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The Acoustic Club

#81
I was thinking about the 200 watt head and 15 inch cab. Stopped by GC, played it and liked what I heard but there just wasn't enough volume there. I didn't realize until later that day that the cabs are 8 ohms each. Therefore, the 200 watt at 4 ohm head wasn't putting out all 200 watts. That explains that.

So then I was looking at the B200 combo. Its 200 watts into a 4 ohm speaker. So, lets say I plug a 4 ohm cab into the back of it... say a 2x10 or something like that. That takes me to 2 ohms total resistance. I'm now pushing more than 200 watts right? What would that be? 300 watts, 400 watts?

Just trying to figure out what my options are at expansion with the b200 combo. Thanks for any tips.:bassist:
 
#83
comet909 said:
I was thinking about the 200 watt head and 15 inch cab. Stopped by GC, played it and liked what I heard but there just wasn't enough volume there. I didn't realize until later that day that the cabs are 8 ohms each. Therefore, the 200 watt at 4 ohm head wasn't putting out all 200 watts. That explains that.

So then I was looking at the B200 combo. Its 200 watts into a 4 ohm speaker. So, lets say I plug a 4 ohm cab into the back of it... say a 2x10 or something like that. That takes me to 2 ohms total resistance. I'm now pushing more than 200 watts right? What would that be? 300 watts, 400 watts?

Just trying to figure out what my options are at expansion with the b200 combo. Thanks for any tips.:bassist:
Click to expand...

OK. The B200H head will power two of the 8 ohm cabinets in your choice of configuration. B115 or B410. Two 8 ohm cabs in parallel generates a 4 Ohm load and that is the minimum for the B200H. The jacks on the head and the cabs are all wired in parallel, so the formula is roughly the square root of the sum of the impedances of all combined cabs.

On the other hand, the B200 COMBO has a single 15" speaker, and uses the same power amp. It delivers the full power to the internal speaker, so ther is no need to add an additional cab to get to full power.

If you only need a single 15", the B200 combo will be louder. It also has a SERIES extension speaker jack. Now this gets a little confusing. What this means is that every time you ADD a speaker you also ADD the impedance. It provides the ability to add an additional speaker without hurting the amp.

The power distribution is a little quirky, so I won't go into all the details. Hope this helps.
 
#87
Stacknobuser said:
OK. The B200H head will power two of the 8 ohm cabinets in your choice of configuration. B115 or B410. Two 8 ohm cabs in parallel generates a 4 Ohm load and that is the minimum for the B200H. The jacks on the head and the cabs are all wired in parallel, so the formula is roughly the square root of the sum of the impedances of all combined cabs.

On the other hand, the B200 COMBO has a single 15" speaker, and uses the same power amp. It delivers the full power to the internal speaker, so ther is no need to add an additional cab to get to full power.

If you only need a single 15", the B200 combo will be louder. It also has a SERIES extension speaker jack. Now this gets a little confusing. What this means is that every time you ADD a speaker you also ADD the impedance. It provides the ability to add an additional speaker without hurting the amp.

The power distribution is a little quirky, so I won't go into all the details. Hope this helps.
Click to expand...
Along these lines, what would be the outcome if I were to add a 8ohm 410 cab to a b200 combo? About how much power drain, and if so, how much affect would it pose on the output of the built-in 15 incher? :confused:
 
#88
llamalor2112 said:
Along these lines, what would be the outcome if I were to add a 8ohm 410 cab to a b200 combo? About how much power drain, and if so, how much affect would it pose on the output of the built-in 15 incher? :confused:
Click to expand...

When you do this, two things will happen.

First, RMS power will drop because you are now running a 12 Ohm load. This would reduce the power output to around 150 watts. HOWEVER, you will be adding more speaker area and it should be louder depending on the 410 cabinet you use.

Also, the internal 15" will receive twice the power that the 410 receives due to the different impedances you asked about. If your 410 is 4 Ohm, the power would be divided equally.

If you think you are going to play most of the time wanting both a 1 x 15" and 4 x 10" cab, the B200H is probably the better choice.

If you think you will just use the combo most of the time, and only occasionally add an additional cabinet then go with the B200.

Hope this helps.
 
#89
I have a late 70's - early 1980s ? Acoustic 6x10 cabinet Serial number W 5442.
It is actually a keyboard cabinet, it is only 12" deep. But it sounds FANTASTIC.

The rest of the nameplate is gone, and I am trying to find out what kind of speakers are in it so I can build another one like it.

The speakers are stamped 13-15 67-7624 I don't see any brand name. I can provide photos if that helps.

Can anyone help me identify what kind of speakers these might be? Or the
year/make/model of the cabinet? Thanks!!! Mark
 
#93
Mark Joe said:
I have a late 70's - early 1980s ? Acoustic 6x10 cabinet Serial number W 5442.
It is actually a keyboard cabinet, it is only 12" deep. But it sounds FANTASTIC.

The rest of the nameplate is gone, and I am trying to find out what kind of speakers are in it so I can build another one like it.

The speakers are stamped 13-15 67-7624 I don't see any brand name. I can provide photos if that helps.

Can anyone help me identify what kind of speakers these might be? Or the
year/make/model of the cabinet? Thanks!!! Mark
Click to expand...
It sounds like an Acoustic 104

Link Removed

The speakers were made by Eminence. Your speakers would be from 1976, week 24.
 
#94
Stacknobuser said:
When you do this, two things will happen.

First, RMS power will drop because you are now running a 12 Ohm load. This would reduce the power output to around 150 watts. HOWEVER, you will be adding more speaker area and it should be louder depending on the 410 cabinet you use.

Also, the internal 15" will receive twice the power that the 410 receives due to the different impedances you asked about. If your 410 is 4 Ohm, the power would be divided equally.

If you think you are going to play most of the time wanting both a 1 x 15" and 4 x 10" cab, the B200H is probably the better choice.

If you think you will just use the combo most of the time, and only occasionally add an additional cabinet then go with the B200.

Hope this helps.
Click to expand...

Thanks a bunch!:)
The 410 I was planning was Acoustics own, I just was wondering if it was a viable option to just add the 410 to the b200 combo instead of spending an extra 300 dollars on the whole stack. Like you said, I actually do plan on occassionally using the 410 but only when I really need more high-end punch, otherwise I am more than happy with the low growl of the 15 in the combo.
 
#96
Mark Joe said:
I have a late 70's - early 1980s ? Acoustic 6x10 cabinet Serial number W 5442.
It is actually a keyboard cabinet, it is only 12" deep. But it sounds FANTASTIC.

The rest of the nameplate is gone, and I am trying to find out what kind of speakers are in it so I can build another one like it.

The speakers are stamped 13-15 67-7624 I don't see any brand name. I can provide photos if that helps.

Can anyone help me identify what kind of speakers these might be? Or the
year/make/model of the cabinet? Thanks!!! Mark
Click to expand...


Yep, it's 104. A really great cab btw! It's not for bass but can be used if you are responsible and dont go nuts. I've had amazing results using this cab as the top end for a bi-amp or tri-amp set up.
 
#97
Yes, that is the exact cab.

I was almost sure I would never find out what this cab is.
You all are great! You saved me a ton of time on research

Now I know what to buy for drivers for my new cab build, or
find another like it.

cooolness! yeah it is an awesome-sounding 6x10 and light too!!

Acoustic Club member #22
 
#98
I stopped by GC yesterday and tried the B200 combo. Nice sounding combo. I also tried the little B20 which really impressed me with the tone that came out of that little box and the especially the price. Nice little practice amp. They had a 15 cab but I didn't get to try it. It is huge though (compared to the B200 combo).
 
#99
i have an acoustic 104 cab with two blown speakers. i have no idea what the rms handling or even the ohms is for it. i used it as an extension for my 35w ORANGE crush practice amp when i first started playing bass in a cruddy metal band and i was honestly loud enough to play nearly any bar in the state.

i later picked up an acoustic 140 head from an abandoned trailer that a punk band i played for practiced in. its got some serious issues because it won't even turn on, but its solid state and very very simple. i hope to have it fixed before the end of the year so i can just run my sansamp into it and the head into the 6x10 to come up with a pretty decent sound i'd say.

i'm trying to find someone to work on the cab right now but i am trying to find out what replacement speakers i should use if i were to redo all 6 speakers at an attempt to get as close to a 4 ohm setup as possible. not too concerned about keeping the same tone. i just really like the cab cuz its nice and tight and very compact for a 6x10. any suggestions on what speakers i should get to make that 4 ohm combination?

[my main head is an ampeg b5r and i would love to be able to push 300w through this cab or 250w while running the other 250w through a 2x15 cab that i have yet to purchase ;D]
 
#100
oh and btw, if anyone is interested i'm willing to sell the working speakers that are in the cab, they're all original except for one, but its of the same design and looks to have been replaced back before they stopped making that kind of speaker. i KNOW one is blown because some how the entire cone is GONE, no rips, no tears... its completely GONE. the one next to it works but it buzzes and pops and sounds terrible, but theres four left, three original and one obviously replaced.

i plan on replacing them all with 6 - jensen MOD 10-50 50w speakers but i have no idea what ohms i should get the speakers in [availiable in 4/8/16/32 ohms] or how i would wire them to get the cab as close to 4 ohms as possible... i hear 5.3 is as close as i can get but i wouldn't know which to set series and which to set parallel.

[and apparently from the research i've done, this acoustic 140 amp is the exact same thing as the acoustic 154 guitar amp, no matter, i would use my b5r for when i play bass and use the acoustic amp for when i play guitar, utilizing the same cab for both :)]
 

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