BLOWN WOOFER MODEL SP820 WOOFER 8 OHM , TRYING TO FIND REPLACEMENTS FOR CHURCH SOUND SYSTEM

Hi Ronald.
8 Ohm speakers will work just fine as replacements for the
6 ohm speakers. When fitting speakers you need to consider
The power handling capability. The impedance and the frequencies
involved. Power handling is expressed in wattage ie 100W.
Unfortunately this can be expressed in rms, max or peak music. The rms value (root mean square) is the only really relevant figure as this is the continuose handling power at 1 KHz. The impedance
is the resistance that the amp sees but is not a dc resistance and
varies with frequency. The lower the impedance the more power
will be drawn from the amp. In the event of a short circuit across
the speaker the amp will try to deliver infinite power into an infinitly
small load in an infinitesimal amount of time and will self destruct.
Using an 8 Ohm speaker draws less power than a 6 Ohm speaker.
Connecting speakers in parallel; results in the impedance beingreduced. For example two 8 Ohm speakers in parallel will result
in a 4 Ohm impedance load but in series will be 16 Ohms.
Incidentally the the .1 (5.1) is the sub woofer which only has
to handle the bass frequencies, a small percentage of the
amplifiers overall frequency response..
Connect your speakers and then power up the amp last
after double checking there are no shorts on the speaker
cables.
All the very best from Vintie.

You can plug in higher ohm speakers , the higher the ohm the higher the resistance is, it is a danger when you plug lower ohm speakers into a higer ohm Amp , at a high volume that will cause them to blow , the center speaker would be fine to use a higer ohm speaker , your best choice is to buy a Active Subwoofer, which means the sub has it's own power supply , and u can blast the thing as much as u like , thn u can turn the bass down on all the other speaker's so u can play it louder , and have the sub turned up has high as u like , this is the best way to get great sound with high volume , buy a Active sub woofer , any active subwoofer is ok , a active sub woofer has its own volume and inputs on the speaker ,

blown speaker or x over

I assume you mean the Pr-12RX passive? That seems wrong to me, too. Put an ohm meter across the terminals of the horn driver and the woofer seperatly to see which, if either, is blown. If they're OK, look for a bad solder joint on the crossover.

Step 1:

Hate to say it, but possibly a blown speaker. To check this, do the following -

Step 2:

Insert headphones into jack to verify for sound there.

Step 3:

Unplug unit and open rear panel to reveal speakers.

Step 4:

Remove leads from woofer.

Step 5:

Using a multimeter, set to OHM (horseshoe) to lowest setting.

Step 6:

Apply red(+) and black(-) to speaker leads. Meter should read at least 4-8 ohms of resistance.

Step 7:

If no reading, then voice coil is blown.

Step 8:

If no meter available to use, the use a 9 volt battery by applying direct connection to speaker leads in an off-and-on fashion - You should hear a "click" sound come from speaker. If no "click," then speaker is blown.

Step 9:

If click is heard, and resistance on meter is correct, then the amp circuitry leading to the woofer may be blown = repair needed.

Yes your amplifier is stable @ 2OHM but only in stereo mode. If you are running the amplifier in BRIDGE mode then the amplifier is stable only @ 4OHM. So if you are running a sub woofer and it requires a 2 Ohm mono load then the amplifier has either been damaged or is trying to protect itself from the wrong OHM load. You could also make sure that your GND is secured properly, as some times it could come lose from vibration and not offer a decent ground for the system. dreamsystems.

http://www.parts-express.com/resources/woofer-selection-guide.cfm

Sort the guide by woofer size. Measure and match the hole opening, approximate volume of the speaker box and the -3db cutoff specified by Sapphire to something in the guide. Look for 4-ohm models, of course. Also, if you know the sensitivity rating (87db or similar), shoot for the same rating.

In order of importance -

DB match - get it wrong and the speaker will sound dark or bright.
Impedance match - get it wrong and the crossover frequency will not be correct.
Volume / F3 match - Will affect bass response.

As Sapphire is long gone, aftermarket replacements are your best bet. You might be suprised at how good a shot in the dark will sound. PE has a good return policy if you take care not to mess up the drivers during tryouts.

all you need is an 8 ohm subwoofer or a Dual Voice Coil (DVC) 4 ohm subwoofer wired in series that can handle 120 Watts rms. I Went with a Rockford Fosgate Punch P1 P1S812 12-Inch 150-Watt Subwoofer - 8 Ohm

it was only $35 from amazon and is probably nicer quality than the original driver. Good Luck

www.the12volt.com/ subwoofer wiring diagrams and then find out what ohm of sub u have and how many voice coils and what ohm your amp is stable at.

Did you try making sure the subwoofer is turned on under the set up menu on the Sony Receiver?

Press Set Up, Press the left or right button above the scroll wheel until you get to SW. It should say SW: ON or SW: OFF. If it says SW: OFF, use the Scroll wheel to scroll right until it says SW: ON. Also, make sure you aren't in 2CH mode, try A.F.D or surround sound.