I don't know what kind of Amp you have, but you have to bridge the channels together.....For example, on a 2 channel amp you would just take the + wire from the Left channel and the - wire on the right channel and run it to the speaker. This uses the combined power from BOTH channels and funnels it right into the speaker. I hope you have a low frequency filter "LPF" adjustment. In case you are unfamiliar with this term, LPF is a function that most top-shelf amps have which will cut out most all mid-range and all high-range frequencies and put out only LOW (BASS) frequencies......At any rate, since you have a 4 channel amp, to bridge all 4 channels is a little more complicated so I am not going to elaborate too much information as of now only because I don't want to confuse you, or give you the wrong information pertaining to the wrong type of amp and have it blow up as a result of confusion....But you can bridge 4 channels typically in a similar way
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This really depends on the setup you intend to create in your vehicle.
The Amplifer (amp) needs to be matched to the speakers you intend to run.
As a rule of thumb, the power of the amp shouldn't exceed the max. power of the speaker (this may damage your speaker). Instead, the amp's RMS output power should be at 75-100% of the speaker's RATED (RMS) input power. NOTE: this must NOT be confused with max power.
Ideally, you want to run each speaker with its own amp channel.
A subwoofer will usually require a hi-power single channel amp, or a 2 channel amp, bridged into 1 (to increase power output required for the sub).
Here are some examples in simpler terms:
1 channel (hi power) amp can run a subwoofer. 2 channel amp can run 2 speakers, or 1 sub (bridged). 4 channel amp can run 4 speakers, or a combination of 2 spkrs + 1 sub (bridged), or perhaps 2 subs (bridged).
OK, I am assuming that you have 4 wires coming from the subwoofer itself. Your subwoofer has dual voice coils, this means there are two positives and two negatives. Look closely at the posts on the subwoofer and you can tell. These wires will go to your amp, all four of them. Here's the tricky part. You need to know if your amp is a monoblock (single channel) or two channel amp. Also, what ohms is it stable at (4, 2, or 1). If you have a monoblock stable at one ohm, take both positives from the sub and put to the positive of speaker output on the amp. Then put both negatives from the sub to the negative speaker output of the amp. If your sub is dual 4 ohm voice coils, this will give you a 2 ohm load. If you have a dual 2 ohm voice coil sub, this will give you a 1 ohm load. If you amp is 2 channel, just hook one set of positive and negative to one channel and the other set to the other channel. Hope this helps
In general higher speaker impedance is safer than lower impedance for the amp. Don't expect anything impressive re: audio output from a passive (unpowered) sub if your HTS says it pushes only 25 watts. Without frequency bandwidth and distortion noted the spec is virtually useless as a comparison.
The BU-1 is a powered sub that accepts either RCA Line Level or HIGH LEVEL amplifier power. If you use the latter, impedance is a non-issue because the input feeds the BU-1's internal amp, not the speaker directly. You should be okay.
Perhaps if we knew some specifics about the HTS we could do more than guess.
If you can setup the Amp as a Mono Amp this will work for you very well
unless the Amp needs a 12ω Load when setup for Mono Operations. You will want to hook the Two Subs in Series so that the Amp will see 1 8ω load. This means you will hook a wire to the Positive pole of one Sub and hook the Negative Pole to the Positive Pole of the Second Sub and hook the Negative Pole to the Amp's Negative pole. This will reduce the overall output but will end up having better reliability of the Sub since each sub will only see ½ the overall output of the Amp and you will still get the full output of the Amp.
According to the specs for the xo 1945- the output is; 50W x 4 Max Power Output , and I do not see a pre amp output listed. So I think to connect subs, you will need a separate AMP.
The way this works; the rear speaker wires from the xo 1945 hook into the Add-on amp, for example a 4 channel amp. In a 4 channel amp, the rear speakers come off two of the channels of the add-on, and the subs come off the other two channels. There is also the option of bridging two channels for more output power to ONE sub.
You did not mention what size sub(s) you were thinking of adding, but keep in mind that the ox 1945 puts 50 watts MAX per channel. So, if you add two 12" subs and a 1500 watt amp to drive them, your total sound is going to be very uneven.
If you go on line and look up auto audio or amps, you'll get a good idea of all the Sub and amp options that are available.... Hope this helps.
Make sure the gain isn't set too high. That's a very common cause of distortion. You'll never want it set above 3/4 of the way to high. It will be a small dial on your amp marked "gain".
See if your receiver has a built in crossover on the channel your amp is hooked up to and set it so the cut off is at 400hz if possible. Meaning that the receiver will only send frequencies of 450hz or lower to your amp
Look on the amp for a built in crossover to the channel your amp is hooked to and set it to 450hz.
Make sure the cable that connects your amp to your stereo isn't running near any power cables of any kind because electricity running through a power cable can be picked up and then the sound it makes will be amplified, sent to your subs and cause distortion.
Make sure your amplifier isn't grounded to
your battery as this can cause what's called ground loop noise...also distortion.
Ground your amp as far away from the amp itself and your subs as the manufacturer safely recommends.
Based on your description and on the idea of a single amp, then your plan of hooking up both the subwoofers in series (to get 8 ohms) would be the safest as against running the subs in parallel (2 ohms). This way the sub amp would not be overly loaded, you can compensate the slight loss in power by strategically positioning the 2 subs. A friendly reminder, pls observe polarity when hooking the sub speakers.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards. Thank you for using FixYa.
If the amplifier supports an RMS power output close to the RMS input power of the subwoofers then run the amplifier in stereo mode. For example 150 watts RMS X 4 channels driven at 20-20khz. (If you can provide a model # for the subs and the amp your looking at I can help you further with this decision.
Wiring for this is easy and simply involves matching the connectors for 2 of the channels (Front or Rear) to each of the subwoofers.
#2 Mono Bridged mode.
If the amplifier is lower power but mono bridgable you can bridge two Pairs of channels and power each of the subwoofers this way.
Generally speaking a 2 channel bridgable amplifier will be able to at least combine the wattage of each channel into a single monural channel and in many cases its actually higher.
So you would bridge the front 2 channels into a single bridged mode for one subwoofer. and then you could bridge the read 2 channels into another bridged mono channel for your other sub woofer.
For example if you had bridgable amplifier thats 50 watts RMS X 4 you coudl very likely (Generalization based on quality of amplifier) send 150 watts RMS to each subwoofer.
Again I would need to know what amp you're refering to to provide specific wiring instructions. Many Bridging amplifiers either have a single switch that will send them to bridged mode or you would use the positive + terminal from one channel and the negative - terminal from the other channel or a combination of both.
I can't find any documentation for your amp; it was made when Jensen was owned by Recoton, and they're no longer in business. With any 4-channel amp, you can't bridge all four channels into a single channel. What you can do, if you're connecting it to a single sub, is to bridge two of the channels into one channel and leave the other two channels unused.
It doesn't usually matter which two channels you pick, but some 4-channel amps designate channels 3 and 4 (or rear channels) for the subwoofer. Whichever ones you use should have a "LPF" or "LP" crossover setting available.