Bose 501 Series 3 woofer re-placement

[GrievousAngel]

Hello All,

I am looking for (2) 10" woofers, not sure of woofer Z. The Bose 501 Series 3 OEM woofers appear to be: 4" VC and 4" mesh-like VC dust over, OA diameter = 10-1/16", 9" to outside edge of surround foam, paper cone w/ textured-backside, 1/2" card-board mounting pad w/ 8 equally spaced mounting holes, stamped steel frame, small magnet motor.

Bose 501 Series III; SN: 284808; Model: 111791, Part 2 Right/Left; stamped in magnet: 18 83. The cabinet is rated at 8 ohms total impedance.

Looking for suitable replacement woofer. Does not have to be Bose OEM woofers.

Thanks,

grievousangel.wtj@gmail.com

[AMC]

The bose product are just different enough, you should stick with the bose brand if you want them to sound the same.

There are some 'rebuild' kits (new surrounds) available, might be worth a try.

Outside of that, look for an 8 ohm woofer that seems to like you box size, something with a low Qts and good sensitivity, if I recall correctly.

PS, And buy 2, you should replace both.

[GrievousAngel]

Which woofer would you recommend from PE listings?

I notice your image of a guitar with your login info. Are you a player? I played for years, recording and live sound engineer too.

Thanks for the help.

William

[mikejennens]

I don't know for sure, but this might help

http://www.parts-express.com/resources/woofer-selection-guide.cfm

I have a set of 501s (circa 1978?) on which I just had the woofers re-foamed. If you want, I can put them on my WT-3 and let you know what I get. That might help you know what to look for in a replacement. I'll probably get them back this weekend.
Mike

[GrievousAngel]

Great idea! Thanks. Let me know when done. William

[mikejennens]

Great idea! Thanks. Let me know when done. William

William,
Do you have a WT-3? If so, I'll send you the actual WT-3 file. If not, here is the info I got:
R(e)- 3.971 ohms
F(s)- 32.97 Hz
Q(ts)- 0.9273
Q(es)- 1.22
Q(ms)- 3.861
L(e)- 10395 mH
M(ms)- 4.42 grams
V(as)- 0.00356 cu ft

Sorry it took longer than I thought it would, but I just dug out the computer I run the WT-3 on and the WT-3 this morning.
I hope it all helps.
Mike

[CUtiger]

William,
Do you have a WT-3? If so, I'll send you the actual WT-3 file. If not, here is the info I got:
R(e)- 3.971 ohms
F(s)- 32.97 Hz
Q(ts)- 0.9273
Q(es)- 1.22
Q(ms)- 3.861
L(e)- 10395 mH
M(ms)- 4.42 grams
V(as)- 0.00356 cu ft
Sorry it took longer than I thought it would, but I just dug out the computer I run the WT-3 on and the WT-3 this morning.
I hope it all helps.
Mike

That looks really weird to me :confused:

[mikejennens]

Oops...
The L(e) should be 1.392. I don't know what's up with the V(as). I measured several speakers and the V(as) is screwy on all of them. I'm wondering if I input something wrong on each speaker. The only thing I could have input incorrectly is the piston diameter. I put 1.5 inches for this woofer. The piston isn't the complete cone of the speaker is it?
Thanks,
Mike

[CUtiger]

Just checking, I passed a kidney stone today and the pain pills are making a lot of things look weird.

The piston is the cone, I'm guessing you were using the VC diameter? Also 13.92 is still very high inductance, more than anything I have seen but given it is a Bose OEM and older design I guess it's not impossible.

edit: sorry 1.392 is pretty reasonable, did I already mention the pain pills ;)

[isaeagle4031]

Generally measure from the half way point of the surround to the opposite edge.

[mikejennens]

So, by cone you mean the part that actually moves (the paper, nomex, aluminum, etc. part) correct? I know that seems like a pretty goofy question, but I guess I don't know for sure, so I need to ask. :o
Thanks,
Mike

[isaeagle4031]

Yep, the cone is where its at:)

[mikejennens]

Generally measure from the half way point of the surround to the opposite edge.

So, I still need to ask a somewhat embarrassing question... Do you follow the contour of the cone, or is just going from the surround as you mentioned good enough.
Thanks again,
Mike

[cjd]

It needs to know the effective diameter of the circle that moves air; Though the cone is not flat, the resulting swept volume exactly matches a cylinder based on the circle as measured from the surround.

So, don't follow the contour. :)

[mikejennens]

It needs to know the effective diameter of the circle that moves air; Though the cone is not flat, the resulting swept volume exactly matches a cylinder based on the circle as measured from the surround.

So, don't follow the contour. :)

Sounds good. Thanks for the explanation. It definitely makes sense now.

[GrievousAngel]

Hello,

I'm back asking about my friends Bose 501 replacement woofers!


1. Are the OEM woofers available from Bose still? I think they sold for ~ $40.00 ea. a few years back.
2. Where is a good re-coning service for the 501 woofers?
3. For under $30.00 ea, which replacement woofer listed on PE would you get?
4. Under $75.00 ea?


Thanks,
Billy

[2leftthumbs]

I dont have personal knowledge if this is true or not, but one of the reviews of the dayton classic 10" woofer says it is a drop in replacement for the bose 501.http://www.parts-express.com/pe/showdetl.cfm?Partnumber=295-315

[bangleiii]

Just checking, I passed a kidney stone today and the pain pills are making a lot of things look weird.

The piston is the cone, I'm guessing you were using the VC diameter? Also 13.92 is still very high inductance, more than anything I have seen but given it is a Bose OEM and older design I guess it's not impossible.

edit: sorry 1.392 is pretty reasonable, did I already mention the pain pills ;)

It's a four layer vc about an inch in dia.. There's a lot of wire and it's a heavy VC.