2 Yamaha S6115 bins, only one JA-3882... Help! - diyAudio
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Old 7th September 2012, 12:50 PM   #1
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Default 2 Yamaha S6115 bins, only one JA-3882... Help!

Ok, here's my problem:

I recently inherited a pair of Yamaha S6115 bass bins. One of them had a blown speaker (from a poorly connected lead wire) which was a 15" Eminence driver. Being a reasonable person, I assumed that both drivers had been replaced with Eminence drivers, and I spent some time searching around on the internet looking for a re-cone kit.

In this search, I discovered that there were no markings on the speaker I had (the only way I knew it was an Eminence driver was from the previous owner and the voice coil size), so I opened up the other enclosure to find a model number.

Much to my surprise, I discovered the other enclosure still had it's ORIGINAL JA-3882 driver intact! Hooray! Now all I had to do was find another JA-3882 to slap in there, and off I'd go!

Well, it's never as easy as it sounds. I've had these for 6+ months, all the while searching in vain for another JA-3882 driver. I've found limited information on the enclosures and speakers, and none for sale.

So, if anyone has an idea where I could find a 3882 driver (Not a 3882b) I'd greatly appreciate the info. Yamaha has been of very little help, and ebay is dry as a bone on these.

Help me!
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Old 7th September 2012, 05:40 PM   #2
NEO Dan is offline NEO Dan  United States
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Technology has marched on, you might consider replacing both drivers with something new.
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Old 7th September 2012, 05:43 PM   #3
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Bummer. I was hoping to return to factory spec.

What would you recommend I replace them with?
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Old 7th September 2012, 06:00 PM   #4
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Measure the T/S specs of the original, find a good Eminence replacement, they have versions now that handle beaucoup more powah!

Not familiar with the bass bin - folded horn or reflex?

Model the reflex/ported in any sim software, the tradeoffs in T/S specs will become apparent.

Hornresp will do horns...

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Old 7th September 2012, 08:05 PM   #5
NEO Dan is offline NEO Dan  United States
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It's a hornflex
Click the image to open in full size.
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Old 7th September 2012, 09:48 PM   #6
tb46 is offline tb46  United States
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Default Compound Horn

Hi,

I like "hornflex". You can simulate it in Hornresp as CH (compound horn), see example attached:

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File Type: jpg LAB15_compound.jpg (36.0 KB, 101 views)
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Old 7th September 2012, 10:06 PM   #7
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Yeah, the problem with this design is two-fold.

First the box volume is too low for low tuning. It's a parsed down volume compared to an Altec A7. So you want a low VAS driver, with a low Fs in all probability (see what the sim program says).

The other problem is that the front loaded horn will pick up the response, and create a rising response, guessing on this one rising up from about ~100Hz.

That makes the bass seem a bit lost, but gets the unit up in sensitivity to meet the horn a bit better.

The idea behind the A7 was speech intelligibility not good bass. They did not have good bass, still don't. (redesigned with different drivers and tuning you can get some, at the expense of SPL/sensitivity...).

Just be aware of the tradeoffs, the design idea, and the limitations.

_-_-bear


PS. if you want to EQ the bass, you need a driver that will handle big watts, and need to use a big watts amp, if ur using it for PA/SR
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Old 8th September 2012, 12:45 AM   #8
NEO Dan is offline NEO Dan  United States
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Does bear poo in the woods on an A7?

Seems like a load of unqualified poo to me bear?
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Old 8th September 2012, 12:54 AM   #9
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How so NEO Dan?

You have seen my A7 redesign here? A search might find it. There was a pic posted...

...What I am saying is pretty darn accurate about the A7, if you have some other thoughts, let's hear 'em!

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Old 8th September 2012, 03:29 AM   #10
tb46 is offline tb46  United States
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Hi bear,

The LAB15 allows for a smaller BR volume, do you think it would be suitable here?

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