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View Full Version : What rms rated and peak power rated 6X9's can I use on my MTX Blue Thunder Pro 400x5



89Eldorado
01-17-2012, 01:28 AM
i want to buy 2 pairs of 6x9's to push with my mtx blue thunder pro 400x5. What 6x9s can my amp push and can i also hook up a pair of polk audio db351 on this amp or should i hook em up to another amp if so how many watts on the amp, im not trying to burn none of my tweeters on my speakers as i usually do.

trumpet
01-17-2012, 12:07 PM
That's a nice old school amp. Back in the 90s when that was made 25 watts per channel was plenty. You can run whatever 6x9s you want on this amp. It's not going to be enough power to match speaker RMS power handling numbers, but you might be surprised.

Where do you plan to put 2 pairs of 6x9s and a pair of 3.5" coaxials? If you can't fit 6x9s up front I would do 1 pair of 6x9s and the 3.5" Polks on the front channels of the amp.

89Eldorado
01-17-2012, 07:00 PM
but will i make my speakers clipp and burn my tweeters? i dont want to damage my speakers...well im putting 1 pair of 6x9 on the doors 1 pair in the back, well thinks 2 pairs in the back and the 3.5 polk audio under my gear shift here is a pik not my car but the same interior http://i43.tinypic.com/9h6nfm.jpg

dragonrage
01-17-2012, 07:02 PM
Clipping is caused by you turning the gain up beyond what the amplifier can handle relative to the input signal. Nothing more, nothing less.

89Eldorado
01-17-2012, 07:04 PM
but will i make my speakers clipp and burn my tweeters? i dont want to damage my speakers...well im putting 1 pair of 6x9 on the doors 1 pair in the back, well thinks 2 pairs in the back and the 3.5 polk audio under my gear shift here is a pik not my car but the same interior [IMG]

89Eldorado
01-17-2012, 07:05 PM
so if i keep my gain down i will keep my speakers from gettin damaged right? my bad for the repost...i have burned the tweeters on both of my pair of 6x9 right now i have the memphis coaxil with passive crossover and a pair of pioneer

dragonrage
01-17-2012, 07:24 PM
If you set your gains correctly (and your equipment isn't faulty), your tweeters won't burn up.

89Eldorado
01-17-2012, 07:28 PM
would you recommend to overpower the speakers a bit with an amp that can push that much rms per channel? and would you recommend pioneers over kicker?

dragonrage
01-17-2012, 07:47 PM
I personally put them on the same level, but maybe others have something to add on that one. I do advise you to stick to 2-ways only. Avoid 3, 4, 5, 9000-ways like the plague.

89Eldorado
01-17-2012, 07:56 PM
why is that i was thinking of buying a 3way or 4way? and pioneer has a wider range of frequency

stocker08
01-18-2012, 03:08 AM
why is that i was thinking of buying a 3way or 4way? and pioneer has a wider range of frequency

3 and 4 way coaxs are mainly just overkill. In many ways, just a gimmick.

trumpet
01-18-2012, 11:52 AM
6x9s used to be incredibly popular. You could buy a pair of little sealed boxes and put an extra pair of 6x9s almost anywhere. Somehow along the way the market started seeing "supertweeters", which I believe might have been a Pioneer innovation. We ended up with monstrosities like 5-way 6x9s which have pods with a ridiculous total of 4 tweeters, each one smaller than the next. Manufacturers would put incredible power handling figures of 500+ Watts on these things.

Our hearing is most sensitive to treble, and there's no need to have more than one capable tweeter on a coaxial speaker. I used to run a 3-way or maybe 4-way 6x9 custom mounted in the rear of my first car, with 100W RMS on each one. That was a real ear-bleeding mistake.

Save your money and get one good pair of 2-way 6x9s. Stay away from WalMart's car audio department.

89Eldorado
01-18-2012, 03:40 PM
6x9s used to be incredibly popular. You could buy a pair of little sealed boxes and put an extra pair of 6x9s almost anywhere. Somehow along the way the market started seeing "supertweeters", which I believe might have been a Pioneer innovation. We ended up with monstrosities like 5-way 6x9s which have pods with a ridiculous total of 4 tweeters, each one smaller than the next. Manufacturers would put incredible power handling figures of 500+ Watts on these things.

Our hearing is most sensitive to treble, and there's no need to have more than one capable tweeter on a coaxial speaker. I used to run a 3-way or maybe 4-way 6x9 custom mounted in the rear of my first car, with 100W RMS on each one. That was a real ear-bleeding mistake.

Save your money and get one good pair of 2-way 6x9s. Stay away from WalMart's car audio department.

so you wouldn't recommend even 3way 6x9?...wouldn't they be heard from farther distances when im comin down the street?...i dont realy want to buy kickers tho im thinkin alpine or pioneer what do u think?

dragonrage
01-18-2012, 04:01 PM
Our speaker has:

A 6x9" woofer
A 1" midrange
A 0.9" tweeter
A 0.8" super tweeter
A 0.7" super super tweeter
A 0.6" super super tweeter


WHY?

All it does is block the sound from the woofer for NO BENEFIT and tons of added complexity. You need your drivers to actually differ in size and purpose to have any benefit. Add all that crap and the crossover needed for proper sound gets SUPER complex, but the crossover provided is always a POS. You need your crossover to actually take advantage of each driver in the speaker. These do not.

They are sold by marketing departments, not engineering departments. They are marketed towards those who think more is better.

89Eldorado
01-18-2012, 04:34 PM
but wouldnt a 3 way have mids low bass and high frequency?

dragonrage
01-18-2012, 04:37 PM
but wouldnt a 3 way have mids low bass and high frequency?

When your midrange and your tweeter are barely any different and your crossover is garbage, not only does it not make things better, it makes them worse.

duanebro
01-18-2012, 06:23 PM
A real three way does have low mid high. The speakers you are thinking of have a almost full range 6*9 plus several crappy tweeters. If you start with crap, adding more crap to it just makes a bigger pile of crap.

89Eldorado
01-18-2012, 10:35 PM
When your midrange and your tweeter are barely any different and your crossover is garbage, not only does it not make things better, it makes them worse

by any different u mean the size?

duanebro
01-18-2012, 10:46 PM
by any different u mean the size?

Basically, although it is not the size it is that they are all tweeters, they are covering the same frequency. This causes issues with the response. It doesn't help anything, it makes everything worse.

89Eldorado
01-18-2012, 11:11 PM
so i should go with 2way speakers then huh....and 1 more question im confused about on the mtx specs it says

25 watts x 2 into a 4 ohm
50 watts x 2 into a 2 ohm

how do you read that wouldnt it have to read
25 watts x 4 or
50 watts x 4

since 4 is the number of channels not 2 channel?

duanebro
01-18-2012, 11:23 PM
so i should go with 2way speakers then huh....and 1 more question im confused about on the mtx specs it says

25 watts x 2 into a 4 ohm
50 watts x 2 into a 2 ohm

how do you read that wouldnt it have to read
25 watts x 4 or
50 watts x 4

since 4 is the number of channels not 2 channel?

correct. If it is a 4 channel.

I don't know what speaker you are looking at but these are good, and a great price:
Aura 6900RPM 6" x 9" 2-way Coaxial Speaker Pair 269-185 (http://www.parts-express.com/pe/showdetl.cfm?Partnumber=269-185)

89Eldorado
01-18-2012, 11:28 PM
If it is a 4 channel.

thats what im asking why does it say 25 watts x 2 and not 25 watts x 4?

89Eldorado
01-18-2012, 11:30 PM
i got subs too so should i look for speakers higher in the high frequency range rather than in the low?

duanebro
01-18-2012, 11:31 PM
Can be an error in the manual. can you post a pic of the amp? make sure you can see the speaker connectors in the pic.

89Eldorado
01-18-2012, 11:46 PM
http://i40.tinypic.com/fnd6xx.jpg

i also found the same with this but i kinda get this since its just 2 channel

Rockford Fosgate Punch 400S 100W x 2 Car Amplifier at Crutchfield.com (http://www.crutchfield.com/S-CpBv0vLVZcM/p_575400S/Rockford-Fosgate-Punch-400S.html)

100 watts RMS x 2 at 4 ohms
200 watts RMS x 2 at 2 ohms
400 watts RMS x 1 at 4 ohms in bridged mode

it means its 100 watts each channel when both are in use at 4ohm and 200 watts each channel when both are in use and 400 bridge but how do i read the rms on meach channel on mine when all four channels are in used or 3 or 2?

trumpet
01-19-2012, 11:27 AM
thats what im asking why does it say 25 watts x 2 and not 25 watts x 4?

MTX decided to word it so it's F and R separately, even though they have the same power ratings. It's 25x2 @ 4 in the front and 25x2 @ 4 in the rear.

89Eldorado
01-19-2012, 02:21 PM
MTX decided to word it so it's F and R separately, even though they have the same power ratings. It's 25x2 @ 4 in the front and 25x2 @ 4 in the rear.

ok i get it now...1 more question how do i build a surface to place 4 6x9s on my back should i just lay the surface and mount the 6x9s or should i make like a type of box to house the 6x9s whould it make a difference in sound?

89Eldorado
01-19-2012, 02:37 PM
i guess what i mean is a baffel board