I was told by one previous street competitor that he used one for a whole season. Then another competitor told me he had to eat some restocking fees as he was told after purchasing the transformers that they were not allowed.

Also, be careful on which model you get and be sure to talk to Vertias/Stinger before you buy. Mine pair worked fine on my RF 75.2's (350 watts each), but did not like my Xtant X1001(1800 watts) even though they're rated at 1200 watts each (I had 2).

Or if you could talk wayne into responding to my email or pm it would be greatly appreciated.

Since wayne hasnt responded yet.

Thanks

quote:

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Originally posted by cbrman:
Thanks for the response BMF, I searched the rules and never found anything, but on the other topic i posted in general I got conflicting responses. One person said they were not allowed to compete in a dbdrag event with a accumatch impedance transformer, and ended up eating a 15-25% restocking fee. I am gonna buy the amp and try to make it work below the rated impedance if it doesnt work, well i will buy the transformer and show up to the show. If they try to dq me i am gonna be really pissed. I waited over a month for a response to my email and my pm.

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quote:

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Originally posted by cbrman:
Zapco 9.0 what's that?

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Hence my question if the accumatch transformers were allowed in street. I was told the zapco's will not come on with a load less than 2 ohms. Guess i will have to work with the enclosure tuning to get the desired impedance.

steven

quote:

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Originally posted by cbrman:
Yes i am kidding dude. I have a zapco 9.0 shipping to my house as we speak. Hence the after what is a zapco 9.0xd. I am going to try and run a zapco 9.0xd- 4 ohm model at ~1.4 ohms for burps. I am hoping i can get an inside enclosure impedance between 2-4 ohms. If not, i was gonna get one accumatch (hi power from bigwoofer) and run the amp at 2.8ohms.

Hence my question if the accumatch transformers were allowed in street. I was told the zapco's will not come on with a load less than 2 ohms. Guess i will have to work with the enclosure tuning to get the desired impedance.

steven

Oh yeah, I got a response from a 2x judge and he said he didnt see a problem with using the accumatch in case anyone was interested in the original post about my topic.

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You may really want to try a 2 ohm 9.0 instead, my box went from 1.66ohms(dcr) to 3.8ohms(reactive) only because it was very large, the L7s have fairly high inductance voice coils, and it was tuned to do so.

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I just went back and re-read your earlier posts, and it sounds like you have 2 1.4 ohm 12s, if that's the case, then you will want to put them in series to that 2.8 ohm load you were referring to earlier, but you might still have to 'roll it up'.

[ 12-20-2001: Message edited by: Q ]

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"I'm feeling very humble lately, but I'm sure I have the strength of character to fight it"
-Bob Hope

"Only YOU can prevent AMPLIFIRES!"
-jarfunkz


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Q
Senior Member
Original Member # 740

Posts: 1934 | From: Somewhere Out Mountainbiking The Sierra Nevada | Registered: Nov 2001  |  IP: Logged | 

quote:

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Originally posted by Q:
You ordered a 4 ohm 9.0 for a 1.4 ohm load?
I think I would have tried a 2 ohm version first, but if it's gonna work at all, you will have to 'roll it up' with the volume control.
Start with a low (125dB) volume setting, and when the burp starts, roll up the volume.

You may really want to try a 2 ohm 9.0 instead, my box went from 1.66ohms(dcr) to 3.8ohms(reactive) only because it was very large, the L7s have fairly high inductance voice coils, and it was tuned to do so.

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I just went back and re-read your earlier posts, and it sounds like you have 2 1.4 ohm 12s, if that's the case, then you will want to put them in series to that 2.8 ohm load you were referring to earlier, but you might still have to 'roll it up'.

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[ 12-02-2001: Message edited by: Q ]

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Guys I have 2- dual 1.4ohm DD9012's.

That is 4 - 1.4 ohm coils.

These are my options to run the amp mono:
If i run them series I will get (1.4 X4)= 5.6ohms dcr
If i run them parallel i will get (1.4/4)= 0.35ohms dcr,
If i wire them series parallel, I will get (1.4 +1.4) /2= 1.4 ohms dcr.

My options to run the amp stereo:
1.4 +1.4 = 2.8 ohm stereo
1.4/2=0.7 ohms stereo
Or stereo with 2 accumatch transformers 1.4 ohms dcr

Or if i run them all in series, get a high power accumatch transformer i can run them with a 2x step down transformer at 5.6/2= 2.8ohms dcr, hence my original question. I was hoping to run the amp at 2.8 ohm dcr with an impedance rise close to the 4ohm rating on the amp.

The reason i didnt get the 2 ohm model is becuase i didnt have $2k+ for it like my local shop wanted. I got a great deal on a 4 ohm model and that is why i wanted to make it work, possibly with the addition of an accumatch.

Other people have said to have my dd 9012's reconed to a higher impedance. Well I just bought them, they have never been played not once. I cant merit spending another 300 bucks to upgrade them (90 each for upgrade, 30 each for sub shipping to dd, 30 each for shipping back to me)

Any other suggestions?

Thanks
Steven

quote:

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Originally posted by Q:
So now you've got me wondering how much Zapco would charge, and even if they might change it to a 2 ohm version...?
I can't believe it would cost more than an Accumatch, which MUST use/waste power to operate.

Anyone have any claimed efficiency rating for the Accumatch, and do they make any xfrmrs able to handle 2K-2.5K without saturating?

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Check the for sale section...There is someone selling the accumatch's for REALLY cheap! !!!

I got the 9.0 for 850, and would gladly pay to have it upgraded at zapco, but they told me to get my subs upgraded to dual 2ohms when i emailed them. Like I said earlier, those are brand new, and it would cost 300 bucks, or i could get an amp change for ? Or i could get the accumatch for alot less than 300.

Q, how big of a box did you have to use to get your l7's from 1.66 dcr to ~4ohms at burp freq? I was going to do about 3.5ft^3 per sub after sub/port displacement. Do you think i could get the dd's up to that impedance? Damnit, now i am wishing i saved 450 and bought the d2. I know the zapco is a better amp, but $hit, I am told "no prob running it that way" then after buying it i am told i will fry it.

This sucks

That is what i wanted to know was how to get the impedance to rise appropriately. I know what to do know.

As for the accumatch's. The original for sale post said they were special high power application ones capable of 4kw. now it says 1200rms 4kw peak. I am assuming they are the standard ones, but who knows. I don't think i will use the zapco as a daily driver, as i can't probably provide the proper amount of power to it. Dont want to smoke it also

Your best option: Find someone in your area good at reconing and have the subs changed to dual 2's. This could be as low as $150 up to $300

Your second option: Send the amp to Zapco, have them change it to a 2 ohm version (requires resetting factory settings, rail voltage, preotection levels, etc). Not sure on *your* price.

Not a good option: accumatches!

quote:

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Inc.President, Sweet Sounds, Inc.

We've won it all and
We've lost it all
We've held it before and
We've lost it afterwards
We've built it from the ground up and
We've burned it from the top down
We've competed on a fair level and
We've been screwed
We've brought game and
We've lost game

And that's just the last two years

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Now that's a mouthfull, and so true...!