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FDP Forum / Performer's Corner / any reason NOT to use two bass amps (vs one amp, two speakers)?

wborys
OldFartBassPlayerWalt

Robbinsville, NJ

what do you mean the bass is too loud?
Mar 1st, 2016 08:57 AM   Edit   Profile   Print Topic   Search Topic

oh boy, second gig for my wanna-be rock band, (60s rock), a church basement dance. The second in 9
months for oldFartBassPlayer

I have a Ashdown Mag300 with a 15", great sound
in practice, but worry will it fill a large room.

My Friend can loan me a second 15 cabinet.

I have powerful GK bass head lying around-

so back to my titled question? Should I daisy
chain, or use two separate amp setups. Any
advantage one over the other? I already am
thinking different EQs to better cover ranges...

ofbpWalt


themaestro
Contributing Member
**********
****

Wichita, Kansas

Drums = pulse, Bass = heartbeat
Mar 1st, 2016 10:04 AM   Edit   Profile   Print Topic   Search Topic

Walt, just how loud is your band? Will bass be in the PA? If so, I would just use the Mag300 for onstage monitoring and let the PA carry the room.

Otherwise...

Your setup might depend on the impedence of your cabinets.

The Mag300 isn't a bad amp. I have a Mag300 head lent out to my son. I used to gig with it. The Mag300 is about 150 watts into 8 ohms and about 300 watts into 4 ohms.

Is the Mag a combo or head/cab? If a combo, is there an external speaker jack on the back? If so, the combo speaker is probably 8 ohms and the amp runs at about 150 watts. If your extra cab is also 8 ohms, plugging into the Mag will result in about 300 watts into 4 ohms (the minimum) with 2 15's. That should be plenty for a church basement. The acoustics down there will be very boomy anyway as a result of the low ceiling. In such cases, I often need to back off the bass EQ, which requires less amp power.

If the Mag300 is just a head, all the above is still valid, if the cabs are both 8 ohms.

If the Mag speaker is 4 ohms, you are already running at 300 watts and the single 15 in speaker would still probably handle the room.

You don't mention the wattage of your GK head, but the Mag300, 1-15 at 150 watts and the GK with 1-15 will probably be about the same net power with a lot more complexity. I just would go with the 2 15's and the Mag300. Keep the two speaker cabs together and stack if possible for best room coverage. Otherwise, you might have bass nulls and overpowering bass in different locations in the room.

If either 15 incher is 4 ohms, you will need to power it with the GK head. Combining such speakers on one amp will result in too low impedence for the amps. Mismatched impedence speakers don't work well together anyway because too much power will go to the 4 ohm and not enough to the 8 ohm.

Forget about 2 amps and EQing them differently. Too much complexity and no one will notice anyway.

Sorry for the long-winded response. Just call me Tony Wright Jr. Love ya, Tony.

wborys
OldFartBassPlayerWalt

Robbinsville, NJ

what do you mean the bass is too loud?
Mar 1st, 2016 10:43 AM   Edit   Profile   Print Topic   Search Topic

Hey, thanks for the sage thoughts.
just a note, the impedences will add up
to 4 (2 8 ohm speakers), the min for my
Mag300 head.


themaestro
Contributing Member
**********
****

Wichita, Kansas

Drums = pulse, Bass = heartbeat
Mar 1st, 2016 11:50 AM   Edit   Profile   Print Topic   Search Topic

I would stack the two cabs, or at least put them side to side and don't separate, plug them both into the Mag and call it good. It should give you everything you need. Good luck with the show.


Tony Wright

Stillwater, OK

Built for comfort, not for speed.
Mar 6th, 2016 03:13 PM   Edit   Profile   Print Topic   Search Topic

maestro....don't think I didn't see that.

You were a little brief, but close enough to what I would have said...you could have gone more in depth to explain the coupling effect of side by side or stacked vs separated speaker cabinets.

themaestro
Contributing Member
**********
****

Wichita, Kansas

Drums = pulse, Bass = heartbeat
Mar 6th, 2016 08:50 PM   Edit   Profile   Print Topic   Search Topic

Tony, I said I was Tony Wright Jr, not THE Tony Wright.

Roly
Contributing Member
**********
*********

Whitehorse Canada

I don't get out much
Mar 7th, 2016 12:08 AM   Edit   Profile   Print Topic   Search Topic

Vertically aligned boxes disperse horizontally.

There is no guaranty that two different amps will output the signal in phase with each other.

FDP Forum / Performer's Corner / any reason NOT to use two bass amps (vs one amp, two speakers)?




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