Hi Rick,
Thanks for the suggestions. It was only drawing that much current then. I haven't calculated what the voltage drop would be across the NTD4906. I do have a few spares.
So if it was damaged...it might explain why I was having difficulty after that.
Also, in one of MJs earlier posts, I did put a 1k resistor in parallel with the 4K7 resistor. I think it ends up being something like 825 ohms there. Not battery operated and it does help the trace to show up.
Recall, that transformer is a 500V unit which supplies current for 7 12ax7a's operating at 12.6V is 150mA each. So 150mA x 7 = 1,050 mA. Designed for a little more juice then driving smaller chips. This is only a pre amp and not an Amp amp. I don't even know if that makes sense.
Cheers,
Thanks for the suggestions. It was only drawing that much current then. I haven't calculated what the voltage drop would be across the NTD4906. I do have a few spares.
So if it was damaged...it might explain why I was having difficulty after that.
Also, in one of MJs earlier posts, I did put a 1k resistor in parallel with the 4K7 resistor. I think it ends up being something like 825 ohms there. Not battery operated and it does help the trace to show up.
Recall, that transformer is a 500V unit which supplies current for 7 12ax7a's operating at 12.6V is 150mA each. So 150mA x 7 = 1,050 mA. Designed for a little more juice then driving smaller chips. This is only a pre amp and not an Amp amp. I don't even know if that makes sense.
Cheers,
Without measurements you are taking a shot in the dark as to optimum enclosures. There are no T/S given, and the manual gives no clue.
Best guess, like many car speakers, these ar emeant to be put into a fairly large leaky space, with a highish Q to give some semblance of bass.
dave
Best guess, like many car speakers, these ar emeant to be put into a fairly large leaky space, with a highish Q to give some semblance of bass.
dave
Note that since these ar enot full range, but multi-way this thread is moving forums.
dave
diyAudio Moderator
dave
diyAudio Moderator
Doesn't look to have enclosure only drywall mounting between rafters . More like a in-wall OB type system.
As mentioned earlier, these are for my home theater. ceiling speakers would be mostly ATMOS or DTS X and i will have a Sub woofer possibly a Rythmik LV12x, i am only looking to get most of these ceiling speakers.
I agree with planet10 that no specific information is provided in the spec sheet, the only understanding from me is the Back box suggestion in the specs sheet "https://www.jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dw46ea0035/pdfs/JBL_Arena_Series_Spec_Sheet_English.pdf"
If any one have previously did an enclosure for this will be of a great help to me.
I can simply install them to False ceiling and use my SUB to take care of all low frequency, but i want to use them to the fullest. though it is rated from 38Hz to 20 KHz, i will be using my SUB under 80HZ anyway.
Hope this gives more information on my requirement in building an enclosure
I agree with planet10 that no specific information is provided in the spec sheet, the only understanding from me is the Back box suggestion in the specs sheet "https://www.jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dw46ea0035/pdfs/JBL_Arena_Series_Spec_Sheet_English.pdf"
If any one have previously did an enclosure for this will be of a great help to me.
I can simply install them to False ceiling and use my SUB to take care of all low frequency, but i want to use them to the fullest. though it is rated from 38Hz to 20 KHz, i will be using my SUB under 80HZ anyway.
Hope this gives more information on my requirement in building an enclosure
Your link was bad..........
The FBB6C is a small, ventilated box with large slots in back, so size is moot and confirms it's a typical in-ceiling PA speaker, so at most, all you need to do is loosely cover with cheesecloth or similar and loosely drape some ceiling insulation over it to protect from dust, bugs or if you want a cab, then the historical 2 ft^3 sealed PA standard is my recommendation and stuff to 'taste'.
REVEL FBB6C - Revel
GM
- Status
- Not open for further replies.