Final Choices

The rockfords.......NO, they would take 3 times as much power to get as loud as the Infinities in the same type of enclosure! Yes, REALLY.......

 

Type X...friend has two of them...on two mrd-1001's REAL clean...

I like how people are stealing my layout of asking "final" sh!t

 

Arent alpine subs very power hungry?

 

If thats the case, then they suck for sensitivity. any sub that does less than 90 dB at 2.83 volts drive can go jump in a fireplace, the heating BTU's are surely more efficent than the SPL output!

 

A lot of subs are less sensitive than that Viking...

 

Then I say BURN them ALL!!!!!! Muhahahahahahahahhahaahah!!!!!!!!!!!!!!!!!!!!

 

fina; was bothering me its fixed now though

 

Just want to say smoething about speaker sensitivity, or efficiency for another slightly different term. anyway, One key aspect to the production of sound, from SPL systems to SQ systems, is the sensitivity.

Now, believe it or not, for those not in the know, a speaker that is 3 dB more sensitive than another, its like DOUBLING your amplifier power! Yes, it IS true.

Lets put this into perspective here. Joe blow is running one 12 woofer with a 1kW amp in a sealed box. the sub does 90 dB at 1 watt drive. It will do 120 dB. Period, end of story.

John buttblanger has a 12 woofer in the same box that is driven by the same amp. Only HIS 12 incher is 95 dB efficeint. Guess what???? It will do 125 dB!!!!!

Ah yes, the wonders of logarithmic math and fancy shyte like that!


What this translates into is better dynamic range, less load on your amp and electrical system, and lst but not least (and most important to many) a system that gets louder! YAY!!!!!


Class dismissed.........I need a beer, and a hot college chick to have an affair with......

 

Check out the Polk SR 124 subs. At my local Stereo shop earlier today and a guy had 2 of these being pushed by a Eclipse DA7122 amp at 2 ohms. Was running a 4 channel Eclipse amp for MB Quarts for the front and rears. it was in a Ford Expedition, wow the bass was amazing, tight, clean, low and no distortion and very very loud. Nice subs. Ive owned the Kappa perfects before and have listened to the type X and I beleive the Polks are better sounding subs. check them out before you buy the others.

 

Joe blow and John buttblanger.....heh

 

While I agree with everything you said, I do have a question.
First, the sub I use, the Polk DX-10 has a very low sensitivity. But thats because sensitivity is measured at 1W/1M at 1000hz. The frequency responce for my woofer is from 20-400Hz.

So is sensitivity really a good measure for a woofer?
Do I really care how effecient it is at 1000 Hz?

I am asking because I use the same explination with my customers.

 

John Buttblanger just got owned


And I also think it is very very GAY for manufacturers to measure the subs sensitivity at 1000Hz...who the fuk is gonna play a 1000Hz note from a SUBWOOFER!!!

GAY GAY GAY!!

 

I think I said something to the effect of "who cars about 1KHz efficiendy for a sub somewhere, i think?

Anyway, No, that does not matter, what does matter is the 100Hz and below.

If a woofer is measured PROPERLY, say white noise on an Infinite baffel, anechoic chamber, the reading will be proper, now, do they filter the sound for just sub bass? NOT SURE!!!! But I find it reasonable to believe that the greatest SPL at reference drive voltage will be achieved at the lower registers due to the actual pressurization of the room. And lerts face it, most subs have 2" or larger voice coils which means that upper freq. response is not good, and the fact thtthe Moving mass of the woofer is so high that it cannot accuratly or efficiently produce midrange or upper register sounds .



I can also atest to the fact of this....


I have swaped out woofers more sensitive for less sensitive ones. All things being equall, and a accurate blast mic, the results showed that their was difference, and within 1 dB of my calculations..........(the woofers were not even broke in yet)


Hope that helps answer your question

 

Actually that does make sense, thank you

 

I said "white noise" WTF


meant girly "pink" noise, much sexier!

 

Sensitivity specs are not reliable info

Not trying to split hairs here, but I would suggest you not pay much attention to any factory sensitivity specifications.
The range of real-world difference, in terms of the traditional 1w/1m of most car audio subs these days is 2 - 3 dB tops, and few 10's or 12's can
manage over 90 dB in a 10 or 12 (but then 15's or 18's are another matter).

Infinity is notorious for exaggerated numbers on this spec, just like other brands print bogus specs on power and/or power handling. I would bet
that Rockfords spec is close to accurate, but no way there is that kind of delta between those two subs.

But I would agree the RF is less efficient. Generally the larger the VC, the higher the long-term thermal power handling, so the higher the moving
mass, so the less efficient it will be (but it may well still play signifcantly "louder" given adequate power et all).

That's my .02 on this.

Good luck with your system.

Rick

 

im not trying to split hairs here either................. but this is a 3 year old dead thread.:huh: