Newbie here. I have a question about my woofers (not sub).
I have a pair of gorgeous KEF Reference Model Twos in cherry finish that I bought new in 1998, although they had been the floor demos for a few months in a locally owned high end A/V store. They have sounded beautiful with amazing clarity in the mids and highs. The bass can be a little boomy in a HT setup, so I usually let the two subs (both KEFs) handle that.
Just recently, however, I noticed that the woofers (there are twin 6.5 inch back-to-back woofers in each speaker) in my right speaker are not playing anything at all. I have had the speakers bi-wired for years (I know, I know, that doesn't do anything helpful, but tell that to the dummy salesman who suggested I do that). They worked fine. About a month ago, I switched from bi-wiring to bi-amping, although it was passive bi-amping through a second amp (again, I know about the controversy about passive or "poor man's" bi-amping, but I'm not interested in a discussion about that at the moment). Again, I didn't notice anything wrong. It wasn't until I was recalibrating everything in my HT a week ago with Digital Video Essentials that I noticed during the frequency sweep that the woofers on that particular speaker weren't working. They were working fine on the left speaker.
I switched channels, I switched cables, I even made up some new cables and tested them on other speakers before running them to the woofer terminals (yes, the Ref Twos are designed for bi-wiring/bi-amping and I have removed the jumpers). I have tried a different amp and tried the right channel on the left speaker to make sure it's not the channel. It's not. The tweeter and mid drivers on the right speaker work great. Even on stereo music with no processing through the amp I get great bass from the woofers on the left speaker, but none at all from the right.
Here's my question. Could I have a blown woofer? I suspect it is actually an electrical rather than a mechanical problem, especially since there are two woofers in that cabinet, and because I'm getting no sound, rather than weird or crappy sound from the bass. I suspect there is a bad connection on the crossover circuit or to the bass terminals. I'm not so much of an electrical wiz to know what it might be, but I can solder and change out capacitors and resistors (I rewired a guitar from scratch, and made a bunch of upgrades on a guitar amp, for example).
Until my recent upgrade last month to a Marantz SR7001 receiver (110W x 7.1 channels), I was driving the speakers with what is now a 10-year-old Yamaha RX2092 receiver (100W x 5.1), but it was almost new when I got my speakers. I usually run movies at -30 to -15 volume, and music at or below -30 to -20.
Any thoughts or ideas? If it is an electrical problem, is this something I should attempt to do myself, or should I consider finding a good speaker tech and paying big bucks for the repair?
Here's a link to the specs for the 1990s KEF Reference Twos I have:http://www.kef.com/history/1990_2/reference/reftwo2.asp
Design 3 - way, 4 - driver
HF Drive Unit 25 mm (1") ferrofluid – cooled soft dome tweeter
MF Drive Unit 160 mm (6.5") polypropylene cone
LMF Unit(s) No
LF Unit (s) 2 x 160 mm (6. 5") pulp cone
Crossover Frequencies 2.4 kHz, 160 Hz
Frequency Range +/* 3dB 45 Hz-20 kHz
LF Corner -6 dB 39 Hz
Characteristic Sensitivity Level 90dB
Maximum Output 113dB
Amplifier requirements 50-200 W
Impedance 4 ohms
Enclosure type twin interport twin coupled cavity
Internal volume MF : 2.5 litres
LF : 40 litres
Weight 29.6 kg (65 lbs)
Dimensions (H x W x D)
(maximum including grille and feet ) 1012 x 238 x 359 mm
39.8 x 9.4 x 14.1 in.
Standard finish collection
Here's a pic (not my pic, but these look just like mine):
Thanks in advance for any help or suggestions.