JBL L300 Modification

In this much sought after modification project, Nelson Pass rekindles his desire for the JBL L300 Summit loudspeakers and completes a renovation. As he explains, “it is not a trivial task to improve on original JBL design." "I think I’ve managed to respect the JBL legacy while tweaking the sound to reflect the tastes of the 21st century.” Article originally published in audioXpress, January 2012.

All-pass filters are perhaps one of the most overlooked and misunderstood tools for the general audio practitioner. Much has been written about their use to yield more linear phase response through the majority of a loudspeaker’s passband. They can also be used to optimize the directivity and magnitude response of a loudspeaker system. Perhaps we should first look at exactly what an all-pass filter is.

AudioControl announced the addition of new volume control functions to its multi-channel network amplifiers, The Director Model D3400 and D4400. Both models now have the ability to increase and decrease volume levels incrementally in each zone, set volume level on a per group basis and set a default “Maximum On Volume” function, expanding the application potential of The Director series considerably.

Audiofly added the AF180 to the Audiofly Performance Series of In-Ear Monitors (IEMs). The AF180 offers four expertly tuned balanced armature drivers, and adds crossover circuitry for a sound experience that, according to the company, “redefines the in-ear monitor market”.

Westone, a manufacturer of high-performance audio and in-ear monitoring technology, has announced its new signature series W50 and W60 model earphones. Combining the latest in design with elite performance drivers and crossovers, the Signature W-Series is intended to continue the …

PreSonus is shipping the ultra-compact Eris E4.5 studio reference monitor, the third model in the Eris series of two-way monitor speakers announced one year ago, at the NAMM 2013. As with the Eris E5 and E8, the E4.5 can be user-adjusted to the acoustic space, allowing to create a more accurate listening environment or to simulate different common listening environments.

Member Name: Dennis L. Green Location: Farmington Hills, MI Education: BSEE Occupation: Retired Member Status: Dennis has been a subscriber since the first issues of Audio Amateur and Speaker Builder. He switched to audioXpress after their demise, mostly for the …