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FDP Forum / Fender Bass Guitars and Bass Amps / Bassman 135 with cabinet 2x D140F - Ohms?

ChristophK

Germany

Apr 20th, 2017 03:03 AM   Edit   Profile   Print Topic   Search Topic

Acquired a Bassman 135 w/ cabinet containing two D140F. Had no time yet to open it up to look after the speakers. Rig is still in my van.

Just curious what ohms value each speaker has if it's factory stock? What speakers are to be expected there? Lansing with Fender brand on it , red label or yellow label? Since the bass amp has 4 Ohms out, wouldn't the speakers have to be 2x 8 Ohms in parallel? But someone told me they were 16 Ohms each (?)

Could someone enlighten me? Thanks.

--
Christoph


sparkymeb

Canada

PEI (East Coast)
Apr 20th, 2017 09:26 AM   Edit   Profile   Print Topic   Search Topic

If you have a multi-meter, you could check that yourself. Plug in a speaker cable, and with the meter on the lowest resistance setting, hold the probes on the tip and sleeve of the jack. The reading you get will be about 2/3 or 3/4 of the actual value (ie 8 ohms will read as 4.5-6 ohms). It's also a good check of the speaker(s) condition.

A quick Google of D140F seems to show a consensus of 8 ohms...

ChristophK

Germany

Apr 20th, 2017 11:57 AM   Edit   Profile   Print Topic   Search Topic

I'm not sure whether D140F automatically means 8 Ohms. I for one own a pair of K140 having 16 Ohms voice coil. And as said, the rig is in my van that's why I'm asking beforehand in this forum, hoping someone knowing would come up saying that e.g. 8 Ohms is the impedance of the box factorywise. I know the relation between DC resistance and impedance, BTW.

But the solution came out easily now. I overlooked that there was a serial number plate with speaker and total ohmage saying 4 Ohms total, Speakers 8 Ohms

(This message was last edited by ChristophK at 03:26 PM, Apr 20th, 2017)

ChristophK

Germany

Apr 23rd, 2017 02:02 AM   Edit   Profile   Print Topic   Search Topic

Yesterday in my rehearsal room I had a closer look at the amp and cabinet. The box is named Bassman 50. Funnily, the centering cups on the top for fixating the amp are in different places, i.e. don't match the footprint of the bassman 135.

So is this box underpowered then? Opened up the back and found two pristine Fender signature speakers (orange) D140F 8Ohms 043091-A.

Had there been an even larger box in the Bassman product line?

--
Christoph


reverendrob
FDP Data Goon
Moderator

We all want

our time in hell
Apr 23rd, 2017 06:34 AM   Edit   Profile   Print Topic   Search Topic

Yea, there's a 4x12 for that amp IIRC.

The factory cabs of the era were stamped with whatever amp they went with (Bassman 50, as an example).

You could well shred those speakers if you crank it.

ChristophK

Germany

Apr 23rd, 2017 12:42 PM   Edit   Profile   Print Topic   Search Topic

@reverendrob: shred which ones? The 4x12 or the two 15"? Or both arrangements?
If the 12" were JBL E120, probably not?

(This message was last edited by ChristophK at 02:42 PM, Apr 23rd, 2017)

6G6

Texas

Fender power to the people!
Apr 26th, 2017 06:40 AM   Edit   Profile   Print Topic   Search Topic

The 12s in the 412 cab are nothing special.
That's why they used 4 of them. ;^D
That cab is mostly unloved.

A pair of D140s should be up to the task, if you don't max out the bass and crank up the volume.
If in doubt, you could look for second cab.
Fenders tend to live with the impedence mismatch.

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

Merrill, Wisconsin

Age is just a number...mine is big
May 2nd, 2017 09:47 AM   Edit   Profile   Print Topic   Search Topic

The 4X12 was HUGE and used a trapezoidal baffle that aimed each speaker in a different direction. The seams usually came loose and the speakers were rather wimpy guitar speakers. Many of the used ones have tons of silicone on the seams. Look at pics on line and you'll see most have been "repaired."

An FDP'r a few years ago had one and wanted to load it with speakers that would work well for bass, but also with guitar. I got him Four 110 Jensen Mods. While the Xmas is low for bass (excursion) there are 4 and with a 100 watt head, worked great. He said guitar also sounded great.

I'm glad I don't have to move that cabinet.

(This message was last edited by Steve Dallman at 02:11 PM, May 3rd, 2017)

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

Merrill, Wisconsin

Age is just a number...mine is big
May 2nd, 2017 09:48 AM   Edit   Profile   Print Topic   Search Topic

Here's the cabinet with the baffle off.

Bassman 135 cabinet

Bubbalou

USA

THE LOW END OF UPPER TEJAS
May 14th, 2017 03:01 PM   Edit   Profile   Print Topic   Search Topic

The JBL D-140 F likes a smaller internal area than other speakers to sound the best. BTW: the JBL D140 F 15's I had wired opposite polarity than other speakers I have use (which I thought was screwy LOL ). The sound very good but you cannot drive them extremely hard as the voice coil will bottom out and you could damage them.
Are they wired + to + and - to - from one speaker to the next (ie. in parallel) or + to one speaker and it's - to + of the other speaker then - of that speaker to output jack?

FDP Forum / Fender Bass Guitars and Bass Amps / Bassman 135 with cabinet 2x D140F - Ohms?




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