Mekasonic drivers
Hey Surankan,
Please let us know if Mekasonic is still around in Kolkatta??Where is there new address?? Do local shops there stock Mekasonic??
Patrick
Hey Surankan,
Please let us know if Mekasonic is still around in Kolkatta??Where is there new address?? Do local shops there stock Mekasonic??
Patrick
Artuculated Array Design
Suranjan, is it possible for you to send me details of the Bose Articulated Array Design - what is it? Has Bose put that in open source yet? Illustrations, diagrams preferred. I am very curious to know what this design is?
By the way someone here in town mentioned Mekasonic is still around and kicking. How true is that??
Pat
Suranjan, is it possible for you to send me details of the Bose Articulated Array Design - what is it? Has Bose put that in open source yet? Illustrations, diagrams preferred. I am very curious to know what this design is?
By the way someone here in town mentioned Mekasonic is still around and kicking. How true is that??
Pat
Check this out http://www.diyaudio.com/forums/showthread.php?threadid=28526
More suggestions/ advice welcome.
More suggestions/ advice welcome.
hi
i am interested in marketing my drivers therefore info about other co s will be biased yet i can tell you that mekasonic is more or less dead and most are copies that are being sold
anyway dont worry about mekasonic hear mine you ll be impressed ,
prior coming to cal please mail my dealer to keep aside the drivers you would like to hear of mine ill send you his email over the weekend
though he is reciving a batch of 200 now i dont know how long that will last
as for the bose - frankly speaking i am not impressed by bose
most of the people i have met who are impressed of bose have heard noting less like the turtles in the same well
whatever their array is is a copy of myers array - who have introduced the concept of arrays to the world
since they have been so successful and there is a good demand for them i am sure bose has therefore decided to join the band wagon
if myers is out of reach , jbl and ev s have powered arrays too
these arrays depend on a combination of flying tops and dedicated subs for large scale soundreinforcement
check out myers site on arrays their patents and research on the subject you will get a lot of information on it
suranjan
i am interested in marketing my drivers therefore info about other co s will be biased yet i can tell you that mekasonic is more or less dead and most are copies that are being sold
anyway dont worry about mekasonic hear mine you ll be impressed ,
prior coming to cal please mail my dealer to keep aside the drivers you would like to hear of mine ill send you his email over the weekend
though he is reciving a batch of 200 now i dont know how long that will last
as for the bose - frankly speaking i am not impressed by bose
most of the people i have met who are impressed of bose have heard noting less like the turtles in the same well
whatever their array is is a copy of myers array - who have introduced the concept of arrays to the world
since they have been so successful and there is a good demand for them i am sure bose has therefore decided to join the band wagon
if myers is out of reach , jbl and ev s have powered arrays too
these arrays depend on a combination of flying tops and dedicated subs for large scale soundreinforcement
check out myers site on arrays their patents and research on the subject you will get a lot of information on it
suranjan
Decent drivers these
I put Dainty 6" drivers in a closed box and they sounded very decent. I was impressed. Same goes for BPL 6". I think a decent two way can be designed around these. Both excel in Bass.
BTW, I went to the Bolton catalog and found coated paper drivers. The spec sheet said that they gave a very natural sound. I will agree b'coz same goes for coated paper drivers from Dayton. Has any body had a chance to use these drivers. I did not take the pain to buy b'coz they had untreated foam surround.
I put Dainty 6" drivers in a closed box and they sounded very decent. I was impressed. Same goes for BPL 6". I think a decent two way can be designed around these. Both excel in Bass.
BTW, I went to the Bolton catalog and found coated paper drivers. The spec sheet said that they gave a very natural sound. I will agree b'coz same goes for coated paper drivers from Dayton. Has any body had a chance to use these drivers. I did not take the pain to buy b'coz they had untreated foam surround.
hi
hey thankx a tonne to tell me about the mdf thing well i checked a few guys out here in jsr .... they do have mdf . any way then i'm using mdf for my next project . hey forgot to tell u guys .... about my last project .... i was working on a passicve sub for my friend's car ... a puny thing but did a great job in his car a Maruti Suzuki Zen. the driver i used was a re made one from an old sonodyne ones of which only the frame and maganets were intact.
well and i did not expect much out of it . i kept it in a ventilayted enclousure. and tested it on my sony hi fi 's speaker out put. i fed it around 3/4th of the total 40w rms and it did not distrote.
my pal is using it in his car for a kenwood head unit ... 40w x 4 channel. my and it does sound great .
hope to post the pics soon.
hey i know it's not a major achivement but it was my first sub. so it's really a thrill.
chalo see yah folks
hey thankx a tonne to tell me about the mdf thing well i checked a few guys out here in jsr .... they do have mdf . any way then i'm using mdf for my next project . hey forgot to tell u guys .... about my last project .... i was working on a passicve sub for my friend's car ... a puny thing but did a great job in his car a Maruti Suzuki Zen. the driver i used was a re made one from an old sonodyne ones of which only the frame and maganets were intact.
well and i did not expect much out of it . i kept it in a ventilayted enclousure. and tested it on my sony hi fi 's speaker out put. i fed it around 3/4th of the total 40w rms and it did not distrote.
my pal is using it in his car for a kenwood head unit ... 40w x 4 channel. my and it does sound great .
hope to post the pics soon.
hey i know it's not a major achivement but it was my first sub. so it's really a thrill.
chalo see yah folks
RAVE speakers
Sorry for resurrecting this thread. What caught my attention was Navin’s question about the RAVE speakers available at bazee..
http://www.baazee.com/jsp/BidForm.jsp?Trade_TradeId=24776678
I happen to purchase these from that seller 3 months back. Prior to confirming the order through bazee I gave him a call to check details. Person said would discount 1.5 grand if purchased directly from him rather than going through bazee else he’ll have to pay commission. Sounded a bit shady but thought I’ll take the risk.. Paid 12.5K for the package (minus center speaker).
Said he’ll send by lorry. Was a bit skeptical about the care in handling tru lorry, but seller assured he’s sent many speakers this way and its always packed well.
When these arrived I had the shock of my life. Units were dumped into one single huge cardboard box – the seams have busted and the contents halfway out. All cabinets had deep cracks in them. On testing, found the speakers had absolutely no bass –inspite of having 3 x 5” woofers per channel. Sealed the cracks with synthetic adhesive but it didn’t make any difference. My nephew’s 5.1 Intex multimedia speakers costing Rs 2.5K sounded much better.
No brand name mentioned on the drivers. Seller says its peerless.
The HT Amp was a rip-off. There was distortion in one channel. Brand name –‘HORROR’ – it really stood up for its name. The knobs were cheap plastic, the display had a dummy audio spectrum analyzer, and tonal balance was poor. Opened the amp, and found its just stereo. The 5.1 AC-3 analogue inputs were combined through resistor network and converted to stereo. At the output, surround and center were derived by connecting in series with main L, R Spk Out. (based on hafler principle).
On confronting him all he had to say was there’s no warranty on any of these except for the drivers.
Had a mind to go to consumer court but then thinking about the legal hassles decided to forget it. What’s surprising is this chap seems to have a good +ve rating received at bazee.
So finally I happen to pay the price for sheer stupidity of purchasing a sound system through an auction site trusting the vendor’s expertise.
navin said:
Sorry for resurrecting this thread. What caught my attention was Navin’s question about the RAVE speakers available at bazee..
http://www.baazee.com/jsp/BidForm.jsp?Trade_TradeId=24776678
I happen to purchase these from that seller 3 months back. Prior to confirming the order through bazee I gave him a call to check details. Person said would discount 1.5 grand if purchased directly from him rather than going through bazee else he’ll have to pay commission. Sounded a bit shady but thought I’ll take the risk.. Paid 12.5K for the package (minus center speaker).
Said he’ll send by lorry. Was a bit skeptical about the care in handling tru lorry, but seller assured he’s sent many speakers this way and its always packed well.
When these arrived I had the shock of my life. Units were dumped into one single huge cardboard box – the seams have busted and the contents halfway out. All cabinets had deep cracks in them. On testing, found the speakers had absolutely no bass –inspite of having 3 x 5” woofers per channel. Sealed the cracks with synthetic adhesive but it didn’t make any difference. My nephew’s 5.1 Intex multimedia speakers costing Rs 2.5K sounded much better.
No brand name mentioned on the drivers. Seller says its peerless.
The HT Amp was a rip-off. There was distortion in one channel. Brand name –‘HORROR’ – it really stood up for its name. The knobs were cheap plastic, the display had a dummy audio spectrum analyzer, and tonal balance was poor. Opened the amp, and found its just stereo. The 5.1 AC-3 analogue inputs were combined through resistor network and converted to stereo. At the output, surround and center were derived by connecting in series with main L, R Spk Out. (based on hafler principle).
On confronting him all he had to say was there’s no warranty on any of these except for the drivers.
Had a mind to go to consumer court but then thinking about the legal hassles decided to forget it. What’s surprising is this chap seems to have a good +ve rating received at bazee.
So finally I happen to pay the price for sheer stupidity of purchasing a sound system through an auction site trusting the vendor’s expertise.
if i were u i'd atleast let bazee know.although they are not liable since you dealt directly with the seller they might black list him for the future.
if however u had gone thru bazee thre might have been SOME recourse.
if however u had gone thru bazee thre might have been SOME recourse.
About the Baazee 420 deal
Hello all.
I agree with Navin, and I had a similar experience months ago by dealing directly hoping I'd save something. It was indeed a folly. Anyway Peerless or peerful, one thing is for sure... there's no such thing as a free lunch. I think roshan got carried away with the price and the nice pictures. However recently I have capitalised on a Baazee auction by 'screwing up' one Baazee seller so hard and am contemplating serious legal action for his non-compliance. It was a home theater system and this seller is from Delhi. He put a beautiful black home theater speak system in his ad listing with a remote et al but then contradicted himself at the bottom of the page in microscopic print that the picture is only indicative and that he will send whatever is in stock however with similar features and that too without the remote.
I wrote to Baazee telling them that this is misleading. They replied back saying that his ad is valid and that I should have read the 'fine print'. Anyway so I won the auction although I did not feel good winning anyway knowing that I would get really lousy stuff for a really high price @ Rs.2400 each- thats around 50 pieces of what I presume are crap home theater systems. However I realised later that his ad promised 4000W (approx) of audio. He did not say RMS or PMPO. Ahh this gave me hope. I demanded that I get the power output in RMS for each of the 50 systems that I won as this was made very ambiguous in the ad. He refused saying that it is the norm that PMPO is the rating. I replied back saying the audio industry worldwide do not accept stupid PMPO ratings only RMS will do and is the norm. NOw Baazee and the seller are in a quandary - The seller more. I don't think the seller will deliver the RMS I demanded however considering the Rs.1.2 lakh deal, I have no other option but to take legal recourse if he fails to. I also told the seller, that I will have to test each and every system in Delhi in a Government lab to determine the 4000W RMS from each system.
NOw you guys tell me if I am doing the right thing and whether 50Nos of a 4000W RMS Home theater system at Rs.1.2 lakhs is a cool deal or not.
Patrick
If
Hello all.
I agree with Navin, and I had a similar experience months ago by dealing directly hoping I'd save something. It was indeed a folly. Anyway Peerless or peerful, one thing is for sure... there's no such thing as a free lunch. I think roshan got carried away with the price and the nice pictures. However recently I have capitalised on a Baazee auction by 'screwing up' one Baazee seller so hard and am contemplating serious legal action for his non-compliance. It was a home theater system and this seller is from Delhi. He put a beautiful black home theater speak system in his ad listing with a remote et al but then contradicted himself at the bottom of the page in microscopic print that the picture is only indicative and that he will send whatever is in stock however with similar features and that too without the remote.
I wrote to Baazee telling them that this is misleading. They replied back saying that his ad is valid and that I should have read the 'fine print'. Anyway so I won the auction although I did not feel good winning anyway knowing that I would get really lousy stuff for a really high price @ Rs.2400 each- thats around 50 pieces of what I presume are crap home theater systems. However I realised later that his ad promised 4000W (approx) of audio. He did not say RMS or PMPO. Ahh this gave me hope. I demanded that I get the power output in RMS for each of the 50 systems that I won as this was made very ambiguous in the ad. He refused saying that it is the norm that PMPO is the rating. I replied back saying the audio industry worldwide do not accept stupid PMPO ratings only RMS will do and is the norm. NOw Baazee and the seller are in a quandary - The seller more. I don't think the seller will deliver the RMS I demanded however considering the Rs.1.2 lakh deal, I have no other option but to take legal recourse if he fails to. I also told the seller, that I will have to test each and every system in Delhi in a Government lab to determine the 4000W RMS from each system.
NOw you guys tell me if I am doing the right thing and whether 50Nos of a 4000W RMS Home theater system at Rs.1.2 lakhs is a cool deal or not.
Patrick
If
Thats 0.2MW or 200KW RMS of power
Yes and imagine 200KW or 0.2 MW (Yes Mega) of solid pounding power from 50 Home theater systems with subwoofer, Dolby and all for only Rs.1.2 L. This could blow my little 10' X 10' shop apart.
patrick
Yes and imagine 200KW or 0.2 MW (Yes Mega) of solid pounding power from 50 Home theater systems with subwoofer, Dolby and all for only Rs.1.2 L. This could blow my little 10' X 10' shop apart.
patrick
if anyone advertised 4000W I would have assumed PMPO. your case is weak on 2 counts. few judges know the difference between rms and PMPO, PMPO is the norm in India (check out the ads), if a rating is ambigious it is the buyer's responsibility to clarify the ambigiuty before placing an order.
Bazee should have and could have warned the seller to improve the readibility of the fine print. If u remember recently a large mobile service provider advertised 40 paise per minute. No where on the ads was it mentioned that this rate was only for calls within the provider's network. They beat a PIL on the grounds that when the customer signed up buried in the paper work was a statement that mentioned this "limitation".
Bazee should have and could have warned the seller to improve the readibility of the fine print. If u remember recently a large mobile service provider advertised 40 paise per minute. No where on the ads was it mentioned that this rate was only for calls within the provider's network. They beat a PIL on the grounds that when the customer signed up buried in the paper work was a statement that mentioned this "limitation".
ref wattage
what to look for pror purchase
the following are the fine print i have often noticed regarding wattage
firstly wattage
there are in a broad base 2 types
1 - rms output with a sine wave input
2 - rms output with a music power input
other than high end audio i have found more often than not - music power output is the common source of rating
music power output is not PMPO
music power is often 1.5 to 2 times the sine wave rms output of an amp (depending on the class of operation and output stage)
1) dealing with rms sine wave output
rms output is mostly specified in pro audio
my experience
peavey mentions rms output @ 1 khz (vocal range)
this has a lot of limitations as the max load on the amp and power supply is on when pushing bass
more often than not a peavey amp
rated at 1000 w rms @ 4 ohms bridged @ 1 khz
is actually somewhere around
500 to 600 w rms (bridged) @ 20 hz to 20 khz
this will be printed in their catalogue too but since its such a fine print quite a few over look it
there are pro audio amps like the crest audio pro series which do not fall in this category at all
summing up one should go for the rms - sine wave rating
@ 20 hz to 20 khz
and it may be deceptive when going by 1 khz ratings
2) music power rating
this has quite a few standards IEC 1 to 4
details are avalable in various sites
-what i have summed up along with personal experience is :
wattage rating has been very liberal when rating home theatre amps
even with amps supporting THX logo
what i have found is that mostly 1 transformer supplies 5 channels :- the current sharing is of concern
at any given moment where the main speaker woofer pulls high current
another channel may clip due to most of the current being taken up by the main speakers
clipping is of concern to all amp manufacturers as it will inturn destroy expensive speakers
to avoid clipping these amps have a high speed input to output comparator circuit and when clipping is detected the input is compressed automatically to avoid clipping
in turn limiting output to the speakers
there are ways of counteracting the above effent (by inguniesly placing reservoir caps along the speaker and power supply signal path and aid current sharing , which i have found most companys using) - yet the wattage rating always fall short when all channels are driven
they play loud but a better quality is achieved when pwoering the same set up with discrete amps
PMPO misleads people and is banned in most countries
i dont support it and am waiting the day when its banned in good ol India too !
suranjan
what to look for pror purchase
the following are the fine print i have often noticed regarding wattage
firstly wattage
there are in a broad base 2 types
1 - rms output with a sine wave input
2 - rms output with a music power input
other than high end audio i have found more often than not - music power output is the common source of rating
music power output is not PMPO
music power is often 1.5 to 2 times the sine wave rms output of an amp (depending on the class of operation and output stage)
1) dealing with rms sine wave output
rms output is mostly specified in pro audio
my experience
peavey mentions rms output @ 1 khz (vocal range)
this has a lot of limitations as the max load on the amp and power supply is on when pushing bass
more often than not a peavey amp
rated at 1000 w rms @ 4 ohms bridged @ 1 khz
is actually somewhere around
500 to 600 w rms (bridged) @ 20 hz to 20 khz
this will be printed in their catalogue too but since its such a fine print quite a few over look it
there are pro audio amps like the crest audio pro series which do not fall in this category at all
summing up one should go for the rms - sine wave rating
@ 20 hz to 20 khz
and it may be deceptive when going by 1 khz ratings
2) music power rating
this has quite a few standards IEC 1 to 4
details are avalable in various sites
-what i have summed up along with personal experience is :
wattage rating has been very liberal when rating home theatre amps
even with amps supporting THX logo
what i have found is that mostly 1 transformer supplies 5 channels :- the current sharing is of concern
at any given moment where the main speaker woofer pulls high current
another channel may clip due to most of the current being taken up by the main speakers
clipping is of concern to all amp manufacturers as it will inturn destroy expensive speakers
to avoid clipping these amps have a high speed input to output comparator circuit and when clipping is detected the input is compressed automatically to avoid clipping
in turn limiting output to the speakers
there are ways of counteracting the above effent (by inguniesly placing reservoir caps along the speaker and power supply signal path and aid current sharing , which i have found most companys using) - yet the wattage rating always fall short when all channels are driven
they play loud but a better quality is achieved when pwoering the same set up with discrete amps
PMPO misleads people and is banned in most countries
i dont support it and am waiting the day when its banned in good ol India too !
suranjan
t/s specs for bolton
Hi all,
I just joined this forum recently. I am a new bee in DIY , but am very very interested.
I was searching for the T/S parameters for Bolton Woofers(8') when I came across this thread. It had some mention in th ebeginning about the TS parameters, but it seems to have wandered away from the initial idea.
Could anyne provide the TS parameters for Bolton 8 inch woofers?
Regards,
Linoj.
Hi all,
I just joined this forum recently. I am a new bee in DIY , but am very very interested.
I was searching for the T/S parameters for Bolton Woofers(8') when I came across this thread. It had some mention in th ebeginning about the TS parameters, but it seems to have wandered away from the initial idea.
Could anyne provide the TS parameters for Bolton 8 inch woofers?
Regards,
Linoj.
Linoj, the params for the Bolton 20SBW22 subwoofer driver are free air resonant frequency= 31 Hz, Qms=3.83, Qes=0.65, Qts=0.56, Vas= 27 L.
Vivek
Vivek
Re: t/s specs for bolton
True. if we try to split this thread up we could easily have more than 3 threads some of them might not be in the "Loudspeaker" section at all. however this thread has sort of become a sounding baord for some if not all the indians, PIOs, NRIs on the forum etc.. to exchange ideas.
Ashok (Satpaty) has even got me going on building a tube amp, one day i would love to meet all the indians here. Maybe the thread should be called Vande Mataram for all the topics it covers. 🙂
as long as those 7 foot tall , 17 stone moderators let us get away with this we will. 🙂 Jai Hind!
dumrum said:
True. if we try to split this thread up we could easily have more than 3 threads some of them might not be in the "Loudspeaker" section at all. however this thread has sort of become a sounding baord for some if not all the indians, PIOs, NRIs on the forum etc.. to exchange ideas.
Ashok (Satpaty) has even got me going on building a tube amp, one day i would love to meet all the indians here. Maybe the thread should be called Vande Mataram for all the topics it covers. 🙂
as long as those 7 foot tall , 17 stone moderators let us get away with this we will. 🙂 Jai Hind!
hi suranjan
same here about the PMPO stuff. really it does miss lead people. they have no real relation either. and thanks for the informative things abt rms. well but i have a doubt. few years back in a sony world - thts sony exclusive showrooms. they mentioned that
rms X 11 = PMPO ... i doubt it ... or is it? 😕
same here about the PMPO stuff. really it does miss lead people. they have no real relation either. and thanks for the informative things abt rms. well but i have a doubt. few years back in a sony world - thts sony exclusive showrooms. they mentioned that
rms X 11 = PMPO ... i doubt it ... or is it? 😕
hi
i normally never take to people working in a show room as their max salary will be around 5000/
judging so i doubt they will have any - in depth knowledge of electronis - leaving out anything as complex as
1 recording sound , the levels mediums
2 storage
3 playback
a amps speakers , limitations of the recorded medium
even subjectivly a person reaching the level of tackling these fields above he will not be sitting in a show room - unless it s his own brand and stuff
best is in such situations is :
ask me any qs on audio electronics and mediums to reproduce sound and i will attempt to answear it
and i will ask you 1 qs lets see if you can answear it
- then we can decide as to a sale mans knowledge
recently blaupunkt had a car audio competition
i went - prior to the event with my car , and asked them what their knowledge and competence is to judge my installation
they were breaking sweat
got me connected to their office in delhi
and the guy at the other end after having nothing worthwile to prove of - his knowledge
told me to look at blaupunkts innovative designs ets.
my answear which blaupunkt - german yes
but in india its a traders paradise
we should congratulate blaupunkt for successfully marketing chinese products at a very high price through the blaupunkt image
(those from mum will easily verify as palesha has a lot of chinese spk s similar to the blaupunk at 1/2 the price)
i have stayed 5 months in china and know exactly blaupunkts profit margin
once i told this to who ever was on the other end - just hang up
suranjan
i normally never take to people working in a show room as their max salary will be around 5000/
judging so i doubt they will have any - in depth knowledge of electronis - leaving out anything as complex as
1 recording sound , the levels mediums
2 storage
3 playback
a amps speakers , limitations of the recorded medium
even subjectivly a person reaching the level of tackling these fields above he will not be sitting in a show room - unless it s his own brand and stuff
best is in such situations is :
ask me any qs on audio electronics and mediums to reproduce sound and i will attempt to answear it
and i will ask you 1 qs lets see if you can answear it
- then we can decide as to a sale mans knowledge
recently blaupunkt had a car audio competition
i went - prior to the event with my car , and asked them what their knowledge and competence is to judge my installation
they were breaking sweat
got me connected to their office in delhi
and the guy at the other end after having nothing worthwile to prove of - his knowledge
told me to look at blaupunkts innovative designs ets.
my answear which blaupunkt - german yes
but in india its a traders paradise
we should congratulate blaupunkt for successfully marketing chinese products at a very high price through the blaupunkt image
(those from mum will easily verify as palesha has a lot of chinese spk s similar to the blaupunk at 1/2 the price)
i have stayed 5 months in china and know exactly blaupunkts profit margin
once i told this to who ever was on the other end - just hang up
suranjan
Suranjan
You're right.
Blaupunkt has exploited their German brand in the same way the Opel did. The Opel guys talked loudly about German engineering, until someone tok them to court and proved that the engine was imported from their Holdne subsidiary in Australia! The same way, when I upgraded my Astra speakers( of the factory fitted "Blaupunkt stereo system) I found cheap Philips speakers fitted on the rear..Maybe the head unit was made in China!
I now have a Kenwood head unit and Focal audio drivers which is like night and day compared to the OEM stuff.. Maybe Blaupunkt sells asli maal in the US and Europe-I dont know.
George
You're right.
Blaupunkt has exploited their German brand in the same way the Opel did. The Opel guys talked loudly about German engineering, until someone tok them to court and proved that the engine was imported from their Holdne subsidiary in Australia! The same way, when I upgraded my Astra speakers( of the factory fitted "Blaupunkt stereo system) I found cheap Philips speakers fitted on the rear..Maybe the head unit was made in China!
I now have a Kenwood head unit and Focal audio drivers which is like night and day compared to the OEM stuff.. Maybe Blaupunkt sells asli maal in the US and Europe-I dont know.
George
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