Trading L 820 JBL for Polk Monitor 11 ..

VSAT88

Ok folks I really do not get this one. A friend has two Monitor 11s (marked on the back) and I intend to trade him two JBL L820s for them. I really do not care if its all that great of a deal for me as I am bitten by the Polkbug. What I am trying to find out is this. I have seen two completely different images on line of Monitor 11 both say they are Monitor 11 however both are completely different. The set I intend to get have SL 2000 tweeters and a concave or angled (as seen in the images below) passive and two mid woofers. The other monitor 11s I saw on line have a flat passive and peerless tweeters...Really big differences. So , whats up here I know you all can explain this to me. Thank you.

pitdogg2

Your just seeing first gen and second generation of speakers. 1st gen would be flat and sl1000 tweeter and 2nd would be with sl2000 ttweeter and different cone passive

motorhead43026

Both generations of M11's are referenced here. Those are hard to come by.

VSAT88

Awesome, So now. being they are hard to find models should I leave the SL-2000 tweeters alone or are these better upgraded to the Peerless (as I do have two of those) or should I-RDO 194, RDO-198 TL MOD (That is if you can TL MOD them). And I know for a fact I should go with a crossover upgrade as I am keeping these.

pitdogg2

your only real option is the better RDO-194 and yes recap the XO will not hurt one bit.

you do not want to go backwards the 1st gen used different drivers that what yours now have. They XO was not set up to use the Peerless to use one it would shift xo point from what you now have.

VSAT88

pitdogg2 wrote: »

your only real option is the better RDO-194 and yes recap the XO will not hurt one bit.

you do not want to go backwards the 1st gen used different drivers that what yours now have. They XO was not set up to use the Peerless to use one it would shift xo point from what you now have.

Thanks Pitdogg2, I see what you mean. RDO-194 is a fine speaker from what I have heard around here.

Nightfall

Off topic a bit: It looks like you have a lot of extension cords plugged into other extension cords. Be careful, that's a recipe for a fire.

boston1450

Those look very nice. I would listen & see if you like the 2000's & if not change them out to 194's. I have the 11's with the peerless & different passive & really like them. Enjoy

boston1450

One more thing im not sure on that model is - mine are directional L&R speaker. Those maybe too ????
.
EDIT PIC. May have sticker/stamped on back. My drivers are also stamped on stickers with LL & RR per speaker cabinet

pitdogg2

I was under the impression all M11's were that way. Randy does that slo-blo work well for you? I know my cerwin vegas used them but all my Polks all called for fast blow and sometimes they were not fast enough:)

boston1450

Those were changed out. Both those pictures were taking on my porch the day i got them. I replaced them with fb as advised by someone here. Good eye

VSAT88

Nightfall wrote: »

Off topic a bit: It looks like you have a lot of extension cords plugged into other extension cords. Be careful, that's a recipe for a fire.

LOL, thanks..I will tell my friend you said so..He sent me that image from his house..I thought the same..What the hell is he doing with so many extension cords ???

VSAT88

It looks like I was given some bad information from the friend that had these speakers. There were no markings whatsoever on the back of either one of these speakers...The risers at the bottom had to come from the factory. They are an identical match to the speaker above. This is what I have found and some images as well:

Drivers:
1 - 1" SL2000 tweeter,
2 - 6.5" 6510
1-10" Fluid-coupled Passive Radiator.

After a look inside I see a date of April
10, 1987 on the back of the SW 100
Passive Radiator. The crossover is
marked with the date April 6, 1987.

The crossover consist of :
1 34uF 50V Electrolytic Non Polarized Cap.
1 12uF 50V Electrolytic Non Polarized Cap.
1 Polyswitch
2 Inductors. One large and one small.
2 Resistors One is a 2.7 Ohm the other
is a 2.0 Ohm.
This leads me to think that the crossover and all the parts with the exception of the SL 2000 tweeters are exactly the same as the Monitor 10 as I looked at several crossover schematics . I guess I am still wondering what these speakers are? Are they really Polk Monitor 11s or are the some kind of cross breeds made one drunken, high (or both ) Friday night after work in April 1987 ??




[IMG]http://i292.photobucket.com/albums/mm23/jimspamfolder /IMG_20150929_170528197_zpsfgzohqlc.jpg[/IMG]

[IMG]http://i292.photobucket.com/albums/mm23/jimspamfolder /IMG_20150929_170542233_zpspexlusga.jpg[/IMG]

boston1450

My 11's are stored in boxes-cause i rotate speakers. Let me find my thread where i spiked them. I think i measured them with the base & with the spikes on it. I will report back... I know my woofers are not those. I wanna say 6511's & they were directional woofers with tags that say left or right after the MW####. I have my book out in garage & can look. I think the base was 2 1/2 inches
..edit.. Dont quote me on this^^^^^ im exhausted

boston1450

boston1450

Compare. Hope this is helpful http://www.polksda.com/monitor11.shtml

Nightfall

19Hz? Surely that is a typo?

Edit: I take that back. I was thinking of -3db Apologies.

VSAT88

Ok, that's good to know for sure ! Now I can move forward a bit farther . I wanted to know what kind of horse I was about to ride...A Bronco or an Old Mare...Thanks to you all for your help !

VSAT88

Ok, I have a few more questions to anyone who can help. The Series one Monitor 11s show a left and right speaker placement. So my question is this. Do the Series two have a right and left speaker placement as well and if so how would I tell what goes where as I do not have any stickers of any kind on the back of my speakers.
Second question. I have read that the insulation material ( stuffing, dampening, white stuff inside the speaker) should be moved up and away from the back of the passive radiator in the Monitor 5 and 7 for better bass. Is this true with all the Polk speakers including the Monitor 11s ? I know that on my SDA II b speakers have none behind the radiator, only behind the drivers.. Thanks again.

boston1450 wrote: »

One more thing im not sure on that model is - mine are directional L&R speaker. Those maybe too ????
.
EDIT PIC. May have sticker/stamped on back. My drivers are also stamped on stickers with LL & RR per speaker cabinet

boston1450

I may be wrong here & please correct me if i am.... You may have the earlier version & it may not be directional (kinda like the Monitor 10's but built with stock base) where both of your woofers are the same.... Like i stated above. My version=The Left speaker of mine has 2 MWxxxx left on each woofer tag & so forth on the right woofer. Maybe someone with more knowledge will chime in.... but if all your woofers are the same. I think they may not directional BUT could be by crossover design. Thats has me wondering ? Are both crossovers the same ?

boston1450

Oh. If ya got those apart why not Loctite the woofer magnets to prevent them from shifting. 3.00 tube will do the job

VSAT88

boston1450 wrote: »

Oh. If ya got those apart why not Locktite the woofer magnets to prevent them from shifting. 3.00 tube will do the job

Oh yes. I am going to do these woofers. You recommend Locktite brand or epoxy period no matter what brand ? I did my SDAs with whatever brand the craft store had. I do not recall the brand...

VSAT88

boston1450 wrote: »

I may be wrong here & please correct me if i am.... You may have the earlier version & it may not be directional (kinda like the Monitor 10's but built with stock base) where both of your woofers are the same.... Like i stated above. My version=The Left speaker of mine has 2 MWxxxx left on each woofer tag & so forth on the right woofer. Maybe someone with more knowledge will chime in.... but if all your woofers are the same. I think they may not directional BUT could be by crossover design. Thats has me wondering ? Are both crossovers the same ?

Yes both woofers are the same number (MW 6510) the crossover values are in the post above, a 34uF and a 12uF and I am pretty sure these are the woofer bypass caps as they are the two bipolar electrolytics....So I guess when I am done with the epoxy / glue and the rest I will hook them up and try and see what woofer plays full range and what one does bass only and mark them correctly...Hell, I am still confused...

VSAT88

Quick update the woofers are wired in parallel from the crossover. In other words from the crossover network there are only two wires going to the Mid woofers then two wires jump from one Mid Woofer directly over to the other Mid Woofer therefore the signal is the same to both..Meaning no L. or R. Speaker placement.. This is for Series 1 Monitor 11..Thanks

VSAT88

While I had the cabs. open decided to"mortite" dampen the cast metal on the back of the speakers and passive as well as epoxy for all the drivers. I removed the poly switch from the crossover and moved the speaker stuffing / cabinet dampening material away from the back of the passive and put it up in the cabinet towards the mid drivers but not covering the backs of them up. I did no capacitor, resistor, or inductor changes. I put it all back together, checked for air leaks and a nice surprise I had. I used my Dynaco ST 70, my JVC QL-Y5F turntable and computer thru my Modi DAC to a SPEC1 Pioneer preamp. Blood Sweat and Tears...Man these speakers sound great. I think I may have to keep them. Thank you all for your help !

George Grand

19 cps for a -3db point? I don't think so. With no -db indicator present, I figure that's a -6 or -12db figure. The RTA11t was rated down to 22 or something like that. Never happen.

All that aside you're getting the better part of the deal. Are those the "HLS" horn-loaded JBL's from the mid 90's? I think the bottom of the line was the HLS 810, a six" ported two-way bookshelf. The 820 was next up in the line. You done good.

VSAT88

Thanks I thi

George Grand wrote: »

19 cps for a -3db point? I don't think so. With no -db indicator present, I figure that's a -6 or -12db figure. The RTA11t was rated down to 22 or something like that. Never happen.

All that aside you're getting the better part of the deal. Are those the "HLS" horn-loaded JBL's from the mid 90's? I think the bottom of the line was the HLS 810, a six" ported two-way bookshelf. The 820 was next up in the line. You done good.

Thanks, I think so too. I know they sound great.