Wiring Diagram for "9" 8ohm loudspeakers

[sdep777]

This is how to wire the original Bose 901 for 9 full range 8ohm loudspeakers with a final impedance of 8ohm.

Enjoy,
Steve

[nick29498141]

Thanks?

[sdep777]

That was from the Bose Corp. Original Document.
Have tons more info on the 901, Patents, Reviews, Cad Drawings, Technical Papers. I have built at least 8 pair over the years pattered after the series 3 look.

Steve ~

[Wolf]

That was from the Bose Corp. Original Document.
Have tons more info on the 901, Patents, Reviews, Cad Drawings, Technical Papers. I have built at least 8 pair over the years pattered after the series 3 look.

Steve ~

I am going to side with Nick here. You see the thing is, most of us loathe Bose products for being outrageously priced, poorly performing, and cheap in terms of build-quality.

The thing with the old 901 is that it has no top-end treble, it desperately needs a tweeter. The bass is bloated, and does whistle through the venturi-vents in the cabinets at higher output levels.

And to close for my 2c on this-
I don't care,
Wolf

[sdep777]

If You don't like the Bose 901 design ..Fine

But if You want to Trash it, Don't bother Posting. No one will be impressed with a Post that knocks a Persons Project of interest, It's a waste of time.

[Wolf]

If You don't like the Bose 901 design ..Fine

But if You want to Trash it, Don't bother Posting. No one will be impressed with a Post that knocks a Persons Project of interest, It's a waste of time.

Trashing your project? I did nothing of the sort. I was stating the general consensus for this particular speaker. Some of it is factual, and has been measured before, and opinions have been validated by others. I was trying to say that you won't get far with a Bose project on this forum, as it is not what we strive for: realism.

Did you post any pictures? No. I cannot say you did well with the finish or the aesthetics. We all like pictures.

All you have posted is about a Bose wiring schematic, a Bose type of speaker, and that you've repeated this more than once. You aren't even realizing how the schematic works, or what is happening in the design, and that is part of the fun.

I'm not a discourager, and usually help a lot of people out on this forum, so I don't know what you're all fired up about.
Later,
Wolf

[sdep777]

I posted this Wiring Diagram for People who are interested.
I would prefer to have responses from people who want to discuss this design,

So if You have an interest Please Post Otherwise. DON'T BOTHER.

[greysplash]

Did they have to ban Vas so soon?? This would have been funny

[Wolf]

I posted this Wiring Diagram for People who are interested.
I would prefer to have responses from people who want to discuss this design,

So if You have an interest Please Post Otherwise. DON'T BOTHER.

I am discussing the design, can't you take constructive criticism? Pointing out flaws does not mean I am calling it terrible.

If you are talking about interest for some buying these from you or potential buyers, please post in the "for-sale" part of the forum.

The wiring diagram in itself is rather simple, and easy to figure out without even having the schematic.

However, the way Bose did it, it's power response is dependant on *which* driver is on the front, and in fact is an imbalanced power-taper with an odd number of drivers in this arrangement. The better arrangement would be a single driver on the front, in parallel with the rear 8 drivers in series, netting a 7 ohm impedance, and keeping the power-taper in check.

I can understand if you think I'm trashing your design, but in fact, I'm just pointing out some short-comings, and possible improvements.
Later,
Wolf

[HareBrained]

Did they have to ban Vas so soon?? This would have been funny

What makes you think he's not here?

[rudyjakubin]

That was from the Bose Corp. Original Document.
Have tons more info on the 901, Patents, Reviews, Cad Drawings, Technical Papers. I have built at least 8 pair over the years pattered after the series 3 look.

Steve ~

What drivers did you use?

[sdep777]

I used Pioneer 4.5" A11ec80-02F . Did them in sealed cabinet . I have been out of this hobby for several years, but I am looking at doing a 8" driver version or 6.5" version, I am really glad to see all the choices of drive units available.

I always like the design and the science that went into these speakers,but always felt Bose did a total injustice by building them cheap and out of plastic. anything to raise the bottom line on the P&L Statements.

[rudyjakubin]

I used Pioneer 4.5" A11ec80-02F . Did them in sealed cabinet . I have been out of this hobby for several years, but I am looking at doing a 8" driver version or 6.5" version, I am really glad to see all the choices of drive units available.

Funny this thread popped up. I was looking through the Buyouts on PE's site the other day and found these drivers.
http://www.parts-express.com/pe/show...number=299-160
And thought that these would make a great 901 with a compliment of Piezo tweeters, although I'd probably have all 8 face me than the wall.
Did the Xmax on the Pioneers hinder it's performance?

[sdep777]

That would probably work with the tweeter , One thing I have liked about this design is these are all Full range drivers no crossover at all, keeping it simple hence the closed box preference . I used 1" mdf for the baffles and 3/4" for the top sides and bottom. approx .85 internal box volume. At the time I lived near MENISCUS Audio in Mi, and he was a big help, I just wanted to build an Audiophile version of this design. He even had them in his shop at one time. back then my only real Driver choices that made any sense were the Pioneer a11ec80-02f or 4.5" tonnagen (if that is spelled right) and I used both , but stuck with the pioneer.

Now I am looking for 6.5" or 8" Pro Dual cone loudspeaker (not coaxial) with an EBP of around 80-90 or less as I prefer the Closed box. an spl of 92 or better and 25 watt rms or better rating. been looking at Visaton and Atlas.

I used the White Instruments 1/3 Octave pro EQ and found it to do the job with less boost than I was expecting. This time I am using Sony's SONNOX VST EQ a 5 band Parametric Plug-in that is on my Computer. These are also used in Studios and if it is good enough for Studio's to use then I tend to trust it more.

[lunchmoney]

If You don't like the Bose 901 design ..Fine

But if You want to Trash it, Don't bother Posting. No one will be impressed with a Post that knocks a Persons Project of interest, It's a waste of time.

I gotta agree with sdep777 here... Wolf's response was needlessly harsh, particularly the "I don't care" comment (if you don't care, then why did you post?)... perhaps Wolf didn't intend it to come out that way.

Reminds me of a response I got on another forum regarding bracing my Tritrix cabinets... it was to the effect of "Why bother, you're making crap speakers using garbage drivers anyways"...

This isn't quite as harsh, but along the same lines.

Constructive critiquing is one thing... slamming the entire endeavor because you don't think it's a worthwhile project is something else altogether.

[brianpowers27]

I love this forum because the people here are real. It is often very challenging to come across in writing with the same casual demeanor that one has in person. I have unintentionally offended other people in email and various written communications more often than I care to admit.

I am sure that you will find Wolf to be a great asset.

[Æ]

I gotta agree with sdep777 here... Wolf's response was needlessly harsh, particularly the "I don't care" comment (if you don't care, then why did you post?)... perhaps Wolf didn't intend it to come out that way.

Reminds me of a response I got on another forum regarding bracing my Tritrix cabinets... it was to the effect of "Why bother, you're making crap speakers using garbage drivers anyways"...

This isn't quite as harsh, but along the same lines.

Constructive critiquing is one thing... slamming the entire endeavor because you don't think it's a worthwhile project is something else altogether.

You exaggerate! Wolf supplies endless amounts of help/suggestions. Nothing wrong with a little bit of critique. Besides many if not most of us here don't really want to hear about BOSE.

[sdep777]

Not a problem I can see by his post history, he IS of great help and knowledge and seems very selfless from the prior posts that I have read. Just did not like the I don't care part of that post.

Steve ~

[Motorman]

I listened to some 901's once.

That was enough.

[lunchmoney]

You exaggerate!

Perhaps... and perhaps Wolf didn't intend for his post to come out the way it did, as I already mentioned.

I've never known Wolf to be anything other than extremely helpful, and we all know that it's easy to misinterpret the tone of a blog, so I'm guessing the tone was unintentional.

But nonetheless I still understand why the original poster was ticked off... that's all I'm saying.