Do I need more amp or a higher preout voltage?

[snoopdan 5,000+ posts]

gotta remember that all a line driver is an amplifier - and thats it. And all amplifiers add a percentage of distortion into the situation.

I also think he's expecting too much. Sealed single sub applications are hard to get loud in the first place...being in a trunk is even worse.

But there is a silver lining of sorts, I say bridge the amp and use the 600 watts since sealed driver applications inheritly can take more power.

 

[MorningWood]

Im one of the people that's mentioned he's possibly expecting too much. Having it buried in a stubborn trunk could result in both situations imo (low output and hard to hear distortion), but he didn't have this issue with other sub systems in this trunk, aparently.
And I was just joking, calm down. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

I know youe were, this is not my first rodeo. I just thought I would throw my "me too" in since I have experinced the same thing with a low powered sub in a sealed box.

 

[grampi 10+ year member]

It's quite possible I'm expecting too much from one sub on 300 watts. I'm certainly open to the idea of picking up another amp to run my comps and bridging all 4 channels of the Kicker for 600 watts. Then I don't know if it would better to go with two 12's, or go with something like one 12W6. The 12W6 with that much power should have plenty of output, and the SQ should be excellent.

 

[MorningWood]

gotta remember that all a line driver is an amplifier - and thats it. And all amplifiers add a percentage of distortion into the situation.
I also think he's expecting too much. Sealed single sub applications are hard to get loud in the first place...being in a trunk is even worse.

But there is a silver lining of sorts, I say bridge the amp and use the 600 watts since sealed driver applications inheritly can take more power.

Good idea. At least then he will have a better idea which way he needs to go. are you familiar with that sub Snoop?

 

[audioholic 5,000+ posts]

I'm not unable to detect distortion, there isn't any to detect. I can hear distortion when it's present. You could at least try to respond without the smartassness. I'm surprised you had time to reply to this thread, being a full time ED basher and all.

Someone had a few too many prunes today. Calm down, Im trying to help.
Your h/u is capable of 4volts output. Your amplifier's input sensitivity is 340mv-10v high level, or 170mv-5v low lvl. You have your gains set to their max, either 170mv, or 340mv. Your h/u would surpass that threshhold almost immediately, given its 4v max output. Multiply that by your 18db bass boost and you expect me to believe you hear no distortion at all?

Smartassness? //content.invisioncic.com/y282845/emoticons/eyebrow.gif.fe2c18d8720fe8c7eaed347b21ea05a5.gif

 

[audioholic 5,000+ posts]

I know youe were, this is not my first rodeo. I just thought I would throw my "me too" in since I have experinced the same thing with a low powered sub in a sealed box.

Gotcha. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[grampi 10+ year member]

gotta remember that all a line driver is an amplifier - and thats it. And all amplifiers add a percentage of distortion into the situation.
I also think he's expecting too much. Sealed single sub applications are hard to get loud in the first place...being in a trunk is even worse.

But there is a silver lining of sorts, I say bridge the amp and use the 600 watts since sealed driver applications inheritly can take more power.

So you're saying I should put 600 watts to the e12k? Not possible. For one thing the driver has dual 2 ohm VC's and the minimum impedence for the amp to be bridged into is 4 ohms. Secondly, the sub is only rated for 300 watts. Running comps on doulbe their rated power is one thing, but running subs on that much...I don't know if I'd be comfortable with that.

 

[snoopdan 5,000+ posts]

Good idea. At least then he will have a better idea which way he needs to go. are you familiar with that sub Snoop?

no im not familiar with that ed sub, but I think he should at least try it considering it costs absolutely no additonal money to play with it.

IMO he should do one of two things......and maybe this is because im a SPL junkie, BUT...

1. Put 1000 watts on two 12" subs sealed, that way the enclosures are realtively small and still have alot of surface area to move some air. With the added bonus of having a sealed box alignment semi-flat natural response for more SQ than SPL (gasp //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif)

1. Put 1000 watts on one sub ported, with both the front surface area of the sub and the area of the port pushing air, he'll prob get the job done. The output will be peaky of course but who gives a shit, it will have a noticeable output difference than sealed.

just my opinion on it. Hell if he was local id say bring it over and we could tinker with it //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

amendment to post :

So you're saying I should put 600 watts to the e12k? Not possible. For one thing the driver has dual 2 ohm VC's and the minimum impedence for the amp to be bridged into is 4 ohms. Secondly, the sub is only rated for 300 watts. Running comps on doulbe their rated power is one thing, but running subs on that much...I don't know if I'd be comfortable with that.

Yes, do exaclty that.. Sealed will always take more power induced to it. Its a natural circumstance of it being in a sealed box alignment. Bridge the amp anyways and try the impedence load....the worst thing that can happen is that the amp goes into protect (as it should)....the best thing is that the impedence rise from the enclosure is so high that it wont matter anyways.

Try it!

 

[grampi 10+ year member]

Someone had a few too many prunes today. Calm down, Im trying to help.
Your h/u is capable of 4volts output. Your amplifier's input sensitivity is 340mv-10v high level, or 170mv-5v low lvl. You have your gains set to their max, either 170mv, or 340mv. Your h/u would surpass that threshhold almost immediately, given its 4v max output. Multiply that by your 18db bass boost and you expect me to believe you hear no distortion at all?

Smartassness? //content.invisioncic.com/y282845/emoticons/eyebrow.gif.fe2c18d8720fe8c7eaed347b21ea05a5.gif

You're welcome to come listen for yourself. I hear absolutely no distortion. The sub sounds clean.

 

[audioholic 5,000+ posts]

You're welcome to come listen for yourself. I hear absolutely no distortion. The sub sounds clean.

Then the amp is bad, or the h/u is outputting a bad signal to it. There's no way with those settings you shouldn't be hearing it. You have implied you have had other systems in this car before, have you run them all with max gain and bass boost settings?

 

[luvinthebass 5,000+ posts]

how much bass boost did you use 18 db's of it?

 

[luvinthebass 5,000+ posts]

Maybe he set the bass boost first then the gain.

 

[grampi 10+ year member]

Then the amp is bad, or the h/u is outputting a bad signal to it. There's no way with those settings you shouldn't be hearing it. You have implied you have had other systems in this car before, have you run them all with max gain and bass boost settings?

I've had parts of this system installed in another vehicle. I used the sub and the amp in a Tercel with a 7892 (which also had 4V @ 10K ohm preouts). In that vehicle I had the amp gain turned all the way up and the sub out level on the HU maxed out. The sub was also located in the trunk in that car, but it was installed in a 1 c.f. sealed enclosure. I'm not sure it had slighter more output because the Tercel's interior was a bit smaller, because it was in a smaller enclosure (the one it's in now is 1.25 c.f.), or a combination of the two.

 

[nauc 10+ year member]

that sub wont do what youre looking for, esp off 300 watts sealed. you should just barely be able to hear the bottom 2 octaves esp if you have pretty dam loud comps up front

thats no sql sub

 

[helotaxi 5,000+ posts]

I think he's looking for more of an SQ setup. I had a whole 400W on a XXX 12 in a trunk (given it was ported but at 28Hz) and it was really plenty loud for an SQ system. No need for 1kW on the subs.

FWIW a sealed box exerts less control over the cone than a port box played above tuning. Mechanical power handling is usually better ported.

I still think that there is something wrong with the setup.