Saz3000 and impedence rise

[fritosaregood 0]

I have had single audiopulse axis dual 2 ohm sub wired to my sundown 3000 at 1 ohm. I was going to get a second sundown for my second axis. but recently testing the power and impedence rise charts with my wt3 woofer tester, i found that my impedence rise is going up to 3 with the single axis. so ive only gotten about 2000watts with lots of clipping. After i noticed that i put both axis's in a sealed box with them wired down to .5 ohms. i clamped it today and took an impedence curve and its raising to about 1.1 ohms now. i got about 2300 watts before my voltage dropped too low where i didnt want go continue, and no one was here to rev the engine.

So this brings my question. Should i just wire them to .5 ohms on one amp. or strap two amps together with a two ohm load?

is there a way to keep my impedence rise lower?

also will the whole amp get hot when it heats up? after driving home from class about 25 mins, the side of the amp where the rcas plug in was hot. It was sunny out today finally so it may be that the sun was shining through my back seat and just hitting the amp in that spot. it was sittin in a parkin lot for about 4 hours.

[hiloracerboy84 0]

i assume those numbers were taken on a tone? if you're doing spl, then max efficiency is key, then you can mess around with impedence and rise and all of that in a given enclosure at a given freq. if its daily, impedence will fluctuate all over the place so its not really important imo. i could be wrong though

[cubdenno 0]

Using a clamp meter and a Dmm, I found that with my subwoofer wired for a dcr of 1 ohm had an impedance rise to no lower than 3 ohms. This was checked at 20 hertz to 100 at 5 hertz intervals. I have the TC3000 15 DVC.

Different box styles have a slight change I have found on rise but mostly it is not that drastic a change to warrant. I would get a ported enclosure for those Axis subs. Make sure you have the electrical reserves to power that 3000 and wire it for DCR of .5 ohms. The rise will keep you above 1 ohm. The power increase in the amp should be noticed especially with the two subs playing.

My reasoning behind this advice is that the money you put into buying another 3000 would be wasted because it sounds like your electrical is maybe a bit weak for the single 3000. Granted I do not know what you have, such a feeling after reading your post. spend that 600 or so dollars on more batteries and/or an alternator and get those subs dancing!

[Duran 387]

You cannot supply your single 3KD with enough current and you want to put another on the second electrical? I think not.

[fritosaregood 0]

You cannot supply your single 3KD with enough current and you want to put another on the second electrical? I think not.

I have enough, it was dropping to 12.5 and i just wanted to test at a higher voltage.

[fritosaregood 0]

i assume those numbers were taken on a tone? if you're doing spl, then max efficiency is key, then you can mess around with impedence and rise and all of that in a given enclosure at a given freq. if its daily, impedence will fluctuate all over the place so its not really important imo. i could be wrong though

it was done on a 55 hz tone, but i have a WT3 woofer tester and my impedecne for a single axis at 1 ohm raised to 3 almost the hole time with a jump to 8 or 10 at 40 hz

[fritosaregood 0]

Using a clamp meter and a Dmm, I found that with my subwoofer wired for a dcr of 1 ohm had an impedance rise to no lower than 3 ohms. This was checked at 20 hertz to 100 at 5 hertz intervals. I have the TC3000 15 DVC.

Different box styles have a slight change I have found on rise but mostly it is not that drastic a change to warrant. I would get a ported enclosure for those Axis subs. Make sure you have the electrical reserves to power that 3000 and wire it for DCR of .5 ohms. The rise will keep you above 1 ohm. The power increase in the amp should be noticed especially with the two subs playing.

My reasoning behind this advice is that the money you put into buying another 3000 would be wasted because it sounds like your electrical is maybe a bit weak for the single 3000. Granted I do not know what you have, such a feeling after reading your post. spend that 600 or so dollars on more batteries and/or an alternator and get those subs dancing!

my single sub sayed above 3 most of the time too. Ive got a single ported enclosure for them, but wanted to try sealed for a bit. ill be going with both ported this summer. its just hard to fit it in my trunk. the minimal sealed enclosure is at tight fit already.

And ive got the electrical back up, 200 amp alt and 2 kinetik1800s, and 2 2400s in my garage waitin for the second amp.

I really wanted to get 6000rms from my next setup. but it looks like i need dual 1 ohm subs for it to happen.

[cubdenno 0]

Unless you are going to compete and you need to squeeze every .db out of you set up, wiring to get the lowest dcr on those amps is not going to net you the gain in volume that warrants that much investment. doubling power gets you a theoretical 3db of output. doubling speakers gets you the same theoretical 3db on the same power. So theoretically doubling both power and speakers gets you a 6 db increase. If you run both subs and two amps you should see a 4-5 db increase in what you are currently getting. thats without taking into consideration any cancellation loss phasing issues etc that can creep up.

Hell, what sized/tuned frequency box do you have? I ran mine in a under 2 cubed sealed enclosure for a while.

I guess what I am saying is that if 2 amps on two subs is your dream then do it. But worrying about what the amp is putting out and trying to maximize that output is useless for a daily driver as the gain in power is not going to get you the extra increase in output that is that noticeable.

Edited April 2, 2009 by cubdenno

[fritosaregood 0]

Unless you are going to compete and you need to squeeze every .db out of you set up, wiring to get the lowest dcr on those amps is not going to net you the gain in volume that warrants that much investment. doubling power gets you a theoretical 3db of output. doubling speakers gets you the same theoretical 3db on the same power. So theoretically doubling both power and speakers gets you a 6 db increase. If you run both subs and two amps you should see a 4-5 db increase in what you are currently getting. thats without taking into consideration any cancellation loss phasing issues etc that can creep up.

Hell, what sized/tuned frequency box do you have? I ran mine in a under 2 cubed sealed enclosure for a while.

I guess what I am saying is that if 2 amps on two subs is your dream then do it. But worrying about what the amp is putting out and trying to maximize that output is useless for a daily driver as the gain in power is not going to get you the extra increase in output that is that noticeable.

its just that how i see it ill only be gettin 3000rms either way. with both on one amp with impedence rise to 1.1 i get 3k. but with 2 amps strapped and a 2 ohm load with rise around 6 ,i can remember exactly what my rise was, id still be at 3k. Will this really happen?

right now i have a 4 cube internal with dual chambers sealed enclosure. before was a 2 cube ported box with a looooong port. tuned to 22hz

[cubdenno 0]

Oh haysoos christoff... That tuning frequency is way low. most music only goes to around 30 hertz. Unless you are doing movies in your car or bring that box into the house i would tune higher.

I understand what you are saying. All I am saying is that the actual gain in this path to getting all the output possible is not worth the added expense. Running strapped or just as two mono amps you will get more power than one amp on two subs. It will be louder.

Sent a PM

[fritosaregood 0]

Oh haysoos christoff... That tuning frequency is way low. most music only goes to around 30 hertz. Unless you are doing movies in your car or bring that box into the house i would tune higher.

I understand what you are saying. All I am saying is that the actual gain in this path to getting all the output possible is not worth the added expense. Running strapped or just as two mono amps you will get more power than one amp on two subs. It will be louder.

Sent a PM

the box tuning was accidental, but i love this box. half the time i just play bass stuff anyway and it does great on lows. for the 2 ported boxes ill be tunin at 30~33

I have to 22hz box in my room now for the HT

[cubdenno 0]

I bet it shakes your place. I used mine in a 6 cube box tuned to 25 hertz with a Behringer EP2500 amp and it was ridiculous in my house.

I have run mine in several boxes. I am currently building a horn loaded enclosure to try out. I am running a 3.5 cubic foot tuned to 40 hertz and it is quite loud as in mid 140's. I have a bandpass that is a bit louder but wanted to try this design I am running right now. It stretches in car to the mid 20's. My son loves it with rap but I listen to rock and I always leave my car with a goofy grin.

[fritosaregood 0]

I bet it shakes your place. I used mine in a 6 cube box tuned to 25 hertz with a Behringer EP2500 amp and it was ridiculous in my house.

I have run mine in several boxes. I am currently building a horn loaded enclosure to try out. I am running a 3.5 cubic foot tuned to 40 hertz and it is quite loud as in mid 140's. I have a bandpass that is a bit louder but wanted to try this design I am running right now. It stretches in car to the mid 20's. My son loves it with rap but I listen to rock and I always leave my car with a goofy grin.

i did have the box with the axis in it on a bash 500 amp and it shook everything, right now i have a dayton hf 15 in it.

I want to try a horn loaded, but can get the design part down. The box i have now was my thought of how a tapped horn box was, but it didnt taper down. The port exits across the sub

[chad y 1]

I have my TC 3k in a 3.1 ft^3 tuned to 32hz and it plays every note with great SQ and gets stupid loud. I have been thinking about getting another one. I am just not sure if I want to do that or a other single sub set up.

Thanks for your testing, was a very interesting read. It sums up what I had thought with out having the time to test.

Chad