In one sentence, describe what the following article is about: If your area experiences a period of drought, water the soil lightly to help the tree survive. Add enough water to moisten the soil about 3 in (7.6 cm) deep.  You can test the soil by pushing your finger into it. If you can’t push down to the roots easily, the soil needs water. An irrigation system works well for greenhouse growing. Give the guanabana plenty of fertilizer every year to help it grow and produce fruit. You can add fertilizer a month after planting or around March. Apply a second dose in early September.  You can use a balanced 10-10-10 fertilizer from your gardening center, which has equal parts phosphorus, nitrogen, and potassium. Apply 1⁄4 lb (0.11 kg) of fertilizer in the first year, 1⁄2 lb (0.23 kg) in the second year, and 1 1⁄2 lb (0.68 kg) every year after that. Check the mulch layer before you add new fertilizer. Add a new layer of an organic material, such as compost or pine bark, in early spring. Then, you can finish tending to the tree by putting the fertilizer on top of the mulch. Replace the mulch every year to block out weeds and keep the surrounding soil moist. Wait for the guanabana’s trunk to become at least 1⁄2 in (1.3 cm) thick. Using pruning shears, cut the branches down until the tree is about 30 in (76 cm) tall. Then, wait for new shoots to grow. Regular pruning helps your tree grow evenly so more water and sunlight reach the roots.  New shoots will grow on your tree. Select the tallest shoot to be the central leader, then select 3 or 4 shoots spaced around it to be main branches. Wear a thick pair of gardening gloves and safety goggles to protect your eyes. Trim the central leader to about ⅓ of its original size. New shoots will begin forming around the cut. Choose the tallest shoot again, then pin the other shoots down so they are horizontal.  You can pin down the secondary shoots with clothespins or twine. Also remove any diseased or decaying branches on your tree. Although guanabana trees do not attract a lot of pests, some bugs can be an issue. Mealybugs are common, along with lace-wing bugs, moths, and fruit flies. Look for holes in the leaves, bark, or fruit. Spray a pesticide directly onto the plant.  Consider using natural methods of pest treatment, like insecticidal soap or horticultural oil. Wear a respirator and eye protection when spraying chemicals. Keep people and pets out of the area. Root rot is a disease some guanabanas experience. This is usually caused by too much water.
Summary: Water the tree when the soil dries during a drought. Fertilize the tree in spring and fall. Renew the layer of mulch every year. Prune the tree down in the first year. Reduce the tree’s size in the second year to encourage growth. Use an insecticide to treat infestations.

In one sentence, describe what the following article is about: The wiring here will be similar to wiring a single voice coil (SVC) sub-woofer. The difference to remember is that dual voice coil (DVC) subs have two coils, and thus four input terminals. Two of them are positive and two are negative. Choose one of the positive terminals and connect it to the positive bridged terminal of the amp. Just like wiring two separate speakers, the two coils within your DVC can be wired in series (increasing the sub's impedance) or in parallel (decreasing the sub's impedance).  If you are wiring the coils in series then run a wire from the positive terminal of the first coil (the one wired to the amp) to the negative terminal of the second coil and from the negative terminal of the first coil to the positive terminal of the second. If you are wiring the coils in parallel then run a wire from the first positive terminal to the second positive terminal and a wire from the first negative terminal to the second negative terminal. Again, you have the series verses parallel debate.  If you choose to wire the subs in series, connect the negative end of the second coil in the first sub to the positive end of the first coil in the second sub (these circuits can get complicated fast). Next, connect the negative end of the first coil to the positive end of the second coil. Finally connect the negative end of the second coil to the negative bridged terminal on the amp. If wiring in parallel, connect the negative end of the first sub's second coil to the negative end of the second sub's second coil. Connect the positive end of the first sub's first coil to the positive end of the second sub's first coil. Follow the same guidelines as when you connected the first sub's coils. Now comes the easy part. Regardless of which combinations of series and parallels you chose above to get the proper impedance and power distribution in your system, closing the circuit will be one easy step. Run a wire to connect the negative terminal of the second coil in your second sub to the negative bridged terminal of the amp. Power up your system and test it out. Start at a low volume and then slowly increase it to listen for anything that doesn’t sound right, like static or a difference in volume between the two subwoofers. If the bass and sub-bass are quiet or not present at all, something is mis-wired.
Summary:
Wire the amplifier to the first subwoofer. Connect the two coils. Wire the second subwoofer to the first subwoofer. Connect the second sub's coils. Complete the circuit. Listen for inconsistencies.