Anyone know about subs? - BMW Forum

Fox · 02-25-2004, 06:29 PM

I have this pos Vulcan 2 channel 100 watt amp. Other than that i dont know anything about it. I also have 2 sony 8 inch subs 500 watts each. I also also have these pos 6 1/2 subs that you get at walmart, the ones that come double and with neon rings around them. Personally i want to mount one sony 8 inch in my rear speaker deck with the a decent amp in the trunk.

I tried the 100 watt amp and i cant even get sound out of the 6.5s When i turn it all the way up the amp shuts off default.

Anyone got any information or what type of amp i should get?

I dont listen to rap, and not even really rock. I listen to classic rock and radio head and stuff like that. So i dont need/want this thing to be thumpin a mile down the road

bitcore · 02-25-2004, 08:19 PM

You need an enclosure for the sub for one. Secondly, you need a much more powerful amp, 1 channel is all you need for a sub. Get an amp who's RMS rating matches the RMS rating of the sub you intend to use.
If you just want that tiny bit extra bit of bass, then the one 8" will be ok.

Make sure the ohm load on the amp isn't below it's rated maximum. If the amp is crap then it's probably only about 2 ohm stable. (less ohms = lest resistance = more current = good)

Just a note, sony's car equipment is mostly crap. I believe their decision to go into the automotive business was purely a marketing decision where they tried to ride on the sony name for quality and produce terrible products. Seriously, take a look at the THD ratings on their amplifiers, 1.5% distortion and horrid signal to noise ratios. So avoid sony's car equipment if you can (EG: sell them :P ) I'm not saying their stuff wont get the "job" done, but it won't be as good as it could be,.

El Presidente · 02-25-2004, 11:46 PM

what is your budget? The majority of people here will tell you to go with JL stuff and other very high end. Its good, but its overkill for your expectations.

An MTX or bazooka amp would most likely satisfy your needs and not break the bank nearly as much as some others. If you are in a pinch power acoustic has cheap amps, but i've heard mixed stories regarding their quality.

Also, if your interested, I have a sub/dual box custom built for the e36 I need to get rid of that I'll sell for 125 plus shipping. Its built for 10s and only 1 works, you'd need to pick up a matching sub. Crutchfield had them on clareance last time I looked for like $40.

Fox · 02-26-2004, 03:47 PM

uhh my budget is like 30. I have an enclosure.. I dont want to use it. I only want to use 1 sub not 2 and i will not stick them in the trunk. its stupid to have subs in the trunk. I want to hear it, not the people around me too. I bought these subs for 30 because they were blown, they put to much power through them and burnt out the wires, so i rewired it and they are good nowl. And the 100 wat amp I got from friend for free.

bitcore · 02-26-2004, 04:01 PM

Unless the driver was made for dipole use, then I strongly sugest you use an enclosure. Enclosures make the subwoofer WORK. You need a second isolated chamber for the either side of the woofer cone to create a pressure difference inside the cab of the car. That isn't what makes other people hear the music, turning it up very loud makes it so other people hear the music. Subwoofers (or any speaker for that matter) are very complex and any minute change in temperature, enclosure size, enclosure diminsions, etc will alter it's output in surprising ways.
I sugest you ask these guys at the DIY Subwoofers Form for what you should do. Response us usually less than 24 hours and they know what they are doing... (no registration\e-mail required, anyone can post.)

WickedBimmer · 02-26-2004, 10:28 PM

ok, ur completely wrong, put ur sub in the trunk... thats the reason u get good sound... otherwise i suggest putting it somewhere like under the drivers seat etc... b/c u want the sub to be able to send teh sound n hit someththing within about 15 inches... thats how u get the best sound. just having it shoot off ur rear deck willl do nothing....
also ur cheap wal mart subs arent gonna do anything
and u wires.. i hope u got a fuse, i suggest getting sub wiring kit, as apposed to using the cheap wires the give u from walmart...

and u need to get a better amp, i suggest ebay if ur on a tight budget.. get a 400 watt 2 channel amp... that should be more than enough for ur 1 sub and 2 walmart subs...

bitcore · 02-26-2004, 10:40 PM

There's no room under a seat for a sub. Probably not even enough for a ButtKicker module.
Now for clarity:
Get an enclosure. Sealed would be your best bet for this type of music and volume. You can make one out of MDF (medium densifty fiberboard) or really really strong plywood if your desprite.
Get a more powerful amp. Otherwise, you may clip your sub to death by sending a DC bias to the driver and overheating the voice coil, causing the speaker to fail.

Sub wiring kits are expensive. If you get an amp with a built in fuse, all you need to do is run a positive wire, a negative wire, the remote on wire, and the audio input wires. Any electrical wire will do for all of the wires. Even the output to the sub. (home depot 8 gauge wire is quite cheep compaired to that "high preformance audio" wire that makes zero difference in SQ at all)

El Presidente · 02-26-2004, 11:29 PM

I have my cap wired with HD wire and it cost me whopping 42 cents. The only difference is larger coils inside compared to very fine strands.

And as for moutning it in the rear deck, you will still to have some kind of enclosure around it. Some subs are able to be used in freeair environments, but most are not. give me the model # and I will let you know. Really all speakers need some kind of enclosure. Thats why the rear speakers have the box under them--they perform better that way. Mounting the sub freeair give it too much volume and you will hear the bass, but it will be flat and lifeless, whereas you feel it with an enclosure.

BlackTape · 02-28-2004, 12:54 PM

I trust Fosgate and there POWER HX subs are as good as the JL W7 series IMO

buuhh99 · 02-28-2004, 02:06 PM

Quote:

Now for clarity:
Get an enclosure. Sealed would be your best bet for this type of music and volume. You can make one out of MDF (medium densifty fiberboard) or really really strong plywood if your desprite.
Get a more powerful amp. Otherwise, you may clip your sub to death by sending a DC bias to the driver and overheating the voice coil, causing the speaker to fail.

who needs clarity just get some monster 4000w mtxs and put them in your car it will shake like no other

go withthe trunk setup