Cabs out if phase???

bassix67 · #1 03-31-2011, 12:00 PM

I have my two 4ohm acme b2's going into a Ashdown LG1000 which is a dual mono head. Problem is when I single each can the bass is way more pronounced but when I have them both plugged the bass drops a bunch. I've done the 9v test on all speakers and they all push out.

Any thoughts???

anonymous02282011 · #2 03-31-2011, 12:02 PM

1. Congrats on the new iPhone

2. Call Andy at Acme. He'll straighten out the cab problem.

bassix67 · #3 03-31-2011, 12:23 PM

Love the iPhone app!!!

AwkwardLoudness · #4 03-31-2011, 01:23 PM

Are you stacking the B2 cabs vertically? If not, then try that.

What's the minimum impedance of that Ashdown amp? 2Ω? Each side of the "dual" mono is 4Ω minimum?

bassix67 · #5 03-31-2011, 01:36 PM

Quote:

Originally Posted by AwkwardLoudness

Are you stacking the B2 cabs vertically? If not, then try that.

What's the minimum impedance of that Ashdown amp? 2?? Each side of the "dual" mono is 4? minimum?

4ohm min each side. Doesn't matter how I stack um there still they're still outta phase. I daisy chained them for a test and they're in phase. I changed cables and did the 9v test and talked to Andy. Should I just reverse polarity in one of the cabs?

lunarpollen · #6 03-31-2011, 01:45 PM

Well, reversing polarity is quick and easy to do, and it will instantly tell you if phase is the culprit...

anonymous02282011 · #7 03-31-2011, 01:47 PM

Quote:

Originally Posted by lunarpollen

Well, reversing polarity is quick and easy to do, and it will instantly tell you if phase is the culprit...

or if you can solder take apart a speaker cable and wire it out of phase.

bassix67 · #8 03-31-2011, 01:47 PM

Quote:

Originally Posted by lunarpollen

Well, reversing polarity is quick and easy to do, and it will instantly tell you if phase is the culprit...

So reverse at the crossover or at the speakers? And if it is the culprit, where do I go from there?

anonymous02282011 · #9 03-31-2011, 01:51 PM

Quote:

Originally Posted by bassix67

So reverse at the crossover or at the speakers? And if it is the culprit, where do I go from there?

this is why i think re-wiring a speaker cable might be a bit easier.

and I mean the cable that connects the amp to the speaker

greenboy · #10 03-31-2011, 01:56 PM

Whatever you do, mark it with a tape label or something. Years later one is always scratching their head going, "hmm, what's going on here".

I usually keep every item capable of being used with any other item that is correct in polarity.

bassix67 · #11 03-31-2011, 02:40 PM

Quote:

Originally Posted by adbass

this is why i think re-wiring a speaker cable might be a bit easier.

and I mean the cable that connects the amp to the speaker

Is there a reverse polarity cable??? Or am I missing something.

Sorry I read it wrong thought u said re-wire speaker cab. I don't know how to rewire for polarity.

greenboy · #12 03-31-2011, 02:43 PM

Sometimes cables get miswired to connectors and that will cause problems. Always make sure they are phase-correct.

BassmanPaul · #13 03-31-2011, 02:53 PM

If the amp is a dual mono amp see if the amp has a bridge switch. If it has one make sure it's not engaged. In bridge one amp will be out of phase with the other. As you have done the battery test we know it's not the cabinets.

AwkwardLoudness · #14 03-31-2011, 02:54 PM

Try using different amps and cables if you can.

billfitzmaurice · #15 03-31-2011, 02:56 PM

Quote:

Originally Posted by bassix67

Is there a reverse polarity cable??? I don't know how to rewire for polarity.

Reverse the leads on one end.

bassix67 · #16 03-31-2011, 03:21 PM

Quote:

Originally Posted by billfitzmaurice

Reverse the leads on one end.

At the crossover?

BassmanPaul · #17 03-31-2011, 03:26 PM

If you have a digital meter, and every musician should, check ALL of your speaker cables for continuity tip to tip and sleeve to sleeve with the meter set to low ohms Ω. If you have one that has sleeve to tip continuity that cable is faulty and should be fixed.