1. ## Re: Does adding a 2nd speaker side by side add much volume?

Originally Posted by DDtC
Double cone area or double power on paper is a 3 db gain. It has show cone area gets closer to that mark. With that said if you double cone and not power it would equal out, you still could have a slight gain do to the cone but it might not be noticable. Double power and cone and it will have a big increase
Basic acoustic theory says both your posts on this matter are wrong.
Doubling cone area and cutting power in half to each speaker (same power overall) still gains you 3db. Watts and excursion don't correlate at a 1:1 ratio, halving wattage to each speaker doesnt' drop excursion by half, so when you double cone are you gain displacement/output. You also sometimes gain thermal advantages, which can gain you more.

Doubling cone area AND power gains you 6db which is a doubling of total displacementl and acoustic power. 10db of loudness is generally considered where the sound "sounds" twice as loud. With bass it's slightly lower due to the hearing. This corresponds to about 10x the power keeping cone area equal. If you quadruple power and cone are doubles, that also gets you close to this mark. IE 1 speaker on 100 watts becomes 2 sepakers on 200 watts each. For bass this doesn't work as well due to the box size needed often messes up your cabin gain, which is the biggest overall contributor to bass in a car, which is why alot of car audio guys dismiss these rules. For mids and highs though they work fairly well. So for OP, if your amp can't drop impedence and you end up using 1/2 the power on 2x the cone area, your still going to get the 25% sound increase your looking for, imagine if your volume knob had 2 or 3 turns of clean volume left..
Last edited by T3mpest; 07-05-2013 at 11:43 PM.

2. ## Re: Does adding a 2nd speaker side by side add much volume?

Originally Posted by T3mpest
Basic acoustic theory says both your posts on this matter are wrong.
Doubling cone area and cutting power in half to each speaker (same power overall) still gains you 3db. Input voltage and excursion don't correlate at a 1:1 ratio, halving voltage to each speaker doesnt' drop excursion by half, so when you double cone are you gain displacement/output. You also sometimes gain thermal advantages, which can gain you more.

Doubling cone area AND power gains you 6db which is a doubling of total displacementl and acoustic power. 10db of loudness is generally considered where the sound "sounds" twice as loud. With bass it's slightly lower due to the hearing. This corresponds to about 10x the power keeping cone area equal. If you quadruple power and cone are doubles, that also gets you close to this mark. IE 1 speaker on 100 watts becomes 2 sepakers on 200 watts each. For bass this doesn't work as well due to the box size needed often messes up your cabin gain, which is the biggest overall contributor to bass in a car, which is why alot of car audio guys dismiss these rules. For mids and highs though they work fairly well. So for OP, if your amp can't drop impedence and you end up using 1/2 the power on 2x the cone area, your still going to get the 25% sound increase your looking for, imagine if your volume knob had 2 or 3 turns of clean volume left..
Sorry you feel that way but I am not wrong.

3. ## Re: Does adding a 2nd speaker side by side add much volume?

Originally Posted by DDtC
Sorry you feel that way but I am not wrong.
LMAO care to google search to back youself up.. Nah, 100+ years of acoustic theory is useless next to the YOU! Maybe if you learned a bit about how speakers really work you wouldn't be stuck nuthugging brands so much.

4. ## Re: Does adding a 2nd speaker side by side add much volume?

We skipped the moat important question are the doors sealed and deadend

5. ## Re: Does adding a 2nd speaker side by side add much volume?

Originally Posted by T3mpest
LMAO care to google search to back youself up.. Nah, 100+ years of acoustic theory is useless next to the YOU! Maybe if you learned a bit about how speakers really work you wouldn't be stuck nuthugging brands so much.
I said doubling cone area OR power is a 3 db increase. If he cuts his power in half and doubles cone area it's the same thing. If everything is within parameters.

6. ## Re: Does adding a 2nd speaker side by side add much volume?

aha nvm then my apologies, i misunderstood your point. I was thinking you meant splitting the total power in half, not literally only having half..

7. ## Re: Does adding a 2nd speaker side by side add much volume?

Originally Posted by T3mpest
aha nvm then my apologies, i misunderstood your point. I was thinking you meant splitting the total power in half, not literally only having half..
It's all good.

8. ## Re: Does adding a 2nd speaker side by side add much volume?

Originally Posted by dumple
We skipped the moat important question are the doors sealed and deadend
Yeah about 1 yard in each door.

Went buy a couple of shops today to see about cost of building the door panels for Two 6.5s. it would be tricky because the lay out. So they were talking pretty big bucks.

Went to check on the Hertz 165 XL at a dealer, one of the guys show me 3 boxes of failed Hertz speakers! Yeks. Only a few of them where high energy's but still. needless to say he was not to jazzed about them.

Against some good advice i went ahead and ordered the RF T5652-s. The price was even lower than before, and the warranty is solid, so im going out on a limb. I haven't seen where anyone (non invested in RF) has actually tried the T5652-s, so maybe that particular model will be as good was some of the sponsored guys say they are.

T3mpest thanks for the info.

9. ## Re: Does adding a 2nd speaker side by side add much volume?

What headunit are you running active with

10. ## Re: Does adding a 2nd speaker side by side add much volume?

Originally Posted by dumple
What headunit are you running active with
DEH 80PRS.
Im going to get some one to tune it next week (i'm sure someone who really knows what there doing will get the sound to its max potential.

11. ## Re: Does adding a 2nd speaker side by side add much volume?

The Rockford Fosgate T5652-S work out GREAT!!!!

Put them in, and tuned them up, and not only gave me the extra good clean Volume i wanted, but they Totally Rocked My World! Absolutely Amazing!

No need for second speakers

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