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post #1 of 31 (permalink) Old 03-04-2005, 08:35 PM Thread Starter
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subwoofer question

in choosing a sub, how much does it matter if it is 2 ohm or 4 ohm. what would be gained or lost by selecting a 2 over 4 ohm and vice versa.


also when a sub is decided upon how best to select an amp to drive the sub? Do you need to compare RMS values of both sub and amp?

Ex. if a 600w RMS value sub is selected what RMS value amp do i need to look at?

and I will only be having one sub installed.
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post #2 of 31 (permalink) Old 03-05-2005, 09:24 AM
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You need to match your woofer ohm selection to your amplifier ohm load capability. The ohm load of a speaker does not make it better or worse than another speaker. It is just the resistance of the voice coil.
When reading amp specs it is important to look at the RMS output with the following info:
Minimum frequency response of 20-20,000Hz (except Class D bass amps which may only be 20-200Hz)
RMS power at approx 12.5V (14.4V is not reality for most cars/systems)
Distortion preferably below 1% THD

Many low end amp manufacturers will rate peak power, or they will rate RMS power at 14.4V, 1000Hz. Neither rating is reality. That is how we have arrived at garbage amps with 2400W ratings that are 12"x12" and cost $200.
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post #3 of 31 (permalink) Old 03-06-2005, 08:04 PM
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The main things to consider when choosing an sub is:
1. What type of music do you mostly listen to
2. what size and type enclosure will your vehicle accomodate
3. how much power will you drive the sub with
4. how much do you want to spend

All are relevant to choosing a subwoofer.

as far as choosing an amp- price, name brand, and RMS power output are usually considered.

any questions, let me know.

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post #4 of 31 (permalink) Old 03-07-2005, 02:37 PM
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Quote:
Originally Posted by cltgt
The main things to consider when choosing an amp is:
1. What type of music do you mostly listen to
2. what size and type enclosure will your vehicle accomodate
I'm not sure that i understand how those matter when choosing an amplifier.

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post #5 of 31 (permalink) Old 03-07-2005, 07:17 PM
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I meant choosing a sub. My bad...

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post #6 of 31 (permalink) Old 03-08-2005, 02:57 PM
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if you want to run a single sub, then buy a 2 ohm sub (dual 4ohm voice coils wired in parallel) and a sub amp that is 2 ohm stable for max power.

If you are going to run 2 subs, buy 4 ohm single voice coils and run them parallel to a 2 ohm stable amp.

In theory, if an amp sees a drop from 4 ohms to 2 ohms, the power of the amp will double.
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post #7 of 31 (permalink) Old 03-08-2005, 07:07 PM Thread Starter
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ok...some good info so far from everyone, thanks.


One other question. is there an importance to which to buy first the amp or sub?? and then match up the sub to amp purchased or vice versa.

I am thinking the sub would matter more and I say this because of something I was told years ago by a sales rep at best buy when I was looking for home speakers. He told me no matter how much money I put into a receiver and such it will not matter with out spending money for a really good speaker.
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post #8 of 31 (permalink) Old 03-09-2005, 07:43 AM
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Get your sub and enclosure first. then buy the amp.

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post #9 of 31 (permalink) Old 03-09-2005, 08:38 AM
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Do not go out and by a cheap "imitator" amp either. One of those that claims 2000 watts for only 299.99. Get a good Alpine V-12 class D Mono power amp or Precision Power class D amp to run the sub. You will pay a little more, but it will be well worth it.

You can kill a subwoofer by not getting it enough good, clean, power.
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post #10 of 31 (permalink) Old 03-09-2005, 12:31 PM
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you can not kill a sub by underpowering it, you CAN kill a sub with distortion.

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post #11 of 31 (permalink) Old 03-09-2005, 12:37 PM
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Listen to EW and Mr. Wagon.

They know there shit.
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post #12 of 31 (permalink) Old 03-09-2005, 07:17 PM
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Quote:
Originally Posted by OneBadWagon
you can not kill a sub by underpowering it, you CAN kill a sub with distortion.

distortion is a direct effect of low power
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post #13 of 31 (permalink) Old 03-10-2005, 06:50 AM
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Quote:
Originally Posted by 91rednotch
distortion is a direct effect of low power

No Sir. Distortion is the direct effect of...

1) Incorrect level matching of the head unit and amp.

2) Over driving an amp that has insufficent power for the application.
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post #14 of 31 (permalink) Old 03-10-2005, 07:26 AM
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Quote:
Originally Posted by Samhain
No Sir. Distortion is the direct effect of...

1) Incorrect level matching of the head unit and amp.

2) Over driving an amp that has insufficent power for the application.

ok. I only worked for kicker for 2 years.
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post #15 of 31 (permalink) Old 03-10-2005, 08:21 AM
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Quote:
Originally Posted by 91rednotch
ok. I only worked for kicker for 2 years.
In the payroll department?
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post #16 of 31 (permalink) Old 03-10-2005, 08:22 AM
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Quote:
Originally Posted by 91rednotch
ok. I only worked for kicker for 2 years.
whoop de friggin doo, would you like a cookie? do you actually think that makes us go, oh he knows what he's talking about. Do you know how many reps and people that work for companies don't know shit except for what's in their little brochures and training classes?
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post #17 of 31 (permalink) Old 03-10-2005, 09:47 AM
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Quote:
Originally Posted by 91rednotch
ok. I only worked for kicker for 2 years.

That's great. I've got almost 8 years experience in the install bay. What was your job at Kicker?
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post #18 of 31 (permalink) Old 03-10-2005, 12:05 PM
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Quote:
Originally Posted by Samhain
That's great. I've got almost 8 years experience in the install bay. What was your job at Kicker?

Wow, you are a freakin installer. Congrats.


BTW, in the R&D department.
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post #19 of 31 (permalink) Old 03-10-2005, 12:17 PM
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Quote:
Originally Posted by 91rednotch
Wow, you are a freakin installer. Congrats.


BTW, in the R&D department.
and you could build me a fiberglass box? tl design box?
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post #20 of 31 (permalink) Old 03-10-2005, 12:52 PM
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Quote:
Originally Posted by 91rednotch
Wow, you are a freakin installer. Congrats.


BTW, in the R&D department.


Actually I did that during high school and college. Now I write building automation software for Nortel. So, what products were you involved with at Kicker? I have a few friends that work there.
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post #21 of 31 (permalink) Old 03-10-2005, 01:20 PM
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Actually I did that during high school and college. Now I write building automation software for Nortel. So, what products were you involved with at Kicker? I have a few friends that work there.
My God, clarify your post and dont say "i've got 8 yrs in the install bay area" for me not to think that you still do it. I worked at Kicker during the summers in Stillwater while I was at OU back in 96 and 97 most of it as an intern while I was pursing my Electrical Engineering degree. I specifically was involved with the first generation of the Kicker ZR series amps and solo-baric subs. Anything else?
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post #22 of 31 (permalink) Old 03-10-2005, 01:25 PM
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and you could build me a fiberglass box? tl design box?
Wow, I'm impressed. I wish I was 21 and knew everything again.
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post #23 of 31 (permalink) Old 03-10-2005, 01:28 PM
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Quote:
Originally Posted by 91rednotch
Wow, I'm impressed. I wish I was 21 and knew everything again.
it is nice.
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post #24 of 31 (permalink) Old 03-10-2005, 01:37 PM
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Can't we all get along??

I'm sure each of you knows a little something about the subject, but, you could both be right to a point.
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post #25 of 31 (permalink) Old 03-10-2005, 01:38 PM
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take all the fun out of it....
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post #26 of 31 (permalink) Old 03-10-2005, 01:45 PM
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I agree. Heaven forbid that more than 1 person may have a different view or opinion about something. All of this is in good fun.
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post #27 of 31 (permalink) Old 03-10-2005, 01:46 PM
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Quote:
Originally Posted by 91rednotch
Wow, I'm impressed. I wish I was 21 and knew everything again.
how old are you? you don't know anything, so it seems.

Samhain is correct, as is EW, and am I, you are not. That's the first lesson you must learn.


then go find someone to teach you what you pretend you know, and stop giving bad information out as fact.

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post #28 of 31 (permalink) Old 03-10-2005, 02:59 PM
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Time to break out the popcorn.
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post #29 of 31 (permalink) Old 03-10-2005, 03:00 PM
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Quote:
Originally Posted by OneBadWagon
how old are you? you don't know anything, so it seems.

Samhain is correct, as is EW, and am I, you are not. That's the first lesson you must learn.


then go find someone to teach you what you pretend you know, and stop giving bad information out as fact.
be careful, he may say you are young and dumb...hold on he did that to me.
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post #30 of 31 (permalink) Old 03-10-2005, 03:40 PM
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Quote:
Originally Posted by OneBadWagon
how old are you? you don't know anything, so it seems.

Samhain is correct, as is EW, and am I, you are not. That's the first lesson you must learn.


then go find someone to teach you what you pretend you know, and stop giving bad information out as fact.

Someone having a bad day?
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post #31 of 31 (permalink) Old 03-10-2005, 03:55 PM
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Quote:
Originally Posted by 91rednotch
Someone having a bad day?

No, we just don't like misinformation.
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