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FDP Forum / Amp Mods, Repairs, and Projects / Boss Katana Head Question

telewired
Contributing Member
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Kansas City, Mo.

counting it all joy
Jul 29th, 2017 04:15 PM   Edit   Profile   Print Topic   Search Topic

So the amp says 8ohm speaker or higher-----
So is it obvious that higher would be 16ohm??
In this head I can run it at 1/2w 50w or 100w......

So what is the difference going to be if I use a 8ohm cabinet or a 16ohm cabinet?
I am looking at a used vertical 2x12 open back with two Weber 30watt alnico speakers---IS this ok or should I look for something else----The Webers are a SILVER BELL and a BLUE DOG----

Te 52

Laws of Physics

strictly enforced
Jul 29th, 2017 05:11 PM   Edit   Profile   Print Topic   Search Topic

On a tube amp, you can use a speaker that's half the spec'd impedance and get away with it, e.g., you can use a 4 ohm speaker in an amp spec'd for 8 ohms.

On a solid state amp like the Katana, you can't. If it says 8 ohms, it means 8 ohms MINIMUM. On the other hand, you can use a higher impedance speaker with no worries. Downside is that the higher the speaker impedance, the less volume you'll get.

As to the specific cab you're looking at, it depends on the impedance of the individual speakers and how they're wired. If they're two 8 ohm speakers, you'll need to wire them in series to get a 16 ohm load. If they're two 16 ohm speakers, you can wire them in parallel to get an 8 ohm load. You'll get a little more volume out of the 8 ohm configuration.

telewired
Contributing Member
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Kansas City, Mo.

counting it all joy
Jul 29th, 2017 05:21 PM   Edit   Profile   Print Topic   Search Topic

They are 2 8 ohm speakers wired for 16ohms----
The Katana head says by speaker jack--- 8ohm or Higher...
So 16 ohm will work correct? I just play by myself in my home studio--- So I know 50watts is plenty---more than enough.....Also the cab is rated at RMS 60

Mike DeTorrice
Contributing Member
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USA

Jul 29th, 2017 05:32 PM   Edit   Profile   Print Topic   Search Topic

16 ohms with the head should be no problem at all. As mentioned, you will get somewhat less power, but that would be unnoticeable in your circumstances.

As you know, the head also has a built-in speaker that is reportedly surprising loud and very useable in many situations, even including some live use.

The power section scales back to 30 watts/15 watts/0.25 watts or so when using the internal speaker so you can crank it up without fear and there is also a fairly easy mod out there that would make this lower output available at an output 1/4 in jack, too.

Mike



telewired
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Kansas City, Mo.

counting it all joy
Jul 29th, 2017 06:11 PM   Edit   Profile   Print Topic   Search Topic

Mike, can you explain the mod to me--I could run the 2x12 16ohm speaker cab at 15 or 30 or 1/4watt?

stratcowboy
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USA/Taos, NM

Jul 29th, 2017 09:50 PM   Edit   Profile   Print Topic   Search Topic

"...The Webers are a SILVER BELL and a BLUE DOG----"

GREAT combination of speakers!

Mike DeTorrice
Contributing Member
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USA

Jul 29th, 2017 11:10 PM   Edit   Profile   Print Topic   Search Topic

Hi telewired : The method for externally accessing the Katana head's low power section is about halfway down the page at this site :

Katana Head low power amp mod

Mike DeTorrice
Contributing Member
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USA

Jul 30th, 2017 04:41 AM   Edit   Profile   Print Topic   Search Topic

Actually the Katana mod would allow you to :

(1) Run external speakers/cabs driven at 100, 50, or 0.5 watts at 8 ohms (or 16 ohms at lesser power).

(2) You can also use the internal head speaker at 30, 15 or 0.15 watts.

(3) And with the mod, you can also drive external speakers/cabs at 30, 15 and 0.15 watts.

(4) You can also, of course, shut off the speakers entirely and simply use the headphone out, the line-out or the USB out ..... or all of those at once.

Mike

telewired
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Kansas City, Mo.

counting it all joy
Jul 30th, 2017 09:18 AM   Edit   Profile   Print Topic   Search Topic

I thought the USB was just for downloading or modifying patches....
Also 1 and 2 above are how I got the amp new correct---the mod would have nothing to do with 1 and 2 correct?
And number 3 is still at 8ohms or 16ohms (less power) correct?

Mike DeTorrice
Contributing Member
**

USA

Jul 30th, 2017 11:53 AM   Edit   Profile   Print Topic   Search Topic

Hi telewired :

The USB is also available as an output, as is seen in the block diagram provided by Roland/Boss. I believe it can be set to capture and output the entire amp sound (FX and all), or set to output only the clean input guitar signal. (which I understand can be useful for re-amping or making a clean safety track).

Yes, point 1 and 2 are exactly how the Katana came from the factory.

Point 3 would be only if the mod was done to add another 1/4 inch speaker output which would tap the low-power internal amplifier. Presumably, one or the other of the speaker outputs would be used at a time and would be driving an 8 or 16 ohm load.

One point that has been mentioned with the mod is that the jack used must be an insulated one to avoid grounding out to the chassis and due to the electrical design of the Katana amp. The additional output jack would also operate like the regular speaker out in that it would automatically turn off the internal speaker when you plug in an external one.

Mike

telewired
Contributing Member
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Kansas City, Mo.

counting it all joy
Jul 31st, 2017 10:50 AM   Edit   Profile   Print Topic   Search Topic

Kind of like the idea of running at 30watts----but 50 may be fine as well especially for the looping-----

pdf64

UK

Aug 1st, 2017 08:53 AM   Edit   Profile   Print Topic   Search Topic

Do these sound good when overdriving the power amp?
Solid state amps sometimes don't (possible understatement!).
I guess these are class D with SMPS power supply?
So it may be a whole different thing.
But I don't recall those class D bass amps I've heard sounding too good if they're turned up too much.
The point being that various power output options may not be particularly beneficial.
The idea being to keep the power amp as linear as possible and let the modelling produce the tone.
To do that, a solid state map has to be a lot more powerful than a typical tube amp, as the high output impedance / output transformer of a tube amp allows its power output to track the speaker's impedance.

Mike DeTorrice
Contributing Member
**

USA

Aug 3rd, 2017 07:40 PM   Edit   Profile   Print Topic   Search Topic

Although I have not cranked up my Katana 50 to really high output levels, many who do (and also with the Katana 100's) report they sound outstanding, with a very tube-like response.

Boss made a point of ensuring that the 50 and 100 watt Katanas not only had a credible amp/speaker interaction, but also that the wattage specified really DOES match with that expected of tube 50 and 100 watt power amps. They are loud !

Several have reported that a speaker "break-in" period can benefit the tone even more. Others indicate that the 100 watt combo speakers are excellent (and get better with break-in use) while still others feel, while the 50 watt speaker is good, there are some who feel a alternate 12" speaker really made their 50 come alive.

The Katana speakers (both 50 watt 12" and larger 100 watt 12") are actual guitar speakers and not either extended range or FRFR type.

Mike

thumbpicker
Contributing Member
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St. Louis

"Thumbpicks don't slide into soundholes"
Sep 24th, 2017 06:54 AM   Edit   Profile   Print Topic   Search Topic

I have used the Katana 50 .The recording out or headphone out lines out to a PA and sounds really true to the amps speaker. I haven't tried the USB out yet . My DAW or my computer always has a conflict when switching around USB sources for some reason.

FDP Forum / Amp Mods, Repairs, and Projects / Boss Katana Head Question




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