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FDP Forum / Fender Bass Guitars and Bass Amps / anyone ever substituted a keyboard amp for bass.

D Bone

Charlotte, NC USA

"Ti-Ming" Ancient Chinese Secret...
Mar 9th, 2016 11:50 PM   Edit   Profile   Print Topic   Search Topic

This amp fell to me. A neighbor who was moving literally brought it to the front door and asked if I could use it. Saw the Fender logo on the grille and said sure. First free amp ever for me. KXR200. They don't make it anymore, but I figured if it can support the range of a keyboard, why not a bass? Can it hurt it? It's got a 15" driver and a dual horn. Manual doesn't mention a bass anywhere. Anyone else use one?


huck

us

Mar 10th, 2016 12:26 AM   Edit   Profile   Print Topic   Search Topic

i used one of the peavey kb series for years back in the day. i generally played an active bass through it, and never had any problems. it had more high end than most bass amps in its price range, and that's the sound i was looking for at the time.

reverendrob
FDP Data Goon
Moderator

When I sin

I sin real good
Mar 10th, 2016 02:46 AM   Edit   Profile   Print Topic   Search Topic

If you can EQ it right and the horn doesn't squawk (if one present), will be fine!

D Bone

Charlotte, NC USA

"Ti-Ming" Ancient Chinese Secret...
Mar 10th, 2016 07:12 AM   Edit   Profile   Print Topic   Search Topic

Has a 15 and a dual piezo horn. Was monkeying around with it last night. Yeah, it can get bright if you let it, but with flats on my Precision, it's not an issue. It just seems convenient to have 4 separate channels. I just didn't know if it might hurt the amp.

Taildragger
Contributing Member
********

USA

"bald to the bone"
Mar 10th, 2016 08:46 AM   Edit   Profile   Print Topic   Search Topic

I would think that the speaker would be the most likely candidate for being damaged by the the excursion of trying to produce low frequencies, but that's just a guess.

I have an old Fender Music Master Bass amp that a put a Weber in so I could horse around using it as a guitar amp. When I decided to use it for living room bass noodling, I put the original speaker back in it so I wouldn't destroy the Weber, which was designed to reproduce guitar frequencies.

As you doubtless already know, reproducing low frequencies requires more power in general. 200 watts isn't much power for a bass amp. But that would raise more of an issue of not being able to wring enough volume out of it rather than hurting it.

KXR-200 owner's manual:

(This message was last edited by Taildragger at 10:47 AM, Mar 10th, 2016)

Te 52

Laws of Physics

strictly enforced
Mar 10th, 2016 09:00 AM   Edit   Profile   Print Topic   Search Topic

"...I would think that the speaker would be the most likely candidate for being damaged by the the excursion of trying to produce low frequencies, but that's just a guess..."

The lowest note on an 88-key keyboard is A0 (27.5 Hz), so a proper keyboard amp should be capable of handling a frequency that low.

I've found that keyboard amps and bass amps make reasonably good substitutes for one another.


Taildragger
Contributing Member
********

USA

"bald to the bone"
Mar 10th, 2016 09:05 AM   Edit   Profile   Print Topic   Search Topic

I defer to your more extensive experience.

D Bone

Charlotte, NC USA

"Ti-Ming" Ancient Chinese Secret...
Mar 10th, 2016 11:58 AM   Edit   Profile   Print Topic   Search Topic

My daughter (who also plays bass) said the same thing. But it's not the frequency issue that I'm really worried about so much, it's that keyboards play at fairly even levels. Bass guitars have dynamic transients and peak quick & hard depending on the player. It does have the old "Delta-Comp" anti-clip compressor. It's kinda neat, having 4 separate channels, the 4th channel has a 4 band EQ. I was thinking it might make either a good slave amp for the drummer, or a practice amp. I can always trade/sell it for something. as I said it was FREE. Just don't want to toast it. Thanks.

D Bone

Charlotte, NC USA

"Ti-Ming" Ancient Chinese Secret...
Mar 10th, 2016 11:58 AM   Edit   Profile   Print Topic   Search Topic

(This message was last edited by D Bone at 02:02 PM, Mar 10th, 2016)

RhinoBass
Contributing Member
**********
***

Really?

Seriously?
Mar 10th, 2016 07:48 PM   Edit   Profile   Print Topic   Search Topic

I wouldn't sweat it.

Tony Wright

Stillwater, OK

Built for comfort, not for speed.
Mar 12th, 2016 01:48 PM   Edit   Profile   Print Topic   Search Topic

I used a older KB300 keyboard amp for rehearsals for the better part of six months...also used a smaller (and newer) Peavey keyboard amp for low volume rehearsals on many occasions with that band. It was a hassle taking my rig. Drummer took snare and hats. Keyboard, acoustic electric guitar and vocals thru mixer to the one PA cabinet.

Current band, at rehearsals and two of our gigs, I am using a Sans Amp DI into the mixer along with two vocals and acoustic electric guitar into a single Yamaha DBR10 powered speaker. (Gigs we use two DBR10 powered cabinets. We position them about parallel to our shoulders facing the audience so we get enough sound for monitor and main.

For about 5 years I used a small 30 Watt, 2-10 guitar combo amp under the table where the computer is to learn sons on...obviously low volume, but it worked.

My point is depending on what you need, you can get by with a lot less than 8x10 with a 300 Watt tube head...ifn yall knowd whut Ah mean....(in my best Okie accent)

kart24
Contributing Member
**********

Vacaville CA

Runs with scissors !!
Mar 13th, 2016 11:30 PM   Edit   Profile   Print Topic   Search Topic

I've always used old B/F Fenders to play bass or keyboards since '65. Mostly Bandmasters or Showmans. No problems yet.

trea27

united states

swampgas
Jun 21st, 2016 12:32 PM   Edit   Profile   Print Topic   Search Topic

Yes an old Peavey blew the speaker right away. I believe it had a 15 scorpion. I fix it and traded for a old Fender PA head and a 15 cab. Used it for a whole summer it work great, then finally got the money and bought a Jeff Berlin Markbass combo.

Steve Dallman
Contributing Member
*********

Merrill, Wisconsin

Age is just a number...mine is big
Jun 25th, 2016 07:28 AM   Edit   Profile   Print Topic   Search Topic

There is no problem, but keyboards are rather low impedance out instruments. The "high" impedance inputs are 18.2k impedance. A passive bass wants to see 500k or above. That low of an impedance will reduce the volume and clarity of a passive bass, which may or not be a problem. With a low impedance, active bass this won't be an issue.

The turnover points of the EQ are different than a bass amp. With the three band EQ, the bass control is set at 130Hz, which is much higher than the normal 40-80Hz of most bass controls in bass amps. Again, it might be no problem. In the 4 band EQ channel, it is 125Hz...not much different.

The mids and highs are in OK places.

Keyboards usually have as much low end as a bass. The speaker should be just fine...generic Eminence type. Power is a little low for modern bass use, but if it's loud enough for you, good enough.

The Delta Comp, a 20dB compressor might be good to use.

If you patch a Boss type effects pedal, with electronic switching between your bass and the amp, even if you leave the pedal switched off, the buffer in the pedal will help your passive bass match the input impedance of the amp, and may sound better.

Steve Dallman
Contributing Member
*********

Merrill, Wisconsin

Age is just a number...mine is big
Jun 25th, 2016 07:31 AM   Edit   Profile   Print Topic   Search Topic

The Dual Piezo horn has two piezo drivers on it, likely wired in parallel. If you don't like the horn, instead of disconnecting it, you may want to pull it, and rewire the drivers in series instead of parallel which will lower the output significantly. IF you use a passive bass, with the low impedance, you may not need this. The loading of the low impedance will limit your bass's high end a lot. With an active bass, or with a buffering pedal, this may be a good idea.

FDP Forum / Fender Bass Guitars and Bass Amps / anyone ever substituted a keyboard amp for bass.




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