this may sound dumb to most people but i've always used cabs that had no tweeter in them.
so for this example let's take a GK head and a GK 4x12 cab with a tweeter in it.
if i were to play it i would turn the tweeter knob all the way off. would i need to run the cab in bi-amp mode or full range?
doesn't the tweeter have a built-in crossover on it already?
dunno just trying to sort it out in my head. please explain.
Not sure the specifics of the GK4x12 cab you are referring to, but Bi-Amp simply means splitting the output of your pre-amp to two separate signals and applying a filter to each of them (hi-pass & low-pass) before sending each to it's own separate amplifier and then on to separate speakers designed for the high signal and low signal.
With a few exceptions, bi-amping usually refers to separate cabinets.
(bi-amping is not the same as a single 2-way or 3-way speaker that has a "speaker level" crossover filter that divides the speaker level signal, from a single amplifier- to the appropriate tweeter or woofer. - Again, I don't know the specifics of your GK412, but a speaker level crossover is much more common within a single cabinet.)
In bi-amp the signal is split into it's highs, including mids, and low components. The mids and highs are sent to the high range drivers and the lows to the woofers. This requires an electronic crossover and two separate amplifiers each driving suitable drivers. GK has all this built into their amplifiers and suitable wiring and drivers in their cabinets. A four core speaker cable is needed to make all this work.
so if i was running with the tweeter knob on the amp head off would i use the cab at the full range setting?
if i ran the cab at the bi-amp setting would only low end come out of the woofers and high end go to the tweeter?
or do they have it set up where full range comes out of the woofers and highs go to the tweeter as well when running in bi-amp mode on the cab?
If you run the amp full range the cabinet should be set to full range. If you set both to bi-amp only the lows will be sent to the woofers.
ok so i'd need to run it full range on the cab. thanks.
i had read somewhere if you run the cab at full range and turn on the tweeter it can damage the tweeter since the lower frequencies will be going to the tweeter as well.
The cab has a crossover to protect the tweeter in full range.
hmmm so that's weird. why would you wanna run it bi-amp then?
you could just run it full range and add tweeter if you wanted the extra highs or turn it down if you didn't.
what is the benefit to running it bi-amp?
is bi-amp something generally just used if you are running 2 cabs with say a 15" cab for the lows and a 4x10 cab or the highs and mids?
In cabs with tweeters, there is a built-in "crossover" for the tweeter. You're always using the cabinet "full range" unless you've split the signal to the cabinet, BEFORE the cabinet. But if you turn the tweeter off, I don't know if the "highs" will be redirected to the main speakers, or if you will "lose them." I think that's your question?
Also, I have heard that turning a tweeter all the way off is not a good idea, for the tweeter, or for one's amp in general. Maybe someone else can comment on that.
Bi-Amp means exactly that....using two amps to amplify different parts of your instrument's output. Usually that means powering the lows with lots of watts, through big speakers, and the mids/highs with fewer watts, through (usually) smaller speakers, which may or may not include tweeters.
yeah there's a switch on the back of the cab. bi-amp or full range. you choose which you wanna run.
for example a GK fusion 550 head runs 500watts for the woofers and 50watts for the tweeter. i hate the sound of a tweeter since i don't slap or anything. i would run the tweeter knob all the way down.
my GK mb115 combo just has the horn on/off button but full range comes out of the woofer at all times.
perhaps the bi-amp feature is best used only if you are running 2 seperate cabs instead of just 1?
Normally, yeah, you'd run two cabs.
Sounds like this GK amp/cab combo is kinda unique, in that it splits the signal in two for one cabinet. Most biamp set-ups wouldn't use JUST a tweeter for the highs, actually.
well i'm reading the manual online. it seems the tweeter knob on the front of the amp only works if you are in bi-amp mode. if in full range there is a knob on back of the cab to turn the tweeter volume down or up.
you can use a 2 pin speakon cable and it will only run the woofers but the cab comes with a 4 pin speakon cable that runs the woofers and the tweeter. i guess you could just run it full range and then turn the tweeter down on the back of the cab itself.
i dunno it's kindof confusing. basically you can run it either way bi-amp or full range and it's not gonna be any different from what i get out of reading it.
full range is coming out of the woofers no matter which way you run it.
you can run it bi-amp and turn down the tweeter knob on the amp or you can run it full range and turn down the tweeter knob on the back of the cab. either way it's the same result.
i think what it's saying basically if you are running a GK head with this GK cab then run it in bi-amp mode and if you are running it with another head then use it in full range mode.
Horn Bi-Amp System:
The Neo Series cabinets include a passive
crossover for standard operation or may be used
with GK’s unique Horn Bi-Amp System.
Horn Bi-Amp compatible amplifiers use an
electronic crossover to split the signal between
the main amplifier and a separate horn (tweeter)
amplifier. The horn amp sends signals above
5kHz to the horn while the main amplifier sends
a full range signal to the woofers. Optionally
you can engage the Woofer High-Cut to to cut
signals above 5kHZ from the main amplifier.
Both signals are delivered to the cabinet via a
The 50W horn amplifier has a fixed frequency
output of 5kHz and up (high frequencies only). It
will not provide a useable signal to drive a seperate
To avoid risk of damage to the equipment, do
not use a 4-conductor Speakon« cable with non GK
cabinets. Instead use a 2-conductor Speakon« or
╝” speaker cable.
If you don't like tweeters, with the G-K biamp heads leave the cab in biamp and keep the "Horn or Tweeter" knob off (full ccw) on the head. If you don't have a HMS G-K head (like the MB series, 400RB I/II/III or IV or BL600) or using a different brand amp head putting the cab in Biamp is like an off switch for the tweeter. With the cab in "Biamp" the horn is only connected to the 2+,2- connection on the cab's speakon.
If I understand the way Chef explained it, the Boost knob only effects the main amp and bypasses the tweeter amp. This sends "growl" to the woofers where it sounds best and sends "sweets" to the tweet.
I think I got that right...
I finally figure it out for myself after testing it.
The GK 2001RB plus GK NEO 4x12 cab is unique when it comes to bi-amp.
When I do use my 2001RB head, I tend to use it full range through my 4x12 cab when playing smooth or phat sounds.
I adjust my tweeter on the back of the cab.
If i'm pushing the cab for growl, dirt, grind, I usually put it in bi-amp mode. This helps with avoiding growl, or distortion going to the tweeter. The tweeter stays pretty clean and I just dial in, from the front of the Head unit, how much I need. Which usually I only have the tweeter at 10% as I don't like too much high frequencies.
This doesn't apply to distortion pedals. Your tweeter will put out what your putting in.
Hopefully this helps you understand and when to actually use.
The only other bonus is that you get to control your tweeter from the amp instead of the cab in bi-amp mode. This is useful.
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