Are MW6503's a good replacement for MW6511's?

Fongolio

In a different post I told of my SDA-1C's getting two blown MW6511's. They are no longer available from Polk Customer Service. Doing research I've learned that at one point Polk CS has recommended using MW6503's as a replacement for 6511's. Has anyone here had experience with these as replacemnts to their 6511's? They are electrically compatible (similar impedence ratings) but the 6503 has a stiffer suspension and therefore must voice differently. I can't find any 6511's new or used and must therefore seek alternates and the 6503's appear to be the closest match. Please help.

Kelvin

PS Walter at Polk CS is recommending 6510's to replace 6511's but the 10's are rated 8 ohm and the 11's are 4 ohm. This is NOT the correct replacement. I just want a straight informed answer to what will make a good alternative.

Fongolio

No one? Help!

zarrdoss

for a while I used a 6503 in place of a 6511 in my 2.3's when I finally found a 6511 and changed it out I could not tell a difference at all. I would say go for it and be on the lookout for some 6511's. Is Polk ever going to get any new ones in?

What about 6502's?

ben62670

6502's are 4 ohms.

dorokusai

They all have different parameters but I've used mismatched drivers to get by on more than one occasion. You should find the right one.....

Vette C6.r

Not to get too far off track Fongolio.


Has there ever been any formal writing on what exactly the differences are between all of the MWXXXX's.

I have often wondered this.

Fongolio

Vette C6.r wrote: »

Not to get too far off track Fongolio.


Has there ever been any formal writing on what exactly the differences are between all of the MWXXXX's.

I have often wondered this.

No problem. I'd love to know this answer as well.

helipilotdoug

Fongolio wrote: »

No problem. I'd love to know this answer as well.

Yeah, me too!! I've searched to find the differences, mainly ohm rating of each, but have come up empty handed. Is there a list somewhere?

dorokusai

I'll post the information later. I have it in some emails.

Dawgfish

I blew one of my 6511's on my right SDA-1C. I had a set of RTA-12Bs lying around, so I removed a 6503 MW from one and replaced the blown 6511 with the 6503. I also could not tell a difference in sound between the two. I am still on the lookout for a replacement 6511 (and 6503 for that matter), but until I find one, I'm quite happy running the 6503 as a replacement for the 6511.

Vette C6.r

Thanks Doro.

I think a sticky might be in order.

skrol

I couldn't find the specs for the 6511. Here are the specs for the 6503.

Driver: MW 6503 Driver's model #.
Brand: Polk Driver's brand name.
Fs: 29.8600 Hz (Free air resonance)
Vas: 3.0017 ft^3 (Compliance volume)
Qts: 0.3100 Total Q
Qms: 1.7680 Mechanical Q
Qes: 0.3760 Electrical Q
Sd: 0.0130 M^2 (Piston area)
Xmax: 3.1800 mm (Cone excursion, linear)
Revc: 6.5400 ohms (DC resistance)
Znom: 8.0000 ohms (Nominal impedance)
Pmax: 35.0000 watts maximum rated power

mmadden28

I wonder, would this Dayton WT3 woofer tester be of any value to measure the different drivers? Anybody have any experience with it?

heiney9

dorokusai wrote: »

I'll post the information later. I have it in some emails.

It's here on the forum as well, I hate our search engine but maybe someone bookmarked it.

H9

dorokusai

You are correct Heiney....forgot about that completely. Either way, we should get it stickied, per suggestion, so the basics are known.

I found out some new information about the SL series on the RT55 and etc models that will be useful, awesome, surprising and perhaps not so pleasing to some owners today.

ben62670

mmadden28 wrote: »

I wonder, would this Dayton WT3 woofer tester be of any value to measure the different drivers? Anybody have any experience with it?

I have one and found it useful. All the drivers data is in Georgia. If you go to the parts express forum someone posted their findings on there

Vette C6.r

Any update on this Mark ???

Vette C6.r

Doro did you find the info in those e-mails ???

dcmartinpc

I would like to know this as well. I had a 6511 freeze up on me... From what I can find the 6503 is too high an ohm rating. Based on the info I have found, the 6502 is a closer match to the 6511.

Any more info on this?

Thanks!

Don

Fongolio

Man, is there ever a lot of conflicting information about the 65XX drivers. Someone needs to create a sticky with accurate info on this. I got lucky and zardoss sold me a pair of 6511's but I may not be so lucky in the future and it would sure be good to have reliable information.

dcmartinpc

The info I have found is that the 6503 is an 8 ohm speaker and the 6502 is a 4 ohm speaker.

Don

Face

mmadden28 wrote: »

I wonder, would this Dayton WT3 woofer tester be of any value to measure the different drivers? Anybody have any experience with it?

They work well.

dcmartinpc

You got 2 6511's? Can you explain the screw problem?

Thanks,

Don

Fongolio

Smallies wrote: »

I ordered and recieved 2 mw-11's this month from Polk. Not too much fun to install with the non cutout around the screw deal.

I emailed them two weeks ago and was told they are unavailable!! I'm starting to think the left hand at Polk doesn't know what the right hand is doing!. For a company known for outstanding customer service there sure is a lot of conflicting information coming from them right now, especially concerning the availability of the MW6511's. Can any Polk reps please find out for sure if these drivers are available through Polk? Many people on this forum and I'm sure others would really like a definitive answer. Thank you.

Kelvin

zarrdoss

dcmartinpc wrote: »

You got 2 6511's? Can you explain the screw problem?

Thanks,

Don

the older drivers have cut-outs on the rubber surrounds so the screw does not bind them up. the new ones do not so you have to carefully cut them out or the screw will bind them up and distort the surround or destroy it, here is a pic of the old and new side by side.

As far as Polk CS goes I think calling is always your best bet.

Attachment not found.

dcmartinpc

OK, now I see. First, I realized my question about the pressure not is kind of dumb, because the magnet pulls everything together But.... I do have 2 questions...

1.) I know I may be asking a really basic question, but what epoxy should I use between the magnet and the plate? And how much should I put there. don't want to over epoxy, but want enough to hold it.

2.) What kid of epoxy should I put around the magnet and plates to keep this from happening on the other drivers.

I am going to call Polk CS on Monday to verify without question the availability of the 6511's. Heck, I am going to ask them to have someone go in the parts room and LOOK!


Don

AudioGenics

see http://www.polkaudio.com/forums/showthread.php?t=80334

thread about
JB WELD
and Loctite adhesive

zarrdoss

use any epoxy or jb weld, put thin bead toward the outside, you don't want it squeezing into the VC area then when that dries put a bead on the outside top and bottom as well. did you look for damage and test the VC for resistance?

dcmartinpc

I think the voice coil is OK. It is measuring at 3.2 ohms resistance. What kind of damage should I look for?

Thanks!

Don

zarrdoss

dents in the vc or coming unwound, anything that would make an attempt to re-align it unsuccessful.

michaeljhsda2

zarrdoss wrote: »

the older drivers have cut-outs on the rubber surrounds so the screw does not bind them up. the new ones do not so you have to carefully cut them out or the screw will bind them up and distort the surround or destroy it, here is a pic of the old and new side by side.

As far as Polk CS goes I think calling is always your best bet.

Attachment not found.

I'm glad you brought this up. It appears that the factory is not cutting enough of the rubber away from around the holes. I didn't notice it at the time when I installed a new MW 65xx in my 1C's. A few weeks later i noticed that the rubber was bound up in 2 areas and I thought that the MW was defective. I used a scalpel to cut away the rubber...kinda frustrating that I had to do this. Is there any way to check if the integrity of the surround has been affected?