Those L710-A (not sure if the -A stood for aDs or Aria) are first generation aDs made with imported brAun drivers probably manufactured in 1974. The cabinets were made in the US. Aria was the name of the corporation that imported Braun gear.
Edit:
@ArtMann Those 710A are sweet speakers and I would guess they are more desirable than the aDs versions made a year later with the first aDs made drivers. Braun woofers utilized butyl rubber surrounds (early aDs first used foam before switching to rubber) and the Braun mid range has a larger magnet. The cabinets look well made to me. The cloth grills common to early aDs speakers have protected the sticky domes all these years. They used Braun crossovers I assume and you might want to consider replacing the woofer lytic capacitors at some point (guessing you have to access by removing a woofer). Those are keepers.
See post #4 by
@Dswankey in this thread for a little history of the company and its founder.
Additional details below via a couple of fun quotes stolen from the interwebs:
Soundmotor posting on ecoustics forum:
aDs was formed by Dr. Godehard Guenther in the early 1970s and after he started the Braun-Aria company. Braun-Aria and was an importer of Braun loudspeakers. This led to building cabinets in the USA with Braun drivers. This was the first iteration of aDs (mirroring the brAun logo at the time.) Eventually, a factory was opened in MA and the drivers were built there. This takes the company up to ~1981. In 1981, ADS (new logo) was approached by Gillette which had bought Braun. Gillette sold the Braun hi-fi division to ADS. By 1981 ADS was quite successful and Dr. Guenther’s earlier relationship with Braun opened the door. Although there was collaboration between the 2 companies, each had unique speaker lines which were not shared. Braun continued producing its own drivers as did ADS. Electronics however were, the Atelier line specifically.In 1990, a/d/s/ (logo change in 1988 or thereabouts) sold Braun back to Gillette. In 1992, a/d/s/ was purchase by the Museatex group out of Canada. In the late 90s, the last office for a/d/s/ closed in MA and the company relocated to AZ.
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Leif posting on rec.audio.groups:
Kind of a cool story here. The founder, Godehard Gunther, was a NASA guy and subordinate of Werner Von Braun. If there was a relationship between Von Braun and Braun hifi, I am not aware of it but who knows? ADS was however dependent on Braun hifi only for material to resell. They were not owned by them or even German. ADS was a US company from the beginning. The founder however was indeed German.
GG began importing Braun in the late 1960's into the US under the Braun Aria name. Some of the first items were the LV1020 active/triamplified studio monitor (All active in 1970!) and the TG1000 reel to reel deck. He also brought in many of the passive loudspeakers. Importing wooden boxes was prohibitively expensive though.
GG left NASA and opened ADS Aria in Huntsville, AL ~1972 and then moved to MA the next year. In ~1974, manufacturing began with US sourced cabinets using Braun drivers and crossovers. Starting in 1975, the first manufacture of US made copies of the Braun drivers began. In 1981, Gillette approached GG and sold the hifi division of Braun to ADS. This relationship lasted until 1990 when the hifi division was sold back to Gillette. It was never profitable but the marriage brought some interesting products into the US.
The usage of notable industrial designers should also be mentioned. Braun used Dieter Rams for their hifi products until the early 1980's and then Peter Hartwein picked up the ball. ADS used Hartmut Esslinger of FROG Design in Berkeley, CA. Esslinger did the first Macintosh. Rams & Hartwein did so many classic Braun consumer products that you would have to be the Unabomber not to recognize them.
Another side note are where some of the people at a/d/s/ went. Michael Kelly (Pres., Aerial Acoustics), Chris Browder (Pres. B&W USA) are alum's as well as a list of others too lengthy to go into here.
The 710's were quite interesting. The tweeter/midrange layout was such so that when the product was placed on a bookshelf on their side, the HF alignment was vertical. They actually image quite nice when used that way. The foam surrounds were because the woofer frame used for the 7" in the 710 was an odd size in the speaker industry. Only one supplier produced the cone and surround. It was not until that supplier switched to butyl rubber that a change could be made. The foam surrounds were used on the series one (cloth grille) and some early series 2 (metal grilles).
I appreciate the extra info!
