Need some help choosing a Sub and Amp all audio fanatics, come in!!!
03-23-10, 11:28 AM
#31
those JL's are going to be quiet, 89db efficiency with 60w handling...... that really sucks!
89db - 1w
92db - 2w
95db - 4w
98db - 8w
101db - 16w
104db - 32w
107db - 64w
Of course the efficiency also changes with the enclosure, but that being said usually when any reputable speakers manufacturer tests sensitivity they will place the driver in the recommended enclosure before rating it at 1W/1M
89db - 1w
92db - 2w
95db - 4w
98db - 8w
101db - 16w
104db - 32w
107db - 64w
Of course the efficiency also changes with the enclosure, but that being said usually when any reputable speakers manufacturer tests sensitivity they will place the driver in the recommended enclosure before rating it at 1W/1M
Okay you really lost me on that one
first where did you get the 89db from?
and are you saying I need 107 db to get the amount of power the speakers are capable of?
I need a bit more clarification on this...
and Im not looking to spend too much more on the system now, just the amps as I already have the JL speakers, ordered the Diamond audio amp and solobaric L5 already, so only thing left is the 4 channel amp
03-23-10, 04:01 PM
#34
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When you double the input power, you can see a net increase of 3dB (in a perfect world). This is NOT a doubling of the SPL output. It takes a 10dB step to get twice as loud. 80dB = half as loud as 90dB. Decibels are logarithmic, they are not linear. It takes 10 times the power to get twice as loud, as I said before.
89dB is plenty loud. If you are running 60 watts through them, you will be more than happy. I didn't see the model of the Kicker before, but that does seem like a decent unit. I second the JL option that tneig said.
Big Mack
03-23-10, 04:39 PM
#35
Absolutely incorrect.
When you double the input power, you can see a net increase of 3dB (in a perfect world). This is NOT a doubling of the SPL output. It takes a 10dB step to get twice as loud. 80dB = half as loud as 90dB. Decibels are logarithmic, they are not linear. It takes 10 times the power to get twice as loud, as I said before.
89dB is plenty loud. If you are running 60 watts through them, you will be more than happy. I didn't see the model of the Kicker before, but that does seem like a decent unit. I second the JL option that tneig said.
Big Mack
When you double the input power, you can see a net increase of 3dB (in a perfect world). This is NOT a doubling of the SPL output. It takes a 10dB step to get twice as loud. 80dB = half as loud as 90dB. Decibels are logarithmic, they are not linear. It takes 10 times the power to get twice as loud, as I said before.
89dB is plenty loud. If you are running 60 watts through them, you will be more than happy. I didn't see the model of the Kicker before, but that does seem like a decent unit. I second the JL option that tneig said.
Big Mack
10dB linear, 3dB logarithmic
by definition approximately 3 decibels equals twice the power or output
3dB is twice the acoustic output, 10dB is twice as loud to your ear
03-23-10, 07:17 PM
#37
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Decibel information
"A change in power ratio by a factor of 10 is a 10 dB change. A change in power ratio by a factor of two is approximately a 3 dB change."
Also here is the same thing I've been saying.
"As the table illustrates, an increase of 3 dB represents a doubling of power. The reverse is also true. If a signal decreases by 3 dB, half of the power is lost. For example, a 1,000-watt signal decreased by 3 dB will equal 500 watts, while a 1,000-watt signal increased by 3 dB will equal 2,000 watts."
"When you speak of the dB level of a signal, you are actually speaking of the logarithmic comparison between the input and output signals."
No matter how you slice it, the JL's will sing on 60 watts. You would need to run them beyond their thermal limits to raise them up high enough to be twice as loud from that point, but as Bippu pointed out, you'll be able to hit 107dB quite handily (and reliably).
Big Mack
03-24-10, 06:49 PM
#44
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I didn't read thru the whole thread but when you were looking into crunch amp, I knew right away someone was going to flame you.
Crunch = swap meet brand.
there are tons of better low quality amps out there, just gotta do your research.
If it was my choice, I would stick a infinity kappa perfect (which sounds amazing even in small spaces 98db sensitivity and less than 1.0cubic sqft required), a reputable amp for your speakers, and a separate amp for your sub.
Stay away from
almani (not armani)
performance technique (you can get away with using it but there are better ones)
crunch (aka crunch usa)
DHD (ok but not really great)
memphis (cheap but some peopel swear by it)
audio planet
ultimate
boss
volfengheisn or osmething like that
audiobahn
hifonics
alpha sonic
koiler
etc.
It is always better to overdo your amp and turn it down than underpowering it and buying another amp down the road.
Crunch = swap meet brand.
there are tons of better low quality amps out there, just gotta do your research.
If it was my choice, I would stick a infinity kappa perfect (which sounds amazing even in small spaces 98db sensitivity and less than 1.0cubic sqft required), a reputable amp for your speakers, and a separate amp for your sub.
Stay away from
almani (not armani)
performance technique (you can get away with using it but there are better ones)
crunch (aka crunch usa)
DHD (ok but not really great)
memphis (cheap but some peopel swear by it)
audio planet
ultimate
boss
volfengheisn or osmething like that
audiobahn
hifonics
alpha sonic
koiler
etc.
It is always better to overdo your amp and turn it down than underpowering it and buying another amp down the road.
03-24-10, 08:17 PM
#45
I was kinda hesitant on the crunch but I WAS thinking that it would be a good brand that isnt the most mainstream (example Diamond Audio) I was just waiting for an enthusiast to come in and inform me if it was good or not before I pulled the trigger.
and wait... for a 60 RMS set of speakers, I should power it with an amp with more than 2x the power? WOW what would be the benefit of that?
and wait... for a 60 RMS set of speakers, I should power it with an amp with more than 2x the power? WOW what would be the benefit of that?