GK 1001RBII+neo 212 II question

[Ogge]

Hi!

Finally scored a used GK rig which I'm really happy about. The GK-tone is just what I was looking for. =)

Though I'm starting to think there is something wrong with my tweeter OR the bi-amp system in the amp.

First question: If I use a gk cable (which enables bi-amping) and turn the switch on the cab to bi-amp, should I be able to hear the hi frequencies in the horn but nothing from the big speakers, if I have horn volume level at twelve but turn the woofer volume down to zero?

Right now I'ts completely silent and it shouldn't because those two volume-knobs are independent right?

When playing at high volume I also can't hear any difference at all when turning the tweeter volume from zero to max. I should hear a difference right?

I also tried to turn the cab to full range so I would be able to adjust the tweeter level on the back of the cab. Even than I couldn't hear any difference when turning from min to max.

Is there something wrong with my tweeter in the cab or could it be the amp? The problem should be in the cab because it didn't work when using full range?

Or is the tweeter unnoticable so it's practicaly useless?

I use a Yamaha TRB JP2 6-string with pretty fresh strings so the bass itself is deffinately capable of producing clear highs...

Thanks //Oskar

[DJ Bebop]

You say you don't hear the tweet when you are going full range?
I'd start there. Maybe a blown fuse or bulb on the crossover for the tweeter, if it has that sort of thing.

[Ogge]

I also think the problem should be in the cab. Does anyone know about fuses and stuf. How should I proceed.

But when runing in bi-amp the crossover in the cab is not used so therefore I don't think thats the problem. Can some wiring in the cab to the tweeter have come loose?

[DJ Bebop]

Originally Posted by Ogge

I also think the problem should be in the cab. Does anyone know about fuses and stuf. How should I proceed.

But when runing in bi-amp the crossover in the cab is not used so therefore I don't think thats the problem. Can some wiring in the cab to the tweeter have come loose?

Yep, I'd start by removing ( I'm going blind here ) the plate that
the cross over maybe on, where you plug into the cabinet. Sometime the crossover may be on the back, if not you can at least see in. If not, time to pull a speaker and get in there. If you don't feel good doing that, find a musical friend that is, if not, take it in to a shop.

That's all I got, Anyone else?

[christw]

I once had an Avatar 115 where the tweeter's structure had broken away from it's plastic encasing so while it looked like there was a horn, it was actually lost inside the cab.

Check your wires, yes. Have you tried running the GK and cab full range with a normal 1/4" cable and it didn't work? Wasn't clear if you did.

[mouthmw]

GK's tweeters are crossed at 5 Khz. It's not noticeable a lot to be honest. I hardly notice mine as well. I doubt your cab is the problem. It's a really high frequency for a bass guitar, and it kind of makes a difference in the band setting I guess where it's supposed to bring those shimmering highs for a more modern sound.
Do you hear any hiss? If you do, I don't think there's a problem. It's just very high.

[Anarchyok]

No, you should be able to hear it. I've run the same set up and you can definently hear when the tweeter is working. I'd bet money on it being a blown tweeter or fuse in the cab. The fact you can't hear it in full range means your tweeter amp hasn't blown (as has just happened to me with my Fusion 550)

[Ogge]

Thank you for all replies!

There is no difference in hiss what so ever when changing the level of the tweeter regardless of using bi-amp mode or full range.

Actually I haven't tried 1/4` cable in full range mode. That will be the first thing to try tomorrow. If that doesn't work I will let my local music store to take a look at it.

Thanks!

[DJ Bebop]

One more thing, maybe the cable is NOT four conductor, it maybe two, so you would not be bi-amping at all.
Check it.

[Ogge]

The cable I'm using is a GK speakon cable which allows bi amping. The thing is, even if it wasn't a four conductor the tweeter and the tweeter control on the back of the cab should work when using full range mode, but it doesn't. So I'm starting to really think the problem is in the cab.

But I will try with another amp in fullrange to see if there is any difference. If the tweeter and tweeter controll would work with another amp I will have to start look at the amp itself.

[DJ Bebop]

Yep, maybe fuse or, bulb inside.

[DJ Bebop]

You've tried a 1/4 in speaker cable full range?

[singlemalt]

Take the end of that cable apart and make sure you have four wires connected to the speakon end. Full range is on #1 +/- , high on the #2 +/-.

Lots of speakon cables use 4 pole ends with only two wires connected. The four wire stuff is really fat and stiff.

If you are handy, pull the horn out and test it by making a cable to connect it an audio source, ideally the high side of your 1001 rb 2. Same thing to test the high side of your amp for output, hook it to some kind of 4 or 8 ohm driver.

If those two things are working, the cab has some kind of wiring issue.

The GK manual and wiring diagrams are online.

The 5K and up spectrum is pretty thin, string noise, clicks and squeaks, but you can really hear the difference with and without.

I have not used the any of the GK cabs, but I run the horns in my fEarful cabs off the GK 1001 rb 2 high side circuit with no problems. The horns make a considerable difference. Not much there with the main woofer control all the way down and only the horns running, very thin sound, and not much of that, but with the amp cranked up the horns can really bring out the modern bright sound. Really nice with an EUB or string bass with a pickup.

[ljazz]

Perhaps I've missed it, but you do have the woofer hi-cut engaged right? The HMS doesn't work just by flipping the cab to biamp. You have to engage the woofer hi-cut to activate the tweeter amp. Note - the tweeter hi-cut will cut frequencies over 10k if I'm recalling correctly.

That said, once you hit the woofer hi-cut, and switch the cab to biamp, you should be able to hear a little bit coming from the tweeter when you turn down the master and come up on the tweeter volume.

[mouthmw]

I was always under impression that woofer hi cut disengaged sends the full range to woofers but tweeter still gets 5khz>. And woofer hi cut engaged only cuts anything above 5khz for your woofers. Might be more noticable with it engaged but I don't think it's necessary for biamp to work.

[lesliegl]

Ive just bought a new 212 off Amazon and from what i can gatehr the horns not working..im using a new Genz Benz Streamliner 600 with it running full range and i cant hear anything coming thru the horn no matter what i do with the level control on the back..Im in Australia so theres no chance of sending it back to the US ..im quite happy with the sound of it as is...but ill have to take it to a shop to get it checked out in time...the blown fuse thing sounds quite probable..but in a new speaker box??


Leslie

[Ogge]

Hi guys and thank you for your concerns in my problem.

I have been EXTREMELY buissy, and have had no time to experiment with the rig this week.

lesliegl: It seems like we have the exact same problem. I will post here again when I have had the time to experiment some more.

Cheers!

[lesliegl]

Thanks for that Ogge..ill look forward to what you find out..i read another post on here somewhere where a person had to replace the fuses/bulbs on the back of the crossover as the horn wasnt working...theres two of them and he posted a pic of the fuses in place and what they looked like

Leslie

[B-string]

BTW they are lamps not fuses, although extreme power levels will burn them out.

[DJ Bebop]

Yep, auto dome light bulb. BUT NOT THE LED KIND.