes thier drivers and other components.so no Am going to them again.
Regards.
Thanks a loty linuxguru and ashok for inputs really appriciate it.
linuxguru as I've said I did try with globe and others in SP for bolton without any result so thats out of question as with philips I've tried all thier models from 3 to 8",some of them were good which Am still using in some speakers.
Ashok I've talked and visited Corrson the day they started thier Business but very unfriendly people to deal with and way too expensive for all the stuff they stock which includes thier drivers and other components.so no Am going to them again.
Regards.
Yes the behaviour of the folks at Corrson was very 'strange' to say the least .
Can't imagine how they'd sell 'expensive' parts ( or ANY parts ) with that kind of approach. I've been there twice . Both times it was the same. Very unfortunate !
Can't imagine how they'd sell 'expensive' parts ( or ANY parts ) with that kind of approach. I've been there twice . Both times it was the same. Very unfortunate !
Navin said :
The problem about mms here is that the driver is made locally.
If u want stiff & light weight cone then it is an expensive affair.
I don't think that local driver about which we r discussing may hv used such a high quality cone like B&W & others u hv mentioned. So my reply was like that.
Hope this clarifies more about my view.
The problem about mms here is that the driver is made locally.
If u want stiff & light weight cone then it is an expensive affair.
I don't think that local driver about which we r discussing may hv used such a high quality cone like B&W & others u hv mentioned. So my reply was like that.
Hope this clarifies more about my view.
As naveen already said that the chinese manufacturer require quantity.
In India there is no big demand for high quality DIY material.
i know Tangband from last 8 years & hv visited their factory.
i can help if there is a quantity order.
You mean like
DIYUSA , DIYUK , DIYJAPAN , DIYHONGKONG , DIYMALAYSIA , DIYGERMANY , DIYSWEDEN ,DIYBRAZIL , DIYBELGIUM , DIYPHILLIPINES , DIYCHINA , DIYPAKISTAN , DIYSOUTHAFRICA ..........................ETC .?
DIYUSA , DIYUK , DIYJAPAN , DIYHONGKONG , DIYMALAYSIA , DIYGERMANY , DIYSWEDEN ,DIYBRAZIL , DIYBELGIUM , DIYPHILLIPINES , DIYCHINA , DIYPAKISTAN , DIYSOUTHAFRICA ..........................ETC .?
Re: Hmmmm!
I feel your pain. I spent a bit of time and energy trying to convice Mr. Nagpal (Sonotone), Mr. Ratha (Peerless), etc.. to address the DIY market. Mr Rath also introduced me to Mr. Umesh Sharma who promised me a sampling of Peerless drivers but despite email reminders I got nothing. I am not sure if Umesh still works with Damodar. Palesha might know.
I also tried to get Sonodyne (Anandya Mukherjee) to give me some of his B stock but while they politely said yes there has been no action on this front.
Mr. Bajaj (Norge) does not stock a lot of drivers. He imports his speakers from Wavecor. His operation is a lot smaller than Mukherjee's, Nagpal's, Damodar's, etc.. and I dont think he intends to cater to the DIY market.
Now I just import all I need from Singapore since my brother in law (who is also audio crazy) lives there and he can source valves, OPTs and drivers for me.
BTW what price range are you looking at?
This works well on some of the older un-doped paper cones that Philips used to sell. I had experimented with PVA on a pair of dual cone Philips drivers that were OEMed in to my OPEL in 1996. It dropped sensitivity by 2-3db but improved both bass linearity and smootheded the midrange. unfortunately those philips drivers were so limited in their power handling that the lowered sensitivity made them un-usable for proper audio, ok for a dektop monitor powered by say a a small tube amp (think EL84 PP at 8W).
SoundsGreat said:
I feel your pain. I spent a bit of time and energy trying to convice Mr. Nagpal (Sonotone), Mr. Ratha (Peerless), etc.. to address the DIY market. Mr Rath also introduced me to Mr. Umesh Sharma who promised me a sampling of Peerless drivers but despite email reminders I got nothing. I am not sure if Umesh still works with Damodar. Palesha might know.
I also tried to get Sonodyne (Anandya Mukherjee) to give me some of his B stock but while they politely said yes there has been no action on this front.
Mr. Bajaj (Norge) does not stock a lot of drivers. He imports his speakers from Wavecor. His operation is a lot smaller than Mukherjee's, Nagpal's, Damodar's, etc.. and I dont think he intends to cater to the DIY market.
Now I just import all I need from Singapore since my brother in law (who is also audio crazy) lives there and he can source valves, OPTs and drivers for me.
BTW what price range are you looking at?
linuxguru said:
This works well on some of the older un-doped paper cones that Philips used to sell. I had experimented with PVA on a pair of dual cone Philips drivers that were OEMed in to my OPEL in 1996. It dropped sensitivity by 2-3db but improved both bass linearity and smootheded the midrange. unfortunately those philips drivers were so limited in their power handling that the lowered sensitivity made them un-usable for proper audio, ok for a dektop monitor powered by say a a small tube amp (think EL84 PP at 8W).
Even the diyspeaker group got developed SHIVA 15" driver from eminence in USA through adire audios.
This is very normal.
Why this things don't happen in India?
This is very normal.
Why this things don't happen in India?
Thanks a Ton !!
Thanks for comments Navin,
Its nice to hear that you are getting things from singapore.what are the drivers that you get from there ?? and how much it costs ?.
Am sure all of us DIYers at one point or another has tried to bang our heads to these companies with no result ! god knows why don't they even give us small importance is beyond my comprihension !
one more thing I want to do the testing of the driver and also measure the TSPs so Am thinking of buying HT Audios Woofer tester or Daytons tester ,which is better please advise. Also how can I do it without these tester can you please tell me ?
Regards
Thanks for comments Navin,
Its nice to hear that you are getting things from singapore.what are the drivers that you get from there ?? and how much it costs ?.
Am sure all of us DIYers at one point or another has tried to bang our heads to these companies with no result ! god knows why don't they even give us small importance is beyond my comprihension !
one more thing I want to do the testing of the driver and also measure the TSPs so Am thinking of buying HT Audios Woofer tester or Daytons tester ,which is better please advise. Also how can I do it without these tester can you please tell me ?
Regards
Yes, I Know that.
Mr. Nagpal is my friend. I know the sonodyne people also.
I know about Peerless. They r mainly into exports. Initially during my DIY days, i also faced the same problem. Today i know both sides. Business compulsions don't allow anyone to enter the DIY market due to it's small size. The good companies in the world ask for quantity. Then it becomes financially unviable to cater to DIY market in India. If someone call small quantity as it happens now, then the cost goes up & average DIY person can't afford it.
Few like Navin, George can afford to import from anywhere in the world.
Even the software maker like DAAS from germany has stopped their development of low cost software which was aimed at audiophiles.
Re: Thanks a Ton !!
even bigger was the Audio Concpets deal which gave each diyaudio subscriber the chance to get their 12" sub for $95. I imported 6 of them (4 for me and 2 for a friend) during this offer.
Then there was the 6" 2way usig a Audax Aerogel midbass and a Morel MDT33 tweeter and more recently a Jordan JX92 group buy.
Recently I have got fostex 167 for there but I also get EL34, 6SL7, 6SN7, 4 50W OPTs, a reel of Belden wire, etc... previous to that I had got 6 Scan Speak 18W8546, 2 18W8545 woofers, 2 2905-9900, 2 2905-9700 tweeters, 2 2905-9500 from Europe, even earlier I imported a pair of JBL 2245 woofers, 4 Focal 8N515 woofers, 2 Audax Aerogel midbass (I used them for midrange only), 2 Morel MDT33 tweeters from the US ...the list is really quite long and I am sure I have forgotten a few things..oh yes I had also got 2 pair of Focal 10" and 8" 516J series woofers used for TLs (by wife's brother has them now) and a long time ago some Dynaudio drivers (via Ram of R&S).
Costs at present are about Rs. 80-85 to the $ if you include taxes and duites. Since I live in Mumbai I pay octroi as well. When the dollar was Rs. 49 I used to pay Rs. 120-130 to the $ (as duites on finsihed drivers was a bit higher then).
Palesha ji we do not want the Nagpals or the Raths to devleop drivers for the Indian DIY community. Just to off load some of their regualr stock with existing specs to the community. I am quite sure places like Choudhry and Ramesh Trading or Pioneer (all on Lamington road, Mumbai) will be happy to stock these.
That is what I was trying to ask them to do. They have the operational infrastructure to do atleast this. Shyam does not.
Dont get me wrong, I am very impressed by the work these men (and women) are doing and despite competition from China the Raths have put Indias name on the audio map but the DIY community in India is only asking for scraps of existing products not customised delicacies.
I am not a rich man but maybe I just a bit more obsessed and happen to have brothers in law, friends and family who are willing to source, store and ship stuff to me. Next on my list are 5 Jordan JX92, 4 tweeters (not decided which), 2 Hawthorne 15" coax and 2 Augie, it gets longer by the minute...🙂
mhtplsh said:
even bigger was the Audio Concpets deal which gave each diyaudio subscriber the chance to get their 12" sub for $95. I imported 6 of them (4 for me and 2 for a friend) during this offer.
Then there was the 6" 2way usig a Audax Aerogel midbass and a Morel MDT33 tweeter and more recently a Jordan JX92 group buy.
SoundsGreat said:
Recently I have got fostex 167 for there but I also get EL34, 6SL7, 6SN7, 4 50W OPTs, a reel of Belden wire, etc... previous to that I had got 6 Scan Speak 18W8546, 2 18W8545 woofers, 2 2905-9900, 2 2905-9700 tweeters, 2 2905-9500 from Europe, even earlier I imported a pair of JBL 2245 woofers, 4 Focal 8N515 woofers, 2 Audax Aerogel midbass (I used them for midrange only), 2 Morel MDT33 tweeters from the US ...the list is really quite long and I am sure I have forgotten a few things..oh yes I had also got 2 pair of Focal 10" and 8" 516J series woofers used for TLs (by wife's brother has them now) and a long time ago some Dynaudio drivers (via Ram of R&S).
Costs at present are about Rs. 80-85 to the $ if you include taxes and duites. Since I live in Mumbai I pay octroi as well. When the dollar was Rs. 49 I used to pay Rs. 120-130 to the $ (as duites on finsihed drivers was a bit higher then).
palesha said:
Palesha ji we do not want the Nagpals or the Raths to devleop drivers for the Indian DIY community. Just to off load some of their regualr stock with existing specs to the community. I am quite sure places like Choudhry and Ramesh Trading or Pioneer (all on Lamington road, Mumbai) will be happy to stock these.
That is what I was trying to ask them to do. They have the operational infrastructure to do atleast this. Shyam does not.
Dont get me wrong, I am very impressed by the work these men (and women) are doing and despite competition from China the Raths have put Indias name on the audio map but the DIY community in India is only asking for scraps of existing products not customised delicacies.
I am not a rich man but maybe I just a bit more obsessed and happen to have brothers in law, friends and family who are willing to source, store and ship stuff to me. Next on my list are 5 Jordan JX92, 4 tweeters (not decided which), 2 Hawthorne 15" coax and 2 Augie, it gets longer by the minute...🙂
How about our friends from Delhi . I saw some good looking 15 inch drivers made locally ( a few years ago !) . So hasn't anyone seen them now and tried them out. If I remember correctly they were priced about 2,000 bucks ( $50) each at that time. They did look quite neat . No idea about performance as the shop keeper had no data on them. Cast frame, bluish cone , rubber surround . I think the cones etc. were sourced from Taiwan.
Anyone from Delhi been to the local electronics parts market recently . JP, Smith....anyone ?
SoundsGreat: You can measure the TS parameters using a simple setup and calculating yourself. I used to do this long ago. Just search on this Forum or on Google and you will find plenty to pick from. No need to buy anything . You can use your computer sound card and a multi meter and some small bits and pieces.
Anyone from Delhi been to the local electronics parts market recently . JP, Smith....anyone ?
SoundsGreat: You can measure the TS parameters using a simple setup and calculating yourself. I used to do this long ago. Just search on this Forum or on Google and you will find plenty to pick from. No need to buy anything . You can use your computer sound card and a multi meter and some small bits and pieces.
Maybe someone can give a link to download " LS-PARAM.XLS " or post the file itself.
Anyone ?
Edit:
Here you go . Links to methods to measure and the XLS file
http://www.epanorama.net/documents/audio/speaker_parameters.html
http://sound.westhost.com/tsp.htm
http://sound.westhost.com/ls-param.zip
Anyone ?
Edit:
Here you go . Links to methods to measure and the XLS file
http://www.epanorama.net/documents/audio/speaker_parameters.html
http://sound.westhost.com/tsp.htm
http://sound.westhost.com/ls-param.zip
I know about peerless very well.
This is a story before 8 years.
The sales manager was my friend from a taiwanese company who gave peerless consultancy about production & were supplier of cone. So i know very well about peerless. I picked up those taiwanese from outside of export processing zone in mumbai when they came to visit peerless.
I hv visited many suppliers in mumbai making speaker spares who were also supplier to peerless.
Peerless is only selling their cheap drivers in India.
I hv visited their factory in andheri epz long back.
i also didn't got proper response from them in spite of asking quantity, i decided to import.
I am now getting few drivers made as per my requirements for pro use.
But to get drivers developed as per our requirement is not a big thing but to buy them in bulk is a big thing. Some usa manufacturer also give u 100 pcs. as per ur requirement, but the cost is very high.
It is nice/surprising to see that the DIY persons who hv money, they import speakers because they don't get good response from good driver manufacturer in India.
Then DIY who can't afford can only ask for cheap drivers.
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