Tired of clutter, made my pair of dual concentric series 600 tannoys and a nearly matching d6c into a three channel sound bar; along with a isobaric 10" pair of subdrivers , forms a good tv stand, saves a lot of space.
It sounds more natural than too wide too high mounting, and allows for very solid sealed cabinetry.
Couldn't part with old tannoys, they are excellent cinema speakers.
Be careful of the distinction between UL listed and UL standards. We just received a lessons learned memo from the gov talking about this distinction. Apparently passing UL standards is not the same as UL listed. We are required to use listed equipment, and somebody was gigged for selling equip which didn't have that tag on it, yet the product sheet stated "to UL standards".
I was referring to NEC 2008
(I have bolded what I believe to be the relevant part.)
250.4 General requirements for grounding and bonding.
250.4 (A)(3) Bonding of electrical equipment.
Normally non current-carrying conductive materials enclosing electrical conductors or equipment, or forming part of such equipment, shall be connected together and to the electrical supply source in a manner that establishes an effective ground-fault current path.
250.4(A)(5)Effective ground fault current path.
Electrical equipment and wiring and other electrically conductive material likely to become energized shall be installed in a manner that creates a low-impedance circuit facilitating the operation of the overcurrent device or ground detector for high impedance grounded systems. It shall be capable of safely carrying the maximum ground-fault current likely to be imposed on it from any point on the wiring system where a ground fault may occur to the electrical supply source. The earth shall not be considered as an effective ground-fault current path.
jn
I didn't even know the distinction existed..
Here's the scoop sent to us.
Discussion of Activities:
In October 2013, Savannah River Site (SRS) ordered a part off a manufacturer’s cut sheet which
referenced a UL Standard. The particular application required the part to be UL Listed and the
reference to the UL Standard was thought to mean that the part was UL Listed.
Analysis:
When the part was received, there was no UL stamp or UL marking of any kind. The manufacturer was
contacted and responded that, just because a UL Standard was referenced on the cut sheet, it did not
mean the part was UL Listed.
It meant that the part was manufactured to the requirements of the UL Standard but it was not
independently certified by UL. According to the manufacturer, if the part had been certified by UL, the
catalog would have explicitly stated that the part was UL Listed and it would have been appropriately
marked.
In discussions with UL tech support, they confirmed this practice. They said that many manufacturers
purchase UL Standards and produce parts built to the standard; however, they do not pay UL to
independently certify the part (which is what would have been required for the part to become "UL
Listed").
Recommended Actions:
When purchasing parts that are required/desired to be UL Listed, we need to ensure the catalog or
other vendor documentation explicitly states that the part is UL Listed.
If there is any doubt or the documentation is unclear as to the UL pedigree, contact the manufacturer
and confirm the part is UL Listed prior to ordering.
jn
The difference is when you get hauled into court with a product at fault, you can say either (1) the safety agency certified that we meet the requirements, or (2) we designed to meet the sSafety Agency specifications.
(1) is a more defensable position.
(1) is a more defensable position.
The key is if you are making an amp, you dont need to throw in a can of baked beans just in case the akakp needs one.
I try to design all my amps to meet the appropriate safety specs even though I don't sell them. I value my children who I give the amps to.
That said, I have not replaced my stock of MOVs with UL 1449 (Sept 2009)approved devices.
That said, I have not replaced my stock of MOVs with UL 1449 (Sept 2009)approved devices.
for example sat tv signal (xy ghz) is polarized-its spin. to save the bandwith. why it does not exist on lower frequencies?🙂
not sure why to do rocket science on speaker cables.
super high frequencies -the amps will not amplify it, tweeters will not play it, average age ears will not catch it
If our society gets any *safer* we will wind up brokering all the extra years of life we are cheating death out of back in some form or other. We should always remember that safe has a cost. Really this is already occuring, we just dont speak of it.
I found a leaked video of the Bybee Company discussing their current products.
Blazing Saddles 1974 Campfire Scene - YouTube
😱
Pete- big speakers? Is this to mean big drivers too?
I'm guessing the reasoning is a larger radiating surface produces more volume with lower excursion, meaning lower Doppler distortion.
This may be why I always liked my Dads old voice of the theatre speakers from when the Stardust Theatre got torn down.
We never worried about dispersion, beaming, or prat 35 or 40 years ago.
I must admit, the original Voice of the Theatre speaker my father had sounded pretty good, as long as the cat hadn't unplugged the DC power supply for the magnet. Not very deep bass, nor really good top end, but it did fill the room....
The later Magneplanars were better, though....
The later Magneplanars were better, though....
Great comment, I'm concerned about the collateral damage issue we cheat the reaper at the expense of less "enlightened" folks.
Of course, that is the big bugbear - that our society is very 'unfair' in the way it operates in so many areas - aspects of "primitive" cultures living in South American jungles are so far ahead of us in this respect ...
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