Acme B2 and LG1000 problem

[bassix67]

Just got a Acme B2 series 2 to go along with a series 1 B2 both 4ohm. Plugged them into my LG1000 (500w x 2 @ 4 ohms). All should be good right? Not!! My
Series 1 started farting when I hit the lows.
Both cabs sound great when singled, no farting at all. Put a meter on the cabs and both check in at around 4ohms. HELP!!!!

[mntngrown]

you would think if one side of the amp is bad it would happen to the other cab (series II) when you swap the speaker cables to the two cabs. Then you know it's either the cable or one side of the amp.
so to clarify leave em plugged in the same on the head but switch em on the cabs.

[bassix67]

Did that!!! Doesn't matter what channel the series one is in it's farting but only when running both cabs.

[ahsbass6]

If the amp checks out call ACME, they are good about answering your questions. Could be the cabinets are out of phase .( Possibly the old vs new electronics or crossover) Use high quality speaker cable, preferably both the same. (forgive me for stating the obvious) I have an original B-2, it eats tons of power. I use a SWR Goliath 4 ohm when I need the 4x10 "sound".

I have never been happy with the slap sound of the B-2.. the tweeter is too small but for other applications such as playing musical theatre or some jazz gigs you can't beat the low end smoothness and defenition of the B-2.

[ahsbass6]

Forgive my spelling errors! Ha!

[bassix67]

I was thinking about the crossover myself "old vs new". I'm calling Ashdown tomorrow.
To get the tweeter to come alive you've gotta EQ the cab. It will speak. I come outta the R&B/fusion realm and I live for the snap of a tweeter.

[ahsbass6]

I have changed the setting of the tweeter, still not crazy about the sound. I have a Yamaha Nathan East Signature 5 and Yamaha TRBJP2 both sound great slapping. The Goliath gets the sound I expect from both basses.

[bassix67]

I felt the same way but read somewhere that if you plug a CD or IPod thru ur head for playback you'll hear the tweeter come alive. Did that and vwala!!. I pulled out my old DOD EQ stomp box and there it was.
It's not as crispy as an SWR but with the mid speaker and the tweeter!!! umm umm umm. Studio Quality Sound.

[keyboardguy]

What is your EQ set at? As you most likely know, 2-10-2 is 'flat'...


Oooppps,, I read that as LH1000 (Hartke)

sorry...........

[Will Kelly]

Originally Posted by keyboardguy

What is your EQ set at? As you most likely know, 2-10-2 is 'flat'...


Oooppps,, I read that as LH1000 (Hartke)

sorry...........

NO no no, you are using an Ashdown LG1000 right?

Boy, I hope you get some answers for this. That is one of the heads I am considering to power my Acmes

[bassix67]

Yes the LG1000. I'll be speaking with both Ashdown and Acme tomorrow. My first thought was a phase issue but the head has two separate poweramps in it hince the 500x2 @ 4ohms. I'm stumped. This amp was built to run 2 4ohm cabs at the same time.

[mntngrown]

Originally Posted by Will Kelly

NO no no, you are using an Ashdown LG1000 right?

Boy, I hope you get some answers for this. That is one of the heads I am considering to power my Acmes

Like I said mine did backup only for the Acmes, but my keys player is using it twice weekly in the studio now, 3 or more hour loud practices, through 2 cabs, a 4 ohm 500 watt 2x12, and an 8 ohm 12/5 without a hiccup.

[Lonnybass]

Sounds like driver overexcursion to me. Any damage to the surrounds?

Lonnybass

[bassix67]

The series 1 only farts(no pun)when running with the other cab. Tested the 1 by it self and it sounds nice and tight like it should.

[bassix67]

Originally Posted by mntngrown

Like I said mine did backup only for the Acmes, but my keys player is using it twice weekly in the studio now, 3 or more hour loud practices, through 2 cabs, a 4 ohm 500 watt 2x12, and an 8 ohm 12/5 without a hiccup.

So your keyboardist is running a 4ohm and an 8ohm cab into the LG1000 at the same time with no phase issue??

[DougD]

Originally Posted by bassix67

Just got a Acme B2 series 2 to go along with a series 1 B2 both 4ohm. Plugged them into my LG1000 (500w x 2 @ 4 ohms). All should be good right? Not!! My
Series 1 started farting when I hit the lows.
Both cabs sound great when singled, no farting at all. Put a meter on the cabs and both check in at around 4ohms. HELP!!!!

Your not running them in the bridged out are you? Just asking, because then you'll be running a 2 ohm load. If the amp has 2 separate 500w sides, then you should have an output for each side and then a bridged out (or something that bridges the sides) to combine the two. Make sure you are using the right outputs.

[Will Kelly]

The Ashdown is not bridgeable.

[WingKL]

Once you've checked that the polarity of your drivers are all the same via the 9V battery test, then chances are the issue is with how your amp us interacting with both the cabs. JimmyM has a similar issue with his mini Ampeg setup in another thread. Try a different amp to see if the issue still persists.

[KJung]

Originally Posted by bassix67

Just got a Acme B2 series 2 to go along with a series 1 B2 both 4ohm. Plugged them into my LG1000 (500w x 2 @ 4 ohms). All should be good right? Not!! My
Series 1 started farting when I hit the lows.
Both cabs sound great when singled, no farting at all. Put a meter on the cabs and both check in at around 4ohms. HELP!!!!

Strange. So, when you keep everything the same and just unplug the second cab while playing, the Series I immediately sounds fine? In other words, just the act of disconnecting the second cab results in a totally different sound from the first cab? I guess that could be an out of phase issue, although that is more of a thinning of the low end than distortion.

Something strange here, obviously.

[bassix67]

It's almost like when paired, the series 1
Can't all of the sudden handle the low B.
The speakers start flapping and rattling. But when singled, it's fine.