JBL L220 Passive Radiator Weights
These are the correct weights for the JBL L220 passive radiator. Each weight is 100 grams. The L220 has two weights per passive radiator equaling 200 grams. To convert a JBL L222 Disco to an L220 Oracle you will need to add 200 grams of weight to each
Continue Reading...Audiophile 101, Part 4: The 38% Rule
In Part 2 of the Audiophile 101 series we discussed rooms and speaker positioning. We will now discuss the listening position and the importance of the 38% Rule. In many online audiophile forums and articles you will run across people discussing the “rule of thirds” in relation to speaker positioning. While this may offer some benefits under certain conditions, it isn’t really a rule at all. The most likely source … Continue Reading…
Altec Lansing Based Compostela Loudspeaker Review
The Compostela Loudspeaker System “Compostela”, literally “a field of stars” is the result of over two years of design and engineering. Everything from its stacked box design to the drivers chosen reaches back to the golden age of Altec Lansing. Design: The Compostela loudspeaker system is a D’Appolito hybrid design also known as an MTM. You can learn more about MTM designs here. Components: 2 x Altec Lansing or Great … Continue Reading…
North Georgia Audio Society Meeting: Spring 2019
As many of you know our regularly scheduled Fall 2018 meeting had to be delayed due to the many running changes in the Compostela enclosure design, which resulted in them not being completed in time. This, in turn, led to scheduling problems for many of the members who live far from Atlanta. After one aborted attempt we were all finally available to meet on Saturday, April 13, 2019. We know … Continue Reading…
North Georgia Audio Society Meeting: Fall 2017
The North Georgia Audio Society’s Fall 2017 meeting was an opportunity to test out some really great equipment. The guys from Pax Innovation worked until midnight to have everything ready for us, and as always the restoration work was top notch. The components to be tested were a pair of Mark Levinson ML-2 amplifiers, Yeatts custom tube amplifiers, restored Crown D-45 amplifiers, Altec Lansing 311-60 horns w/ 299-81 drivers, restored … Continue Reading…
The Altec-Lansing Model 19-MR3: The Loudspeaker That Never Was
The Altec-Lansing M500 Maestro is a largely lost and forgotten loudspeaker, but it is, perhaps, the best the company ever built. It arrived in the final days of Altec-Lansing, Inc., and production was cut short due to the sale of the company. Why is the M500 Maestro important to us today? It provides the framework for what would have been the replacement for the highly acclaimed Model 19. It has … Continue Reading…
Altec-Lansing Valencia: Improving a Classic
The Altec-Lansing Valencia 846B is an American audio classic that inspired the development of the legendary Model 19. It shares many similarities with the newer and larger Model 19. There were two versions of the Valencia: the 846A and 846B. For our testing purposes we chose the 846B due to its impedance, and that it was a tuned port enclosure. We had two goals with our Valencias: 1. Make them … Continue Reading…
Dynaco ST-70: A Timeless Classic
David Hafler and Ed Laurent founded the Dyna Company (later Dynaco) with the intention of not only producing transformers, but high-quality audio circuitry. The company was incorporated in October 1955, with business premises located at 617 N. 41st St in Philadelphia. Dynaco’s first product was the Mk. II 50-watt power amplifier. Available as a kit or preassembled unit, the Mk. II was sold for several years until its replacement in … Continue Reading…
Altec Lansing Model 14, Part 4: The Ultimate 14 (Updated!)
If you’ve been following our Altec-Lansing Model 14 project that began with a summary of the loudspeaker, this final part will be of special interest to you. After spending 8 weeks testing the Model 14 with various crossover configurations and amplifiers, we’re ready to report our findings. The Altec Model 14 suffers from a couple of weaknesses that have led to its lack of popularity among audiophiles. Firstly, Altec-Lansing revised … Continue Reading…
Saying Goodbye to an American Icon: JBL
It appears that this is the end for JBL as we have known it. – Greg Timbers James B. Lansing founded JBL one year after leaving Altec Lansing as their Vice President of Engineering in 1945. The company was first called Lansing Sound, Inc., from 1 October 1946, and later changed its name to James B. Lansing Sound. James Lansing was noted as an innovative engineer, but a poor businessman. … Continue Reading…