Help with Subs and Amp (basic) - diyAudio
Go Back   Home > Forums > General Interest > Car Audio

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 21st December 2005, 06:48 PM   #1
Sedodes is offline Sedodes  United States
diyAudio Member
 
Join Date: Dec 2005
Location: Earth
Default Help with Subs and Amp (basic)

I've got a 1200 watt amp (4 channel, 300 watt) with a 1 farad cap. all coming off my Nissan (NX)'s poor little battery. It drives my four 12" subs nicely, especially with the solar "battery charge topper" I got a year ago and starts strongly every time.

I just bought two more 400 watt subs (couldn't help it, friend needed money and they were a steal) and I want to swap out my two oldest subs (which aren't even concave in the center and are made of the "standard" speaker foam). Can I do this without damaging anything or getting crappy sound/response, even though all four subs would then total 1400 watts?

If you can't tell, I don't really know much about audio and don't have the specs or names of any of the equipment (except my head unit -- a Pioneer DEH-P6500. And I have Pioneer speakers whose wattage I can't remember, but that likely doesn't matter).

All my stuff is self-installed because NOBODY is going to touch my junk-*** car but me (see: I'm broke and know the very basics of electronics, meaning if I can DIY with non-optimal results but results nonetheless I'm doing the work). I don't compete with my car or try to break windows in houses as I drive by, but I don't buy Wal*Mart stuff either. I just like to be able to FEEL my music now and then on the occasional road trip, and would like to hand-me-down the old subs to my little brother who's just getting interested in car audio.

Thank you very much in advance and sorry for n00bing up your forum Always fun to be a forum vet venturing into a new area of expertise.
  Reply With Quote
Old 21st December 2005, 07:06 PM   #2
Did it Himself
diyAudio Member
 
richie00boy's Avatar
 
Join Date: Nov 2003
Location: Gloucestershire, England, UK
If the boxes that each speaker goes in are not individual to each speaker then you need to use identical speakers all round. In fact it's best to use identical speakers all round anyway as you will get some interference around the low cut-off points otherwise.

The wattage of either the amp or the subs is pretty irrelevant unless they are wildly different.
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more.
  Reply With Quote
Old 21st December 2005, 07:26 PM   #3
Sedodes is offline Sedodes  United States
diyAudio Member
 
Join Date: Dec 2005
Location: Earth
Each box is seperate (2 subs each), but each speaker has its own terminals. The four subs I currently have (two each of two different types) are identical wattage, though I don't know the (peak watts?) or (minimum watts?) or (db?) or anything offhand.

I once heard that underpowering a sub is a damaging as overpowering it. Hence my concern, even though I've never overpowered a sub and therefore don't know how damaging it is, just that it is. Anyone care to explain the basics of speakers and subs and some of the terms I should know so as not to sound as ignorant as I undoubtedly do?

Finally, what do you mean by:
Quote:
you will get some interference around the low cut-off points otherwise.
Specifically, in regards to "low cut-off points?" I know what interference is, but interference from what/where? I used to get line noice on my rear speakers until I used the HPF settings on my head unit (high frequency pass? I don't even know what that would do. Filter out high freqs?) though I doubt this would be the same type of fix.
  Reply With Quote
Old 2nd January 2006, 09:46 PM   #4
Did it Himself
diyAudio Member
 
richie00boy's Avatar
 
Join Date: Nov 2003
Location: Gloucestershire, England, UK
If a the speakers to be used are different they must go in different boxes. Wattage is irrelevant, the sound will be different from each so separate boxes must be used.

The interference I mentioned is not interference like you think. I was talking about acoustical interference.
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more.
  Reply With Quote
Old 3rd January 2006, 06:35 AM   #5
Sedodes is offline Sedodes  United States
diyAudio Member
 
Join Date: Dec 2005
Location: Earth
OIC, thanks for the clairification. Seperate boxes will be used for each (brand) of sub (two in each box, 1 in each box on each channel).

Won't accoustical interference happen regardless? Also, why is wattage irrelevant?
  Reply With Quote
Old 3rd January 2006, 01:08 PM   #6
Did it Himself
diyAudio Member
 
richie00boy's Avatar
 
Join Date: Nov 2003
Location: Gloucestershire, England, UK
OK having two of same model speakers sharing one box is fine.

Wattage is irrelevant because the acoustic output will vary a lot between different speakers for the same input.
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
DIY basic Solve Multi-Way 1 3rd October 2006 11:09 PM
Convert floor standers to subs with Tang Band 8" subs? prerunnerv6 Subwoofers 3 26th February 2006 01:44 AM
2 subs one box/2 subs 2 boxes vetkilr Subwoofers 5 22nd February 2006 10:27 PM
A basic chipamp in a not so basic case. waltson Chip Amps 19 24th August 2005 08:40 AM
Zen (basic) and BoZ PCB ThierryM Pass Labs 0 23rd October 2003 07:57 PM


New To Site? Need Help?

All times are GMT. The time now is 11:30 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2