View Full Version : ads L780's


mhardy6647
01-30-2006, 12:02 PM
OK, don't start with me! :-) I have a "how much are they worth?" question.

Someone at work is selling a pair of ads L780 speakers in "good condition" for $85. I've always liked the ads/Braun sound, but never owned a pair, and I am not expert on the line. If they are indeed in good shape, are they 85 smackers' worth?

Thanks!

Wornears
01-30-2006, 12:10 PM
Absolutely! Buy them. That is an excellent price; no shipping either. Great sound.

From Orion:

A/D/S L-780 Black or Walnut

3-way, 8.25-in woofer
2-inch mid
3/4-inch tweeter
Years made: '84--/87
MSRP = $700/pair

cableguy
01-30-2006, 12:15 PM
I know I would buy them at that price, and I've seen them selling for a heck of a lot more. Paid $50 for a set of L 620's

mhardy6647
01-30-2006, 12:41 PM
Thanks, I am calling the guy now.

dingus
01-30-2006, 12:53 PM
hope you got em, thats a sweet deal.

Kegger
01-30-2006, 01:50 PM
Run!

mhardy6647
01-30-2006, 02:22 PM
Anyone got a handy photo of this model?
Are the woofer surrounds foam or rubber?

Sorry... so many questions...

soundmotor
01-30-2006, 02:30 PM
Anyone got a handy photo of this model?
Are the woofer surrounds foam or rubber?

Sorry... so many questions...

http://oaktreeent.com/web_photos/Stereo_Speakers/ADS_L880-2_Speakers_web.jpg

An L780 is ~3/4 of the above L880.

The L780 woofer has a pincushion style flange.

mhardy6647
03-08-2006, 12:34 PM
I did pick these up. Cosmetically very good, although the grille of one is quite dented.
They sound pretty good, but to tell you the truth, not as good as I remembered. I think I am getting jaded. I like the Allison Ones better.

kfa888
03-08-2006, 02:57 PM
I did pick these up. Cosmetically very good, although the grille of one is quite dented.
They sound pretty good, but to tell you the truth, not as good as I remembered. I think I am getting jaded. I like the Allison Ones better.

Feel free to ship those crappy speakers to me :D

dingus
03-08-2006, 04:21 PM
They sound pretty good, but to tell you the truth, not as good as I remembered. I think I am getting jaded. I like the Allison Ones better.
i think thats a natural reaction to the Allison I. i used to have a pair of ADS L-730's and they were outstanding. i would expect the same from the 780, but neither is in the same class as the Allison I.

dingus
03-08-2006, 04:22 PM
Feel free to ship those crappy speakers to me :D
Kelly, if you are really hard up, there are a pair of L-810's up here on craigs for $500.

kfa888
03-08-2006, 04:25 PM
Kelly, if you are really hard up, there are a pair of L-810's up here on craigs for $500.

Thanks but I need a bargain, if I was to spend $500 it would be on some more maggies, subs or amps.

bordeno
03-08-2006, 06:52 PM
Allison Ones, not a fair fight. Very high end prestige speakers.

Not to take anything away from the 780s. You're lucky to have both. By the way how efficient are those Allisons? What are you driving them with?

mhardy6647
03-08-2006, 08:20 PM
Tried them with the same CR-2020 that I use with the Allisons. The ads's seem moderately efficient (mid/upper 80's? I am guessing). They just seemed a little -- distant.

LBPete
03-09-2006, 12:18 AM
Isn't there an L780s and a L780II. I have a pair of the L780II. I think the main difference is the woofers. The woofers in the IIs are not a good as the ones used in the earlier L780. Still damn good speakers. The cabinets on my look like teak and they are beautiful.

- Pete

wineslob
03-09-2006, 09:58 AM
I did pick these up. Cosmetically very good, although the grille of one is quite dented.
They sound pretty good, but to tell you the truth, not as good as I remembered. I think I am getting jaded. I like the Allison Ones better.
Thats a hellava speaker you are compareing them to!

mhardy6647
03-09-2006, 11:03 AM
These are unsuffixed. I'll pull them out this weekend, snap a photo or two, and give another listen. Might try 'em on the Fisher 500C.

soundmotor
03-09-2006, 11:34 AM
The woofers in the IIs are not a good as the ones used in the earlier L780.

How did you arrive at that conclusion?

LBPete
03-09-2006, 08:52 PM
Iím basing it on some research I did a few years ago. I bough my L-780s on ebay. The glue that was supposed to hold the butyl surrounds down to the basket, had corroded the lip of the steel baskets to the point the surrounds separated from the baskets. (Almost all the L-780IIs or L-590IIs I see on Ebay have some degree of the corrosion.)

Looking for information, I found that the woofers on the series I were 206-0324 and the series II have 206-0355. I havenít seen the 0324s myself but I was under the impression they have cast baskets while the 0355s have stamped steel baskets. I also donít think the 0324 are likely to get the glue corrosion that are the curse of the 0355s. As far as the sound quality goes, I havenít heard the series I but I like my series IIs but they donít sound as good as my L880s.

- Pete

soundmotor
03-10-2006, 07:06 AM
Iím basing it on some research I did a few years ago. I bough my L-780s on ebay. The glue that was supposed to hold the butyl surrounds down to the basket, had corroded the lip of the steel baskets to the point the surrounds separated from the baskets. (Almost all the L-780IIs or L-590IIs I see on Ebay have some degree of the corrosion.)

Looking for information, I found that the woofers on the series I were 206-0324 and the series II have 206-0355. I havenít seen the 0324s myself but I was under the impression they have cast baskets while the 0355s have stamped steel baskets. I also donít think the 0324 are likely to get the glue corrosion that are the curse of the 0355s. As far as the sound quality goes, I havenít heard the series I but I like my series IIs but they donít sound as good as my L880s.

- Pete

The corrosion issue is odd and I don't have a conclusive answer as to why nearly all of the later ones can have it to some degree. When I say later, it is nearly all pincushion style steel basket speakers, not just the ones in the 780. The last generation round steel baskets don't seem to do this. I've seen it on early vintage ones too, but not with any prevalence. I suspect that the glue formulation was changed somewhere along the way. I've never seen the surrounds lifting on the cast basket models although, glue can certainly break down and be improperly applied.

All 780's used stamped steel baskets. The early versions did not use cast. When you moved up in the line to the 880 series & towers, you got cast ones. I don't believe that 206-0324 is the correct part number. Pretty sure that number was for the 10" used in the PB1500 subwoofer cabinet. 206-0354 rings a bell but that is a shot in the dark.

The major changes across the board from Series I to Series II was the protection scheme in the crossover, from fuses to polyswitches. Sometimes some minor tweaking in the crossover values too. When ADS changed the part number of a woofer that was virtually identical to its predecessor, it usually signified a cosmetic or production process change to a functionally identical part. Easiest to see that on was the tweeters & mids. Sometimes there were drive system improvements such as changing the voice-coil former to Kapton from aluminum. That gave them better durability in an abuse or overdrive situation.

Lastly, polyswitches are a mixed bag. Many hate what they do to the "sound". You can make the argument that anything will sound better with fewer parts in series with the drive units. Perhaps some of your concerns on sound quality relate to that?

LBPete
03-10-2006, 08:23 PM
I'm not familure with "polyswitches." Are they some kind of resetable fuse? If they affect the sound quality can they be removed and replaced with fuses?

- Pete

mhardy6647
03-10-2006, 08:56 PM
Yeah the Raychem "polyswitch" is some sort of self-resetting fuse gizmo. PartsExpress, Mouser, Digikey sell 'em (or at least they did). They were considered to be just short of the Antichrist when Klipsch started using them in their Heritage speaker crossovers (IIRC).

soundmotor
03-11-2006, 07:34 AM
Yeah the Raychem "polyswitch" is some sort of self-resetting fuse gizmo. PartsExpress, Mouser, Digikey sell 'em (or at least they did). They were considered to be just short of the Antichrist when Klipsch started using them in their Heritage speaker crossovers (IIRC).

The way they work is pretty neat. When the current going through them is low, they have milliohm resistance. When the current goes up, they heat up and the resistance goes into the megohm range essentially shutting off the the driver they are attached to. These are called positive temp coefficient (PTC) polyswitches. To reset them, you turn down the volume and in 30 seconds or so, they reset. If you shut off the system it takes half an hour or more to get them to. "Solid-State Tweeter Protection"; you know what you are dealing with. If you bypass them, in general you need to add series resistance to offset them. 0.3 ohms is the approximation.

Inrush current limiters (like you'll find on an SS receiver) work exactly the opposite and are called negative temp coefficient (NTC). When they get hot their resistance goes down. Polyswitches are essentially a solid-state device.

LBPete
03-11-2006, 11:30 AM
Now I see what the fuss is about. I suppose they could fail in a way that would add some unknown amount of resistance in the circuit. That would affect the sound quality.

- Pete