Finally got metered.

[THXdts 10+ year member]

Well I finally got my base 15" BTL metered. It was off an AC. 15" base BTL off a Hifonics BXi2006d. I hit a 140.7 my first run and a 141.1 my second. Box is around 5 cubes at 33. I was pretty happy //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif.

Click to read more...

 

[krisfnbz 10+ year member]

thats pretty nice but I would expect more from a BTL with the way they are talked about, I have heard of a 15 inch L7 getting to 145DB

I have never got mine metered in 5 cubes but it would be interesting to see what im getting.

ANyways nice!

 

[squeak12 10+ year member]

I did a 154.1 on the AC when I had my "base" 12" BTL in my CRX. Not bragging, just putting it there for BTL results and comparisons.

 

[IgnoreMe 5,000+ posts]

what freq did you burp? dont know much about the hifonics but im pretty sure its not putting out as much juice as it should on a stock electrical (assuming) which might be the reason for the lower score.

you probably need to find the freq you peak at and work from there. that btl is probablly getting quite a bit less than 2k watts especially with box rise.

you cant expect the dude to hit 150db first try with a stock electrical and basically no testing before hand. my .02

 

[THXdts 10+ year member]

I did a 154.1 on the AC when I had my "base" 12" BTL in my CRX. Not bragging, just putting it there for BTL results and comparisons.

Ha that is awesome. Box specs?

what freq did you burp? dont know much about the hifonics but im pretty sure its not putting out as much juice as it should on a stock electrical (assuming) which might be the reason for the lower score.
you probably need to find the freq you peak at and work from there. that btl is probablly getting quite a bit less than 2k watts especially with box rise.

you cant expect the dude to hit 150db first try with a stock electrical and basically no testing before hand. my .02

I went from 35hz up to 50hz. Ya I have stock electricial.

 

[IgnoreMe 5,000+ posts]

whats the specs on the hifonics?

also you got a volt meter? if so hook it up to your battery on the DC voltage setting and face the dmm through your windsheild so you can see the reading. turn the car on and blast the test tones that you maxed out at in the comp and see what kind of voltage drops your getting. then let us know.

also if you have access to an ammeter it would be a good idea to map your impedance rise and also see how much power your sub is getting at your peak frequency

 

[squeak12 10+ year member]

It was about a cube and some change tuned in the low 60 range IIRC

 

[squeak12 10+ year member]

http://clashoftitans.net/web_show_pics_large/carrollton/16.png

A picture from the show

 

[THXdts 10+ year member]

whats the specs on the hifonics?
also you got a volt meter? if so hook it up to your battery on the DC voltage setting and face the dmm through your windsheild so you can see the reading. turn the car on and blast the test tones that you maxed out at in the comp and see what kind of voltage drops your getting. then let us know.

also if you have access to an ammeter it would be a good idea to map your impedance rise and also see how much power your sub is getting at your peak frequency

Specs I think are 2000 @ 1 ohm @ 14.4 volts..

Ya I can see what kinda voltage drop I am getting...I have a DMM that can messure current..so how can I do the impdeance rise thing?

http://clashoftitans.net/web_show_pics_large/carrollton/16.png
A picture from the show

Awesome, why did you get rid of it?

 

[skadude016 5,000+ posts]

psh Chris is quiet lolz

 

[squeak12 10+ year member]

I broke it. The glue joint at the surround and basket failed and tore the surround off about half way around. I think it was from improper loading due to the ports being diagonal and causing pressure in the corners.

 

[IgnoreMe 5,000+ posts]

Specs I think are 2000 @ 1 ohm @ 14.4 volts..
Ya I can see what kinda voltage drop I am getting...I have a DMM that can messure current..so how can I do the impdeance rise thing?

Awesome, why did you get rid of it?

well first use the dmm to give us an idea of how much voltage your dropping. your not going to be measuring current, but DC voltage actually. set it to the one that has a V with a straight or dotted line over the top, not the one that has a squigly line.

also 2k @ 14.4 ohms usually wont happen either. most likely you arent even at 14.4v with everything off //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif . im at ~14v sometimes 13.9 or so with everything off with my electrical. now add some voltage drops AND impedance rise and your sending WAY less than 2k to what is a known inefficient as hell 2k watt rms subwoofer. im willing to bet if you put that hifonics on a bl or a q you would get a higher score due to increased efficiency.

as far as impedance rise goes. use test tones in increments of 5hz or so from say 30-60hz. plug a dmm into the speaker terminals on the sub amp. then put an ammeter around the speaker wire running to your subwoofer. play a 30hz test tone at medium volume. write down the voltage and the amperage. multiply V x A to get wattage and divide V by A to get the resistance. so this way youll see at what frequency your getting X ohms and XXXX ammount of power.

 

[THXdts 10+ year member]

well first use the dmm to give us an idea of how much voltage your dropping. your not going to be measuring current, but DC voltage actually. set it to the one that has a V with a straight or dotted line over the top, not the one that has a squigly line.
also 2k @ 14.4 ohms usually wont happen either. most likely you arent even at 14.4v with everything off //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif . im at ~14v sometimes 13.9 or so with everything off with my electrical. now add some voltage drops AND impedance rise and your sending WAY less than 2k to what is a known inefficient as hell 2k watt rms subwoofer. im willing to bet if you put that hifonics on a bl or a q you would get a higher score due to increased efficiency.

as far as impedance rise goes. use test tones in increments of 5hz or so from say 30-60hz. plug a dmm into the speaker terminals on the sub amp. then put an ammeter around the speaker wire running to your subwoofer. play a 30hz test tone at medium volume. write down the voltage and the amperage. multiply V x A to get wattage and divide V by A to get the resistance. so this way youll see at what frequency your getting X ohms and XXXX ammount of power.

Starting voltage was 14.16..and with a test tone..the lowest was like 12.62...so...1.54 volts..

 

[THXdts 10+ year member]

I broke it. The glue joint at the surround and basket failed and tore the surround off about half way around. I think it was from improper loading due to the ports being diagonal and causing pressure in the corners.

Lol kinda funny actually.

 

[IgnoreMe 5,000+ posts]

Starting voltage was 14.16..and with a test tone..the lowest was like 12.62...so...1.54 volts..

ok, your your not off to too bad of a start. at least your not dropping to like 11v or some shit. next thing i would do is see if you can get your hands on an ammeter so that you can see what kinda impedance rise your getting.

btw what frequency was the one that dropped your voltage the lowest?