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In Reply to: RE: tannoy cabinets question posted by blinx7 on February 16, 2015 at 10:43:44
Those sims presuppose that your speakers' measured response is close to the original published ones, which is highly unlikely. After all this time, it would be surprising if your Golds even measured the same with respect to each other.
Under certain circumstances, it may actually be advantageous to tune each cabinet to a slightly different frequency, on the theory that by spreading out the resonance, the speakers will be less likely to excite room modes, resulting a smoother response.
You can also try closing up both ports to create sealed systems, or what in those benighted times we referred to as infinite baffles. In the Olden Days, many Tannoy enthusiasts, especially those with a preference for symphony and opera, preferred sealed cabinets. Closing the ports will raise the system resonance, but the rolloff will be more gradual, and the bass will be tighter, and possibly more natural. All it would take to try it is two pieces of scrap lumber.
Follow Ups:
If all else fails, I might just end up, as you propose, sealing up the ports to see whether that seems like an appropriate thing."Closing the ports will raise the system resonance, but the rolloff will be more gradual, and the bass will be tighter, and possibly more natural."
What's the downside of 'raising the system resonance' ? Gradual rolloff, tighter bass, that all sounds like advantage. Will the bass be diminished, but what remains is tighter ?
Like everything in audio I'm guessing there's a tradeoff, but not sure I'm getting the basic deal here..
thanks
Edits: 02/17/15
Low tech, perhaps, but undeniably scientific: Place your speakers next to each other. Pick out several of your favorite recordings. Set your preamp's selector switch to mono.Enlist a friend to turn the balance control back and forth, from the right to the left, then back again until you have decided which port size sounds best.
Next, seal up the port of the less-liked speaker, and repeat the process until you have determined your preference, ended the friendship, or both. Welcome to the Asylum.
Edits: 02/17/15
good post; and yes a good way to get rid of friends / wives whoever...
Undeniably scientific? Well, certainly some kind of scientific.
The problem arises where neither of the port sizes I have are anywhere near correct. At that point all the a/b comparisons in the world won't really add up.
Hopefully though, T&S-based "you need x-dimension ports" info would settle it with more authority.
Experts ?
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