Kenwood LS-408-B

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General information[contribute]

The Kenwood LS-408-B is a dynamic speaker. It was manufactured from 1980 to unknown.

Justin Cox (June 24, 2019): Actually they were made from 78-79. And the woofers are 12-inch in the 408. The 405 and 407 used 10-inch woofers. The proper designation is "LS-408B" (no dash between 8 and B). The 408B was also unique in the LS-40xB lineup in that they used real walnut veneer for the outer cabinet (the face was birch veneer) rather than simulated woodgrain vinyl.

Alternate names[contribute]

Charles Costanzo (September 29, 2007):Kenwood LS-408B

Refurbishing[contribute]

Justin Cox (June 24, 2019): The drivers were suspended with the foam ring affixed to the REAR of the woofer cone. Most other speakers were suspended on the face of the cone. The speaker will perform well either way, but for a truly authentic look when refoaming, attach the foam behind the woofer cone.

Modifications[contribute]

Justin Cox (June 24, 2019): The LS-407B and 408B used capacitors to limit frequency response, rather than a true crossover. Additionally, the woofers were full frequency (not limited) and could get muddy. Lastly, the midranges were wired out of phase (I dont know why). But these can be improved by installing a true 3-way crossover at 2500hz and 5000hz, and flipping the midrange back into phase (reverse the positive and negative leads); this sharpens the response and tightens the bass, making an already excellent speaker sound even better!

Reviews[contribute]

Charles Costanzo (September 25, 2007):Excellent! 5 stars for a fully working operational original set of these walnut veneered cabinet speakers.

CMC (January 29, 2009): I should also say that the performance of these Kenwoods is absolutely brilliant, detailed and so precise, I could listen to them for hours and hours and not suffer any listening fatigue. They are so detailed, in fact, that my pet cat loves to listen to them when I play some vintage real Jazz, Bob James or Maynard Ferguson. NO over-bright shrill, coloration or overtones from the tweeter or midrange at any volume level. they are 92dB sensitivity which makes them very efficient for the 1970's. The bass response is so fluid, tight and quick that you don't even see the woofer moving during a "punch" with only 1 watt of power. On a EEG meter the bass damping from the port showed only one cycle overshoot, or "heartbeat" indicating a superb damping factor with no "huffing" heard from the port during playback. They have the rare ability to "hit" you with that hard bass punch much like a sealed "suspension" enclosure, and they just give you more and more and more! They have the flattest response curve of any ported speaker you will ever hear! I have listened to many many speakers over the years and I always go right back to my LS-408B's.

Ed Nunez (October 18, 2009): I bought my set of LS-408B,s in 1978 for my 21st. birthday and I must say it was a very good investment. I have replaced the 12" woofers with 290 watt units, after 30 years something had to BLOW!!. Im running Phase Linear equipment with a 400 series II amp. and the LS-408B cabinets are holding as strong as the day I got them. The sound is awsome and my nieghbors just love them. I've nicknamed my LS-408B's "the Evictors" I'm not going anywhere, it's my house.

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