Question about JBL Northridge E 250P Subwoofer

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Hi sub make funny noise only when phase switch is at 180 when turning on like a scratching sound when it first recieve signal from reciever jbl e250p no popping sound when playing music its plays perfect only when i first turn it on for 1 second

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Kenwood SW-32HT Subwoofer Dropping sound Yamaha Reciever


Several possible answers. First - is that the Yamaha has a fault that is sending a signal with too much power on it. And the sub detects this and switches off.
Second - either the Receiver or Sub is switching off when no audio is present. A setting problem?
Third - the sub has a fault, possible overload, and goes to standby for safety.

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New polk psw110 sub for rca rt2250 reciever


Hi there.
To answer your question;
There is no problem in using both subs at the same time. As a matter of fact you could split your signal in ten and have a sub for each one of them.
You`ll just have to set the subs levels so they match each other and i`d say the more sound to the larger sub.
Just try it at different sound level and you`ll find the correct setting.
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Dec 29, 2009 | Audio Players & Recorders

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Sub doesnt do anything while plugged in ( Sunfire mk II)


Some subwoofers can sense the signal on their input and will only start when there's enough signal for long enough time for them to turn on the amp.

Try seting the "subwoofer signal out" on your reciever a bit higher, see if it does the trick, if not, try it with some other source (e.g. an mp3 or CD/DVD player) plugged directly into the subwoofer. If it still doesn't work, there's some other problem with your sub (bad connection inside sub, sub amplifier problems, maybe there's another fuse for the speaker itself, try to check it out).

If it works well with an alternate signal source, the problem might be either in reciever or the signal cable that you use, but could also be something else.

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Jul 15, 2009 | Sunfire True Sub MK II Subwoofer

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Hooking up surround sound to t.v.


Start with the receiver. If your speaker connections are done and you have good sound coming from the speakers, connect your components (xbox, dvd player, cable box, etc) to the appropriate connection type on the back of the receiver (HDMI, Component, etc for video; Optical, Coaxial, or analog for audio). Next, find the "Monitor Out" connection and hook that to an input on your television. The receiver should take care of the rest in the setup menu. To program your receiver i suggest downloading the user manual (search google for the make and model number of your reciever you should be able to find one available).
Things to remember.. your reciever may not "up-convert" video signals, which means if you hook Component into your reciever from, say, a dvd player and your Monitor Out is HDMI to the TV, your receiver might not switch the connection for you. If you end up with good audio but no video on an input, this is why. Try running that same video type (Composite, Component, HDMI, etc) to the TV from a seperate Monitor Out.
Your subwoofer, which I am assuming is a "Powered" type that plugs into a receptacle as well, plugs into the back of the reciever on the "Subwoofer Pre-Out" connection. If it is "Passive", which is unlikely, let me know.
The rest is programming, which is usually done in the setup menu or main menu for your receiver. Again, I recommend downloading the manual from a good website.

Apr 11, 2009 | Panasonic Televison & Video

1 Answer

Yahmaha rxz9 no output signal to sub


the part where you plug in the sub has blown or warn out over night dude get it repaired i think u need to change the fuse inside the reciever

Dec 31, 2008 | Yamaha RX-Z9 Receiver

1 Answer

Even Distribution


i have same speakers try these setting and tell me what you think put phase at 180 and put switch on lfe mode not normal for some reason my sub plays louder on these setting verse phase on 0 and lfe switch on normal i have power on subwoofer a little more than half also set croosover to 80hz you will never touch it again

Dec 05, 2008 | JBL Northridge E 250P Subwoofer

1 Answer

Connection a JBL surround cinema speakers with sub to a Yamaha


if you do not have the digital hook up from the tv to the reciever
304c659.gif then you will not get the subwoofer sounds or the dolby digital sounds
if you don't have this on your tv then just turn off the dolby digital when watching the tv , and you should be able to hear the subwoofer thru the virtual surround sound
hope this info is worth a fixya and if you need other help then just ask me and
i'll be glad to help

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1 Answer

Nakamichi AV-10 loud thud from subwoofer


I don't know the design of this reciever, and do not have any schematics or engineering information to know the design.

This is a general comment:
In many of these recievers at this level they don't have very good muting designed in to their system. When switching sources, the audio is not being muted.

This is a theory of why the noise is not on the main speakers, but present on the sub woofer. Because the switching noise is of very low frequency, this is why the sub woofer is making noise. The main speakers lack the low frequency sensitivity that the sub woofer has. This is one way of looking at it. It is also possible that there is muting for the main speakers, and none for the sub woofer.

If the reciever does have muting in to its design that is supposed to mute when switching modes, then there is an obvious defect. When a source is switched, or a mode is changed, the output would mute for the duration of the switching interval. This is usually for a period of about 100 ms.

Your best bet is to contact the service rep for nakamichi and ask the question there.

I have serviced many recievers made by other manufactures. The higher end models all had muting in their design. This way, the output was muted when the source was changed, and when the reciever was turned off or on.


Jerry G.



Apr 23, 2008 | Nakamichi AV-10 Receiver

1 Answer

Apline mrv-1000 2 infinity sub


RMS power at 12V 20Hz-20kHz
2 x 100W @ 4 ohms (0.08% THD)
2 x 200W @ 2 ohms (0.3% THD)
1 x 400W @ 4 ohms bridge (0.3% THD)

That amplifier is not 2 ohm mono stable in bridged mode (assuming subs are SVC 4ohm).
It is seeing too much resistance and overheating. Thermal overload protection kicking in.

The phase switch allows you to switch from in phase to 180* out of phase. This feature is not to taken as written in stone. In some rooms, or locations of a room, the output will sound louder/better either in phase or out of phase. So there is no correct setting. It all depends where the sub is located and the acoustics or shape of the room.

Phase is term that describes multiple characteriscs and behavior of a speaker system.

Phase alignment: The vertical alignment of the voice coils of all the speakers in a speaker cabinet, so that all signals reach the sweet spot at the same time.

Crossover phasing: If one or more crossover slopes are of a different slope, then the speakers would not fire at the same time, causing delays in response.

Reverse polarity: You may reverse the polarity of a speaker to make the speaker fire inwards instead of outwards to improve alignment with the other speakers in the system. This is very common in tweeters circuitry. As for woofers, if the polarity is reversed, there is usually a cancellation of bass, to a degree.

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There is no sound on my powered sub


Since you have a powered sub, the feed to it is a line level signal. If your unit is only 6 months old, it should still be under warranty. Check. If it is under warranty, have it repaired under warranty. Otherwise, update this and we'll dig deeper.
Dan

Aug 06, 2007 | Pioneer VSX-816-K/S Receiver

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