[Vintage-Audio] AR-4 Puzzle

Thu Jul 3 18:24:00 2003

I never liked running any DC into my speakers to stimulate movement plus,
as you mentioned, there are some enclosures where you either can't pull
the front off to feel the woofer or it's difficult to do.
I should be around Sunday.
Pete

On Thu, 3 Jul 2003 18:00:02 -0400 "Duane Fischer, W8DBF"
<[email protected]> writes:
> Good idea Pete. Thank you.         
>         
> I usually use a 1.5 vdc battery across the terminals to determine 
> phase
> polarity. However this requires one to be able to see, or feel, the 
> cone of the
> speaker. If it moves in, reverse the polarity so that it moves 
> outward. But
> there is no apparent way into these AR-4's! I really do not want to 
> waste some
> of my Black Cat firecrackers on this project!          
>         
> Hope to hear you on the Net Sunday Pete -         
>         
> DBF         
>   
> --------
> From: [email protected]
> To: [email protected]
> Subject: Re: [Vintage-Audio] AR-4 Puzzle
> Date: Thursday, July 03, 2003 5:45 PM
> 
> Actually it doesn't make a difference as long as both speakers 
> internally
> are wired the same to the terminals. Remember you not running DC 
> voltage
> to the speakers. Here's a way to test to see if both terminals of 
> each
> speaker are wired the same internally to the enclosure. Connect the 
> top
> terminal of one speaker to the left channel, positive marked,
> amplifier/receiver speaker terminal; connect the top terminal of 
> the
> other speaker to the right channel, positive marked, 
> amplifier/receiver
> terminal. Connect the unused terminal of each speaker to each other. 
> Run
> some audio through the amplifier/receiver so that's it's audible in 
> the
> speakers. Put the amplifier/receiver in the monaural position and 
> adjust
> the balance control to roughly mid-center. If the speakers are wired 
> the
> same ( top terminal of left is the same as top terminal of right ) 
> then
> you should find a spot, when adjusting the balance control, where 
> the
> audible sound of both speakers is minimal or very low. Mark the top
> terminals with a plus, a red dot, a happy face, etc. If the speaker
> terminals of both speakers are not wired the same, rotating the 
> balance
> control will not provide very low audio. i.e. they will be out of 
> phase.
> Pete
> 
> On Thu, 3 Jul 2003 16:40:56 -0400 "Duane Fischer, W8DBF"
> <[email protected]> writes:
> > 
> >         
> > Hi All,         
> >         
> > I just received a pair of AR-4 speakers. There are no markings of 
> 
> > any kind to
> > indicate the polarity of the speaker terminal screws. Looking at 
> the 
> > rear,
> > standing vertical, tweeter adjustment shaft to the right: what 
> > polarity is the
> > top terminal?         
> >         
> > If anyone has any specifications on these speakers, such 
> > as:        
> >         
> > type of tweeter        
> > size of mid range/woofer (same speaker)         
> > crossover frequency         
> > actual frequency response        
> > minimum continuous RMS required to drive them            
> >         
> > Thanks guys.         
> >         
> > DBF         

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