Question about Yamaha YST-RSW300 Subwoofer

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When i put my ear to the front of the sub, it makes a sound more like a rattling / grumbling than a clear bass sound. Is this normal sub function or is there something wrong?

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It sounds like you subwoofer may have a blown speaker.
If it is new, take it back and replace it.

If it's not under a warranty, take the case off and examine the speaker. If you see a tear in the fabric part of the speaker cone, or along the edge... it is a "blown" speaker.

These can be fixed, but you will more than likely have to take it somewhere to get it done. If there is a company near you that does professional car installations, they will more than likely be able to fix it... or should at least know someone who can.

Posted on Apr 02, 2011

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Posted on Jan 02, 2017

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Wire 1 sub to one channel and the other sub to the other channel.

Turn down your gain as low as possible and then power everything up.

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H?,
You have a very good system...one of the best of SONY..SUB does not get activated automatically especially on STEREO mode.DIRECT STEREO Notes • No sound will be output from the subwoofer.
.your system has Dedicated Power Amplifier for 2 Externally Driven Sub-Woofers (200W RMS x 2)..in order to activate the sub woofer amplifier you need to make a selection on the surround modes while you are switching the modes of the surround you will see the speaker position on the display of receiver as well..if you do not see the sub woofer it wont be activated..Sound Field Program (A.F.D) is a good example to test it..
Take care and please Remember to rate/vote and give me 4 Thumbs Up
for Helping out the Community :)

Hope this helps!

--------------------
Additionally please follow the instruction on your user manual to activate the SUB ,as is follows..

-----------------
BASS-OUT
Low-frequency (bass) signals can be directed to the
subwoofer and/or the front left and right speakers
according to the characteristics of your system. This
setting also determines the routing of the LFE (low-
frequency effect) signals found in Dolby Digital or DTS
sources.
Choices: SWFR (subwoofer), FRONT, BOTH
• Select SWFR if you connect a subwoofer. LFE and
low-frequency signals from other channels are directed
to the subwoofer according to the speaker settings.
• Select FRONT if you do not use a subwoofer. LFE and
low-frequency signals from other channels are directed
to the front speakers according to the speaker settings
(even if you have previously set the front speakers to
SML).
• Select BOTH if you connect a subwoofer and you want
to output low-frequency signals from front channels to
both the front speakers and subwoofer. LFE and low-
frequency signals from other channels are also directed
to the subwoofer according to the speaker settings. Use
this function to reinforce low-frequency signals using
the subwoofer when playing back sources such as CDs.

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First of all you need to know your enclosure. If you have a ported enclosure tuned in the mid to low 30's you may want to set the low pass to around 70-80 hz with your sub sonic set at 30 hz. this will give you the higher bass frequency you need for the loud bass you want, and protect the sub from going too far below the tuned frequency of the enclosure, and losing it's composure.

As far as the gain, and bass boost are concerned, you just have to adjust them by ear. First adjust the radio volume to normal listening levels, by that I mean as loud as it can go without the speakers in the car sounding like ****. Now you adjust the gain first. slow turn the gain control, carefuly watching and listening to the sub.. Adjust the gain to the point of the woofer getting a lil sloppy then back it down a bit until the sound is clean again. Now do the same with the bass boost. if there is a bass boost frequency adjustment, set that as close to the tuned frequency of the box as you can.

If you are in a sealed box the adjustments are a bit easier, and are all about taste. Adjust the radio as described before, and put on your favorite song. Next start udjust thing lowpass frequency to taste, not too high tho, try not us higher than 100 hz in your sub's for better sound. Sub sonic is not quite as important in a sealed box, as there is much less danger of the sub losing control.

Well good luck, and hope this helps!


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1 Answer

SUB PULLS IN INSTEAD OF PUSHING OUT


In a normal subwoofer it does pull in and push out to create the sound. It could be that the voice coil is damaged (by over excursion running it into the magnet) and it now can't push out past a certain point hence looking like it's pulling in. Push in on the woofer with your hand, do you hear a scraping sound? If so it's time for a new sub. If not, take it out of the enclosure and push out on the cone from the inside, scraping now?
Another test for loose voice coil windings that I find works is the hold the sub up close to your ear and bang on the magnet with the palm of your hand, if you hear faint rattling or anything other than a low "thud" sound then there's is some sort of mechanical failure within the woofer............also time for replacement.

If all seems good at this point, try connecting it to a different amplifier, the sub itself may be fine. If you've lost one of the amplifier rail voltages the sub will pull in but not push out...(or vice versa depending on if it's the positive or the negative power rail)......and yes, it would sound distorted.

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