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Speakers just arrived! Question.
#255753 04/06/09 09:55 PM
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davekro Offline OP
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Woo Hoo! My speakers just arrived! No time to look this up. Busy unboxing, wiring the A/B switch for M80s/M60s. \:\) We'll see how the Denon 1909 does with both the 60's and 80's. Let the games begin! \:D

I'd guess spikes for wall to wall carpet (with pad). Buy in all my research, I never looked into (or retained ;o) what and why spikes are used vs. sitting on carpet vs. on rubber feet on carpet.

Photos will follow. Boy is Fed EX rough on the boxes! A couple of punch holes but no damage.

More later...

Last edited by davekro; 04/06/09 09:56 PM.

Dave

"In theory, practice and theory are the same. In practice they're not."
Re: Speakers just arrived! Question.
davekro #255756 04/06/09 10:08 PM
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\:\) Congrats, Dave...a busy evening lies ahead!!


Half of communication is listening. You can't listen with your mouth.
Re: Speakers just arrived! Question.
Adrian #255757 04/06/09 10:16 PM
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davekro Offline OP
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I guess I'll go with the spikes and hear the discussion later. \:\)

Off to hook up speakers fronts first.


Dave

"In theory, practice and theory are the same. In practice they're not."
Re: Speakers just arrived! Question.
Adrian #255758 04/06/09 10:18 PM
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The spikes allow the speaker to be 'anchored' to the floor for a more stable/solid footing and I would guess help to transfer the vibrations/case resonance to the ground.

I used the rubber feet, it just feels more stable to me this way.


Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70
Re: Speakers just arrived! Question.
jakewash #255762 04/06/09 10:26 PM
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davekro Offline OP
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Just the man to ask the next question. My speaker switch is not an A/B selector. I need to push A on, hopefully after turning B off and visa versa. With 4 ohm 80's and 8 ohm 60's, if I accidentally had them both on for a second (or more), I wonder if it would damage (fry) that section of the 1909? My buddy calculated the mix of the 6 & 8 ohm impedances would yield ≈ 3.4 ohms.

If that sounds about right, I wonder if a short time of a load like that (by accident) would fry those channels.


Dave

"In theory, practice and theory are the same. In practice they're not."
Re: Speakers just arrived! Question.
davekro #255763 04/06/09 10:43 PM
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The Denon should just shut down if it finds the draw is to much.

Looking forward to your thoughts.


Rick


"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud

Re: Speakers just arrived! Question.
Wid #255768 04/06/09 11:38 PM
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I think you are looking at 2.67 ohms with 4 ohms and 8 ohm speakers running in parallel.


-David
Re: Speakers just arrived! Question.
terzaghi #255778 04/07/09 12:45 AM
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Congrats Dave ... you know the drill regarding new digs, pictures and posting. ;\)

What'r you doing, keeping whichever set of speakers you fancy and sending the others back, regarding the 80s and 60s?


Rick
Our Room

smile
Re: Speakers just arrived! Question.
RickF #255784 04/07/09 01:11 AM
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Wow! M60's and M80's in the house! Sweet! \:\)


I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne
Re: Speakers just arrived! Question.
davekro #255794 04/07/09 01:52 AM
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Dave, your friend is correct at 3.4 ohms if the two parallel impedances are 6 and 8 ohms; David is correct at 2.67 ohms if the two are 4 and 8 ohms. The calculation is that the sum of the reciprocals of the individual impedances is equal to the reciprocal of the combined impedance; e.g., 1/4+1/8=1/X, 3/8=1/X, X=8/3, or 2.67 ohms. That's the math, but we really don't know what the actual real world result will be at any instant, since that depends on what the impedances of the two speakers would be at the frequency being played at that instant and we have no M60 impedance curve available, apparently.

Having said all that, don't worry about it. The 1909 doesn't know what the impedance of the speakers it's connected to is, just that it has to supply a certain voltage and current at each instant. If the short term current was extremely high because of an extremely low impedance(not the numbers we're talking about)the protective circuit would shut down immediately. If over a considerable time(which you wouldn't likely allow)the current caused overheating to build up, again the protective circuits would cause shut down without permanent damage.


-----------------------------------

Enjoy the music, not the equipment.


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