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#255753 - 04/06/09 05:55 PM Speakers just arrived! Question.
davekro Offline
aficionado

Registered: 02/12/09
Posts: 562
Loc: Discovery Bay, CA
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...


Edited by davekro (04/06/09 05:56 PM)
_________________________
Dave

"In theory, practice and theory are the same. In practice they're not."

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#255756 - 04/06/09 06:08 PM Re: Speakers just arrived! Question. [Re: davekro]
Adrian Offline
axiomite

Registered: 12/27/08
Posts: 6613
Loc: It's all about the location.
\:\) Congrats, Dave...a busy evening lies ahead!!
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Half of communication is listening. You can't listen with your mouth.

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#255757 - 04/06/09 06:16 PM Re: Speakers just arrived! Question. [Re: Adrian]
davekro Offline
aficionado

Registered: 02/12/09
Posts: 562
Loc: Discovery Bay, CA
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."

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#255758 - 04/06/09 06:18 PM Re: Speakers just arrived! Question. [Re: Adrian]
jakewash Offline
shareholder in the making

Registered: 12/26/03
Posts: 10399
Loc: Calgary, Alberta
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
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#255762 - 04/06/09 06:26 PM Re: Speakers just arrived! Question. [Re: jakewash]
davekro Offline
aficionado

Registered: 02/12/09
Posts: 562
Loc: Discovery Bay, CA
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."

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#255763 - 04/06/09 06:43 PM Re: Speakers just arrived! Question. [Re: davekro]
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6722
Loc: The Peoples Republic of Il.

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


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#255768 - 04/06/09 07:38 PM Re: Speakers just arrived! Question. [Re: Wid]
terzaghi Offline
connoisseur

Registered: 04/04/07
Posts: 4848
Loc: Tulsa, Oklahoma
I think you are looking at 2.67 ohms with 4 ohms and 8 ohm speakers running in parallel.
_________________________
-David

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#255778 - 04/06/09 08:45 PM Re: Speakers just arrived! Question. [Re: terzaghi]
RickF Offline
axiomite

Registered: 02/26/05
Posts: 5210
Loc: Vero Beach, Florida
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

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#255784 - 04/06/09 09:11 PM Re: Speakers just arrived! Question. [Re: RickF]
BlueJays1 Offline
connoisseur

Registered: 09/19/08
Posts: 4080
Loc: Porch,enjoying Bombay Sapphire
Wow! M60's and M80's in the house! Sweet! \:\)
_________________________
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-Max Payne

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#255794 - 04/06/09 09:52 PM Re: Speakers just arrived! Question. [Re: davekro]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10406
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.
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