Should I say Goodbye?

[Kevian]

:sos:Yesterday...my wall unit construction was over and moved my A/V equipment too...after setting up everything tried 300 movie...saw a few action sequences and felt something in the sound was lacking and decided to fix it in the morning as I was really tired....Now I've put Black Hawk Down and sound was really lacking and one sided....observed that the speaker wire which was screwed into black point was also in contact with the red point.....my spine went cold...immediately swapped the speakers......put my ear close to the speaker...only tweeter was working...midrange and passive radiator doesn't function...while other speaker is doing good...I think midrange and radiator has gone kaput:sad::sad:

speaker is Definitive Technology Promon 800 Bookshelves.

Is it gone or any chance of bringing it back to "sound"?
any tips? any speaker repair centers in Hyd?

Thank you...

 

[srinisundar]

Venk!!!

Thought by reading the title of your thread,, you are saying goodbye to forum:lol:

Sorry will comment fully after reading your post about your queries

 

[entsurgeon]

If the failure wasn t accompanied with any burnt rubber smell, theres a fair chance that ur power amp shorted a single carrier wirethereby stopping the mid n sub to work as also, luckily preventing ur speakers to get deep fried.;
opening and inspecting the unit may reveal a loose dangling wire soldering which may get things to pre-fry era.
alternatively the crossoverz capacitor/component may have fried up. be careful abt where and what components go into iut as replacement. we ppl dont spend this big packet for any sound. it has to sound like its meant t be. i ve no idea abt hyd.
and yes, me though u d bid fare to forum too.!!

 

[spirovious]

Venk!!!

Thought by reading the title of your thread,, you are saying goodbye to forum:lol:

Sorry will comment fully after reading your post about your queries

Even I thought the same...

 

[Kevian]

Wanted to keep the title little catchy but relevant to my problem...so that I can get more responses...I am so young in experience, equipment, age and knowledge...where will I get the ego from to quit this forum?hyeah: lucky you see.

Anyways..back to my problem...I tried to open the speaker but failed...any pointers please relevant to the problem???

 

[Kevian]

If the failure wasn t accompanied with any burnt rubber smell, theres a fair chance that ur power amp shorted a single carrier wirethereby stopping the mid n sub to work as also, luckily preventing ur speakers to get deep fried.;
opening and inspecting the unit may reveal a loose dangling wire soldering which may get things to pre-fry era.
alternatively the crossoverz capacitor/component may have fried up. be careful abt where and what components go into iut as replacement. we ppl dont spend this big packet for any sound. it has to sound like its meant t be. i ve no idea abt hyd.
and yes, me though u d bid fare to forum too.!!

Thanks for the reply doctor saab....when switched on...no burning smell...so I assume it didn't fry the speaker..just lack of midrange and bass...I am so worried about the underlined part...lots of sacrifice and efforts went into carrying these bookshelves from US to India:sad:

 

[pdhanwada]

what amp were you driving it with.

Try to run another pair of speakers with the same amp To check if the AMP is ok.

Usually, Amps have protection circuits. If any extra current more than anticipated is drawn from AMPs , they themselves shut down preventing the speaker damage.

Is that kind of protection circuitry not in you AMP.

Thanks
Pandu

 

[Kevian]

Thanks bro....thats a valid point to think over..:indifferent14:

I use Onkyo TX SR606 US Version used with 2kv step down transformer

 

[jagmarg]

Thanks bro....thats a valid point to think over..:indifferent14:

I use Onkyo TX SR606 US Version used with 2kv step down transformer

This model has the built-in amp protection circuit which gets activated when running low/high impedance speakers for long time at high volumes. Not sure if that would have helped with the wires short. Hope for the best !

 

[vivek.saikia]

Are these speakers bi-wirable? If yes, then check out the connecting link which connects the HF and LF terminals together when driven by a single amp.

 

[vivek.saikia]

Are these speakers bi-wirable? If yes, then check out the connecting link which connects the HF and LF terminals together when driven by a single amp.

Just found out that these are not bi-wirable......so suggestion taken back

 

[Kevian]

no worries vivek...thanks for your reply...I've contacted deftech folks@maryland by email. They are willing to send the parts to my sister's place in US from where it'll be carried to hyd. My speakers are under warranty so everything would be free. My intention to post this info here is to gather some knowledge if the parts being sourced is all I need or is there something else I need to mind about. I also tried to open the speaker but failed utterly...its not opening at all....unfortunately and funny it is....that everybody is busy creating polls and threads to discuss or not to discuss non-av topics..while my av related thread has got many views but few genuine takers...:lol:

DIY folks onboard this forum....please help me to figure this out....

 

[Kevian]

While I share my worries with my fellow forum mates..I should also share my happiness when my wall unit project got finished...I have designed this after 3 weeks of research on various italian and modern designs....though its not up to my expectations it'll last for atleast 10 to 15 years guaranteed by my carpenter....may be in future I'll have those laminates covered with veneer finish....but thats after I am done with 5.1 setup.

Here are the pics:

Picasa Web Albums - Shooter

with Marcus Aurelius

Picasa Web Albums - Shooter

and not so full rack...hoping to fill it up some day.

Picasa Web Albums - Shooter


I know that those speakers are wrongly placed...but my mistake made them sit there ...should have been more careful...they would have been on a nice wall brackets by now:sad:

 

[Kevian]

okay folks....before I have started this thread...I emailed DefTech..and got a response today morning. The person seems to be very helpful. He offered me to send a set of 4.5 " drivers to my sister's place in US. He also gave me directions of how to open the front baffle of the speaker. Now I have detached and separated the 4.5" driver. He writes the following in his email

It is extremely rare for the crossover network or tweeter to go bad in this speaker. If you hear the tweeter playing (and it should sound very tinny), I am sure the tweeter and crossover are okay.

I told him that I can hear tinny noise and hence tweeter is functional. I see a pair of connectors going to tweeter the same way done to mid range driver from PCB. So from this PCB, 2 pairs of connectors are extended. 1 pair for tweeter and the other pair to midrange. In my case tweeter is doing good. Does this mean crossover is also good? Should I take it for granted that crossover is safe too?

apart from this...I would like to experiment:licklips: on the detached midrange driver(pretty heavy for 4.5" one)...can any DIY folks suggest something? I am based at Hyderabad. I can come visit your place if its fine and interesting for you.

will update as things proceed further.

 

[arj]

very strange that it is the speaker which is impacted. usually the amp is what is "Shorted"

have you tried exchanging the speakers ie interchanging your left and right speakers to see if the problem still remains with the speaker ?

 

[vivek.saikia]

I see a pair of connectors going to tweeter the same way done to mid range driver from PCB. So from this PCB, 2 pairs of connectors are extended. 1 pair for tweeter and the other pair to midrange. In my case tweeter is doing good. Does this mean crossover is also good? Should I take it for granted that crossover is safe too?

apart from this...I would like to experiment:licklips: on the detached midrange driver(pretty heavy for 4.5" one)...can any DIY folks suggest something? I am based at Hyderabad. I can come visit your place if its fine and interesting for you.

will update as things proceed further.

I would really have loved to see the pictures of that operation

 

[Kevian]

very strange that it is the speaker which is impacted. usually the amp is what is "Shorted"

have you tried exchanging the speakers ie interchanging your left and right speakers to see if the problem still remains with the speaker ?

Thanks Arj for responding.....I did interchange the speakers between left and right channels. To which ever channel the damaged speaker is connected...I here only tweeter...no midrange..no bass

like when I setup this thing on my wall unit.....I remember...avr when turned on plays the music for 1 or 2 mins and red light on the avr blinks and shuts down...this happened twice...then I changed the binding posts of the speakers to banana plugs...but I was late already:sad:

 

[vivek.saikia]

Thanks Arj for responding.....I did interchange the speakers between left and right channels. To which ever channel the damaged speaker is connected...I here only tweeter...no midrange..no bass

like when I setup this thing on my wall unit.....I remember...avr when turned on plays the music for 1 or 2 mins and red light on the avr blinks and shuts down...this happened twice...then I changed the binding posts of the speakers to banana plugs...but I was late already:sad:

I would suggest you one thing. Open up the damaged speaker (lets call it A) and disconnect the woofer from the crossover network. Now connect any other speaker (you can use the other speaker, lets call it B) you have, to the woofer output from the crossover A. If the speaker B plays well with only bass, then you can conclude that the woofer A has gone bad and needs a replacement. On the other hand if there is no sound thorugh the speaker B then it will infer that the crossover A has gone bad.
And yes, while doing all these experiments, keep taking lots of pictures and post over here.
Hope this will help you in locating the area of fault.

 

[Kevian]

I would suggest you one thing. Open up the damaged speaker (lets call it A) and disconnect the woofer from the crossover network. Now connect any other speaker (you can use the other speaker, lets call it B) you have, to the woofer output from the crossover A. If the speaker B plays well with only bass, then you can conclude that the woofer A has gone bad and needs a replacement. On the other hand if there is no sound thorugh the speaker B then it will infer that the crossover A has gone bad.
And yes, while doing all these experiments, keep taking lots of pictures and post over here.
Hope this will help you in locating the area of fault.

Excellent Vivek.:clapping:...this is the kind of advise I was looking for...I'll do it today and post the results with pictures...

any word of caution so that I don't fry my B speaker's components?

 

[vivek.saikia]

Excellent Vivek.:clapping:...this is the kind of advise I was looking for...I'll do it today and post the results with pictures...

any word of caution so that I don't fry my B speaker's components?

Keep the volume down and don't ever short the terminals. These precautions will prevent any damage to your speakers as well as the amplifier.