i'll be running my entire system with an audiobahn 6x75w rms amp, and would like (most likely) a single 10" sub. any suggestions on what sub i should get? Ill bridge two of the outputs, should i be looking at single or duel voice coils? i want good clarity, not too loud but enough to feel it on the highway with the windows down. also, i'm gonna attempt to build a custom fiberglass enclosure, when its recommended that a sub have 1.0 cubic ft in a sealed box, does that include the space taken up by the cone of the speaker (like would a 1'x1'x1' box work?) or do i need to increase the size of the enclosure by the displacement of the sub?

thanks,
andrew

 

If the Audiobahn follows convention, 2x75W bridged to 1 channel should give you ~250-300W into 4 ohms. Some amps are stable into 2 ohms when bridged but you need to be sure.

Let's say the amp makes the above power into 4 ohms, get a 4 ohm subwoofer. I do not see the need for a DVC design if you are starting from scratch. Dual voice coils are most often used in series or in parallel with each other for a single net impedance. Just get the impedance you need (such as 4 ohms) if that is what the amplifier is rated for.

You do not need to accomodate for the subwoofer displacement when you build your box although I am sure I will be flamed for that comment. Together they might amass 150 cubic inches. In other words, not much. I would also look around at 10's. Some of them can go into as little as 1/2 cubic feet!

soobooroo

 

For subs, stick to JL Audio. They sound great. To be honest, I haven't heard the Polks, but I have heard lots of other brands, and JL was WAY better. a 10" JLw3 handles better than a lot 12" that cost more. Of course, I say go with a 12" JL if you want to hear it on the highway with windows down.

 

yea, i'm pretty sure bridged will give me 150w at 4 ohms, if i get a DVC sub and wire the 2 coils in parallel, will i be seeing 2 ohms?

 

Mono or bridged output for most amplifiers will generally return ~2x the wattage of a both channels into 4 ohms unless the power supply is regulated and won't allow it to do that. So 2x75W into 4 ohms = 1x300W into 4 ohm mono/bridged. You are basically looking at the 2 ohm output of each channel added together when you bridge them.

Check here:

http://www.rockfordfosgate.com/amplifiers/

http://www.bostona.com/ca_products.asp?CategoryID=19

http://www.kenwoodusa.com/product/pr...productId=2425

http://www.zapco.com/nosound/index3.html

Kicker even lists their spec's that way:

http://www.kicker.com/ShowPage.cfm?f...ml&menu=KXAMPS

JL amps are regulated so they do not increase power the way the above amplifiers do. The bridged rating of the 2 channels does not change. It is 2x75W or 1x150W into 4 ohm mono.

http://www.jlaudio.com/amps/3004.html

soobooroo

 

If your amp is the Audiobahn A6601x, it is over 200W into 4 ohm, bridged. Most likely the reason it does not put out more is that it is power supply limited. That is not uncommon in larger multi-channel amps and not necessarily a problem.

To your second question, what is the impedance of the coils to begin with? Are they both 4 ohms? If so, the impedance would be 2 ohms. If they are both 6 ohms it would be 3 if they are wired in parallel and so on.

soobooroo

 

thanks for the information soobooroo, i got one more for you, or anyone else for that matter. how does the sound quality compare between a SVC and a DVC?

 

Alpine Type R subs rock!

 

Assuming they were both manufactured by competent companies, there should be no difference between the two types. Of course you will find adherents to each philosophy but it probably has more to do with the installation rather than the coil configuration.

soobooroo

 

No harm, no foul.

soobooroo