Need Series & Parallel Combination Info

You need to think in multiples of three here. Here is how I would do this. I would break the subs into sets of 3.

Option 2 (series) = 12 ohm load Speakers wired in series Recommended Amplifier: Stable at 4, 2, or 1 ohm mono

This is a series circuit. Think of this configuration as one sub that has a impedence of 12 ohms. So what you have is three sets 12 ohms speakers. The next stage is to wire the three sets of speakers in a parallel circuit like this. Option 2 (series/parallel) = 4 ohm load Voice coils wired in series, speakers wired in parallel Recommended Amplifier: Stable at 4, 2, or 1 ohm mono

You could also have three 4 ohm woofers in each group wired in parallel netting 1.333333 ohms (see below). Now wire all three groups in series . This will net a 4 ohm mono load (1.333 + 1.333 + 1.333 = 4).

the12volt • Support the12volt.com

When you go to the link the12volt showed you above, you will also see a parallel calculator next to the series calculator.  Use the combination of these two calculators to figure out wiring for any number of woofers.  Depending on your system design and power availability, dropping the total number down to 8 subs will give you some different available loads.  As shown above, think of any number of subs as groups of even amounts, so with nine subs you have only one choice - groups of three.

However you end up deciding to do this, draw up a wiring diagram to use.  Then place that diagram with the subs for future reference.

The wiring as you described on page 4 of that link is a correct series/parallel scheme.

But then you stated that the load amounted to 6 ohms.  These are 4 ohm subs, correct?  It is a 4 ohm load as forbidden and 12volt stated above.  Typo?

You currently have this 4 ohm load bridged to the Rockford amp for about 100 watts to each sub.  You wrote that you are using this setup until you can buy another T15002 amp.  My question is this:  how will you be able to incorporate a second amplifier with this group of nine subs?  If you've figured that out let me know how because I can't see the possibility.

Nice job with that FG baffle.

Those are 200 watt RMS subs, so three of them on an amplifier would like to have up to 600 watts.  Three SVC 4 ohm subs wire to either 12 ohms or 1.33 ohms.  The T15002 is a two-channel amp, so with three subs you will be bridging.  1.33 is far too low of a load to bridge, so you would have to use 12 ohms load per set of subs.  With an output of 1000 watts into a bridged 4 ohm load, you can calculate that the amp would make 375 watts into a bridged 12 ohm load.  375 * 3 amplifiers = 1125 watts.

That's not very much more power than you have right now using just one amp with 1000 watts.  You may not even be able to distinguish a quality difference and you certainly won't notice much db increase if you do at all, and to show for it would be the cost of two more of these amplifiers.

See what I meant when I said I don't see the possibility of adding more of this particular amplifier for more output?  If you want closer to 200 watts per sub with this set of nine, you'll have to use just one two-channel amplifier that makes more power than the T15002 does.  Or the best bet...if it seems loud enough like it is, leave it with just the one amp.  Although the subs can take 200 watts, they are perfectly comfortable receiving 110.

If you knew then what you know now,

• You wouldn't have designed that box for nine subs, or
• You wouldn't have chosen SVC4 ohm subs, or
• You wouldn't have chosen a two-channel amplifier

A change you might consider for the future would be to trade out all nine of those subs to 8 ohm ( or DVC 4 ohm) versions.  This would net a 2 ohm load on the amp, and since it's capable of a 2 ohm bridged load, it would ouput an additional 500 watts.  Your wiring diagram would stay the same with the only exception that each sub's coils would be wired in series, which is just a connecting wire from coil 1 - to coil 2 +.  No changes to wiring within the structure itself.  You might as well use the amp for all it's worth (never thought I'd say that but we are talking about 9 subs here) for that kind of expense.  1500 / 9 = 166 watts per sub, which isn't too bad (of course, we don't know what the DVC 4 sub is yet).  I don't know how the amp performs as I'm not familiar with it, and loading it at 2 ohms would put it to the test, but that's what it says it will do.