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Reply With QuotePicture of the sub:
Picture of the label. Hard to read by says "Dual 4ohm voice coil":
Both wired to the amp:
Back of amp. I never know what to set the xover freq to, but i play with it to no avail:
This statement is very contradictory. You're saying that the amp doesn't give you your desired results, and you think there might be something wrong with it, but it did give the desired results when paired up with a different set of subs. You just pointed to the subs being the most likely cause of the change and unsatisfactory performance.Originally Posted by Kurack
The numbers I posted above are not award wining. they're real world numbers for what you're calling "thump." Also of note is the fact that one higher efficiency sub would generate higher SPL's than the pair of these.
Also, after a bit of a closer look at the pictures, those numbers are a tad on the low side. Between 1.5 and 3dB SPL low. I didn't realize how close the subs were to your listening position.
Picture of the sub:
Picture of the label. Hard to read by says "Dual 4ohm voice coil":
Both wired to the amp:
Back of amp. I never know what to set the xover freq to, but i play with it to no avail:
ignore this post. I'm smoking crack today, I was looking at the diagram upside down
I guess I should have rephrased that. I'm getting barely any thump at all with these new ones. Everything wired the same as old ones (im goign to bring old one back out and rewire it to see). This is why i think the amp is the problem perhaps? I guess I am sayign that I dont understand or follow anything about dB...etc. Your numbers above mean next to nothing to me <sorry, they just dont>.
I guess to my original question a bit more....based on the amp I have that is powering these G5's....is it sufficient? My guess is no. If you had these subs, what amp would you be looking at to use with them <links to buy online would be cool>. The other amp i have for all the other speakers in the car (fosgate) is running good, no issues.
I appreciate all the help you guys are giving me....getting me closer to understanding and getting this fixed (if its an under powered amp)
It would be worth your time to do a bit of research on audio then. It can save you lots of money, and give you higher performing systems at the same time. (talking to a sales guy at best buy doesn't count. They're (mostly, not all) idiots and have no clue how things will really perform besides the big number posted on the box)
I'm not just being an *** btw. A well engineered system can cost less than half of a poorly designed system, and provide better results in less space, and it applies to everything from car audio to home theatre to PA to concert systems.
My question is how is that a "dual voice coil" sub with only one set of terminals on each sub? How do you wire it in parallel vs series if you only have one set of terminals?
Anything below the crossover frequency your subs will play, anything above it will be filtered out. You probably want that set between 80 and 105Hz.
And yes, in my opinion, if that amp is wired correctly it is "sufficient" but the subs will not sound as good sound quality wise as they could with a higher quality amp. Techy, as far as the numbers you posted, 108db should be more than enough for a little extra "thump" for the average person. A jet engine only measures +/- 120db...lol
And OP, check this out for some info on decibels http://www.howstuffworks.com/question124.htm
The fuses that are under the terminals are how it's a dual voice coil sub. When there are two fuses in it should be running the two 4 ohm VC's in parallel, making it 2 ohms. Even without the fuses, if internally the two VC's were in parallel or series it would still be a dual voice coil sub (assuming of course it had two).
With a mono amp he could set these up in Series and run at 4 ohms. No need for a 1 ohm stable amp.
They fail to mention that that jet engine measurement is at about 40'. At 1 foot it would be in the 150dB range. Also, the difference between 108 and 120 is MUCH larger than the difference between 85 and 97 since it's a logarithmic scale. Also, without distance being specified the numbers are worthless, since every time you double the distance from a point source you loose 6dB. It's a lot like trying to compare Horse Power and Torque between cars, but ignoring the drivetrain and weight of the vehicle. A lotus has a "small" engine, but is fast as snot cuz it's so light, vs. a mustang that has a much larger engine, but weighs a ton compared.
As well, because of the frequencies we're talking about higher SPL is required than in the mid range, since we don't hear in a linear fashion. This is represented by the equal loudness curve. At ~3,000hz if something is perceived as being 100dB SPL, then to duplicate that perceived SPL for 50Hz you would need an increase of ~20dB for them to sound the same "loudness"
I built my carpc system fully understanding what was needed (wires, amps...etc). I'm just not certain with the new subs.....
So pretty much I got from this thread to stick with the current amp and get it working right, it should be enough to give me thump. Dont upgrade, cause still I am not sure what a decent upgrade (a good amp is), no one has recommended any yet.
I'll figure it out then....thanks for the help guys.
IMO there is no need for an upgrade to the amp anyway. Best of luck and keep us posted.
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