new interconnect cable problem
dronescope59
Posts: 9
I just picked a very nice set of SDA 1c speakers. I'm running them with a Yamaha RX-V2700 receiver and they sound great. I ordered a real nice heavy duty interconnect cable
and hooked it up. Now I can only play the speakers at a low level before the receiver shuts
down and flashes. "Chk Spk. wires". Check speaker wires. Without the cable the speakers
crank. Any thoughts? Thanx!
and hooked it up. Now I can only play the speakers at a low level before the receiver shuts
down and flashes. "Chk Spk. wires". Check speaker wires. Without the cable the speakers
crank. Any thoughts? Thanx!
Answers
-
Hello,
Welcome to Polk's forum. Is the Yamaha able to be connected to a common ground speaker system? You might have to check with Yamaha for a definitive answer. Also, does the Yamaha go into protection mode at lower playing volumes with the SDA cable attached? The speaker's impedance is lower when the cable is used. -
Thanx for your reply. Speakers play great and very loud without the cable interconnect
hooked up. (using the Yamaha RX-V2700) a 2009 model. When I install the interconnect
cable, the Yamaha shuts down at a very low volume level. Should I change the Yamaha
speaker settings from 8 to 6 ohms? -
Receivers are common ground. The issue is the impedance.
You can try the impedance selector switch, it may work, for awhile. You'll need a good high current amp rated to 4ohm.
My Yamaha RX-v992 was killed by a set of SDA 2a speakers that dropped to 3 ohm.
Half the drivers and half the tweeters as your SDA 1c
Here's the problem with that switch. It restricts current coming from your amp to the speakers. Your speakers thrive on good solid current.
Post a picture of the cable ends you bought -
Yes, switch the receiver to 6 ohms and see if it will drive those speakers. Keep the volume down as your receiver, any receiver, cannot provide the current needed to provide loud listening levels without damaging drivers.
This is what causes speakers to blow tweeters, not enough current.
I’d advise you don’t crank them up with that receiver, or any receiver.
Those Polk’s really need a 4 ohm capable amplifier.
You are putting that receiver into protection mode.
If you continue doing that you’ll be replacing drivers asking why you’re blowing your speakers…..
-
My thoughts SDA2c studio look like SDA1b, same driver arangement with the exception the 1b starts at 4 ohm and drops to 3ohm. The early SDA1c some had a blade/blade IC socket JUST like the SDA1b. The pin/blade SDA1c only the pin carries the SDA signal. The SDA 1c and SDA1b used 3 different drivers, 1b all MW6509 1c used 2 MW6510, 2MW6511. Too many have confused the SDA1b for the SDA1c studio. If this is truly a SAD1b then that is the problem, again ohms drop way too low for that receiver, no matter the volume.
-
Things are not good! I substituted a Marantz SR6007 receiver for the Yamaha
RX-V2700 with interconnect cable attached. Everything was fine and I could
play the music at any level. Turned the volume down and then turned on my TV
which was also connected to the Marantz. She (the SR6007) immediately shut
down and started to smell burnt. Looks like that receiver is ruined. I can't
believe the Yamaha RX-V2700 with 140wpc and massive power supplies and
an MSRP of $1700 in 2009 can't run these speakers. What am I missing? -
When you say, "turned on my TV" do you mean switched from another source to the TV? If so, can you explain how you get an audio signal from the TV to the Marantz?
-
No. I just turned on the TV while the audio source was still playing. I didn't change the source
on the receiver -
I don't believe there was any connection between turning the TV on and the Marantz having a problem, just an unfortunate coincidence. When a speaker has a low impedance, especially at lower frequencies, it means more current has to flow from the receiver to maintain the same volume level. Receivers are constantly juggling supplying voltage and current (water pressure and gallons per minute) depending upon what the musical content is and the second-to-second volume demands. Transistors have a characteristic called "thermal runaway" where as the transistor gets warmer it can conduct more current. As it conducts more current it gets warmer which allows for more current to be delivered to the speaker. You can tell where this is going, right?
Receivers, in general, are devices that contain lots of features and have to be competitive to attract buyers. Power supplies (transformers, filter capacitors) and output transistors are among the more expensive components and are often chosen based upon "dollars per watt" basis. This limits what choices the designer has to make. -
Can anyone recommend a power amp, maybe a few years old, that you know works
with these speakers? I'll pre-out it to my Yamaha receiver.Thanx! -
What's the budget?
You'll want to stay on the cheaper side if using your receiver as a preamp.
-
I have an Onkyo RX-Z50 receiver I can use. It has a dedicated 4 ohm setting.
Only about 3 years old and 120 wpc. Wonder if this receiver would run the
my SDA 1c? -
Never mind, where's my frosty beverage.
-
Sunfire, Aragon 4004mk2, 8008bb, Parasound, B&K, the list goes on.
What you need to look for are amps that double or nearly double from 8 ohm to 4 ohm. My Aragon 8008bb doubles down to 2ohm. Some Krell amps double down to 1 ohm. Everything I have listed has goobs of current to go with those watts. Your Yamaha has 140 wpc at 2 channels BUT runs out of gas with more than 2 channels in play. Some Yamaha receivers are down to 50-60 wpc at 5 channels. The current reserve at 4 ohms is nil. So you take that 140 wpc at 8 ohm and that power supply probably has a hard time creating 150 watts at 4 ohm.
My Aragon 8008bb is 200@8ohm, 400@4ohm and 800@2ohm.dronescope59 wrote: »I have an Onkyo RX-Z50 receiver I can use. It has a dedicated 4 ohm setting.
Only about 3 years old and 120 wpc. Wonder if this receiver would run the
my SDA 1c?
That dedicated 4 ohm setting just chokes it, it strangles the current so the receiver doesn't melt down You're missing the point.
Please pull a midwoofer and give us the number on the midwoofer, it will be mw6xxx
Also post a picture of this interconnect cable ends please. We cannot help you if you don't help us help you with pictures so we know what you and we are working with. -
-
UPDATE. I ordered a Crown XLi 800 amp to run the Polks. ANYWAY, in the
meantime, I had the speaker wire crossed on the right speaker. (positive to
negative), fixed it and hooked the interconnect cable up again and everything
seems fine with no issues at higher levels. Now I have to decide if I should
cancel the Crown amp order. Thanx for the help.
-
CANCEL and get a proper stereo amp.Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
Get away from a receiver driving speakers that are 4 ohm with dips, at certain freq’s, that go below 4 ohms.
Watts aren’t only just watts.
Maybe some research would help you understand what the folks here on Polk are recommending.
Robert Harley’s books on audio is a good place to start.
Skip
P.S. That type of crown amp is good for freq’s below 120 hertz. Basically driving the woofer section in a bi-amp setup or to drive a subwoofer.
Read up to understand the reasons why. -
UPDATE: On vacation for a couple of weeks. About a week ago, I picked up
a like new ONKYO TX-NR809 for less than $100. The unit is 4 ohm certified so
I figured there would be no harm in trying to run my recently acquired SDA 1c speakers.
Low and behold, this receiver has no problems running these speakers at insane levels
with no problems whatsoever, even with my new interconnect cable attached. Unlike before
the tweeters never go into protection mode at any level which was surprising. -
Six frosty beverages and a joint should be enough to maker er clip.
-
dronescope59 wrote: »UPDATE: On vacation for a couple of weeks. About a week ago, I picked up
a like new ONKYO TX-NR809 for less than $100. The unit is 4 ohm certified so
I figured there would be no harm in trying to run my recently acquired SDA 1c speakers.
Low and behold, this receiver has no problems running these speakers at insane levels
with no problems whatsoever, even with my new interconnect cable attached. Unlike before
the tweeters never go into protection mode at any level which was surprising.
What you dont realize with that AVR is when driving less than 8 ohm loads it restricts current to prevent it from cooking itself. SDA speakers thrive with high current amplification.Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
The receiver does advertised itself as "high current". What problems could occur?
Everything has been fine for a week. I have AC Infinity fan on top of the receiver
to keep it cool-running. -
dronescope59 wrote: »The receiver does advertised itself as "high current". What problems could occur?
Everything has been fine for a week. I have AC Infinity fan on top of the receiver
to keep it cool-running.
High current at 8 ohms maybe, not 4. It's an AVR, not a stereo integrated or separates.
Problems? It's an AVR, you're not going to get the best out of the speakers.Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
dronescope59 wrote: »UPDATE...this receiver has no problems running these speakers at insane levels...the tweeters never go into protection mode at any level which was surprising.
Ya, I remember when I was 15 and stoned as a bejesus a$$.
Kidding, I don't remember anything from back then.Gustard X26 Pro DAC
Belles 21A Pre modded with Mundorf Supreme caps
B&K M200 Sonata monoblocks refreshed and upgraded
Polk SDA 1C's modded / 1000Va Dreadnaught
Wireworld Silver Eclipse IC's and speaker cables
Harman Kardon T65C w/Grado Gold. (Don't laugh. It sounds great!)
There is about a 5% genetic difference between apes and men …but that difference is the difference between throwing your own poo when you are annoyed …and Einstein, Shakespeare and Miss January. by Dr. Sardonicus -
I don’t think they actually made any high watt high current receivers.
To get any where close to that you’d have to go vintage 2-channel receivers.
My Sansui g-9000 was -
Dang it…..
That receiver was 160w per channel @ 8-ohms. It did have a 4-ohm rating but, I wouldn’t want to try and drive Any infinity Kappa 8 speakers with it.
And, only stereo capable, 2 channels.
Sansui made some really high powered receivers back in the day.
Can you say Sansui g-22000 & g-33000?
Pioneer’s sx-1980 would be a good candidate too.
The transformers in those receivers were quite large/heavy and, they were only driving 2 channel stereo setups.
Not that way today.
