Mark Bass F Series (True Power Rating Help)

[neptunehealer]

Hello all.

I have been gigging with a Mark Bass F Series head (limited edition) for a couple of years now. In fact i bought it off here.

As i am now seeking to use it at 4 ohms i have entered the realms of needing to know it's maxcimum power output.

I have looked online and i can't find an official spec, just seen for sale adverts. People selling them say it's rated 250@8ohms and 450@4ohms.

I know it says 450W on the front of the head, but on the back of the head on a silver plate it says Power rating = 550W

So is my head 450@4ohms or 550@ohms?

Here's a pic of it to help you to help me.

http://www.google.co.uk/imgres?hl=en&client=firefox-a&hs=Mq&sa=X&tbo=d&rls=org.mozilla:en-GB:official&biw=1280&bih=707&tbm=isch&tbnid=xbq7HlBHEX8-nM:&imgrefurl=http://www.talkbass.com/forum/f8/anybody-using-bass-rig-completely-non-us-uk-918111/index2.html&docid=At2EyEbyvjR_0M&imgurl=http://medias.audiofanzine.com/images/normal/markbass-little-mark-f1-limited-edition-315346.jpg&w=3264&h=2448&ei=Ryj5UM2dMc2W0QXMqoD4Ag&zoom=1&iact=rc&dur=1&sig=109946944603662019504&page=1&tbnh=142&tbnw=186&start=0&ndsp=31&ved=1t:429,r:1,s:0,i:86&tx=71&ty=43

[obbm]

Why don't you just email Markbass and ask them?

[neptunehealer]

[quote name='obbm' timestamp='1358506497' post='1940359']
Why don't you just email Markbass and ask them?
[/quote]

Nice one, why didn't i actually think of that!!!

Thanks though.

[Telebass]

"People selling them say it's rated 250@8ohms and 450@4ohms"

Correct.

[ShaunB]

[size=4][font=arial, helvetica, sans-serif]...this guy seems to think:[/font][/size]

[size=4][font=arial, helvetica, sans-serif][url="http://www.kostis.net/en/private/bass.htm"]http://www.kostis.ne...rivate/bass.htm[/url][/font][/size]

[size=4][font=arial, helvetica, sans-serif]Scroll down: [color=#000000]450 W RMS at 4 Ohms, 280 W RMS at 8 Ohms, 2 RU, 8 kg[/color][/font][/size]

[size=4][font=arial, helvetica, sans-serif][color=#000000]Odd they don't show the a[/color]mp on their discontinued page...[/font][/size]

[size=4][font=arial, helvetica, sans-serif]...and [/font][/size]http://basschat.co.uk/topic/28253-sold-markbass-little-mark-450w-sold/

Edited January 18, 2013 by ShaunB

[mybass]

[quote name='neptunehealer' timestamp='1358506091' post='1940349']
Hello all.

I have been gigging with a Mark Bass F Series head (limited edition) for a couple of years now. In fact i bought it off here.

As i am now seeking to use it at 4 ohms i have entered the realms of needing to know it's maxcimum power output.

I have looked online and i can't find an official spec, just seen for sale adverts. People selling them say it's rated 250@8ohms and 450@4ohms.

I know it says 450W on the front of the head, but on the back of the head on a silver plate it says Power rating = 550W

So is my head 450@4ohms or 550@ohms?

Here's a pic of it to help you to help me.

[url="http://www.google.co.uk/imgres?hl=en&client=firefox-a&hs=Mq&sa=X&tbo=d&rls=org.mozilla:en-GB:official&biw=1280&bih=707&tbm=isch&tbnid=xbq7HlBHEX8-nM:&imgrefurl=http://www.talkbass.com/forum/f8/anybody-using-bass-rig-completely-non-us-uk-918111/index2.html&docid=At2EyEbyvjR_0M&imgurl=http://medias.audiofanzine.com/images/normal/markbass-little-mark-f1-limited-edition-315346.jpg&w=3264&h=2448&ei=Ryj5UM2dMc2W0QXMqoD4Ag&zoom=1&iact=rc&dur=1&sig=109946944603662019504&page=1&tbnh=142&tbnw=186&start=0&ndsp=31&ved=1t:429,r:1,s:0,i:86&tx=71&ty=43"]http://www.google.co...:86&tx=71&ty=43[/url]
[/quote]

I think the amps are 'moderately' rated a little below what they actually can put out.

[discreet]

In my experience, regardless of spec Markbass amp go loud!

[Musky]

The 550w stated on the back of the amp is the power consumption, not what the amp puts out to the speakers.

[andydye]

F500
http://www.markbass.it/product_detail.php?id=94

F1
http://www.markbass.it/product_detail.php?id=82

Is that them all?

Theyre both 500w at 4 ohm...?

[steve-bbb]

from a local amp tech here he tells me that speakers are rarely ever exactly 4 or 8 ohms so if you want accurate figure prob best to get somebody to throw multimeter at it maybe ??

[obbm]

[quote name='steve-bbb' timestamp='1358537927' post='1941206']
from a local amp tech here he tells me that speakers are rarely ever exactly 4 or 8 ohms so if you want accurate figure prob best to get somebody to throw multimeter at it maybe ??
[/quote]

Impedance varies with frequency and cannot be measured with a multimeter.

The pure resistance of a 4-ohm speaker will be in the order of 6-ohms.

[warwickhunt]

Not trying to be ar5ey but even the 100w difference between the lowest and highest ratings won't make a ha'peth of difference in the real world. The ratings on the cabs (regardless of make) will be just as vague/incorrect as the amps ratings and whether you are putting in 550w rather than 450w won't 'really' matter.

[Lozz196]

[quote name='discreet' timestamp='1358518886' post='1940695']
In my experience, regardless of spec Markbass amp go loud!
[/quote]

Yep, loud at 8ohms, and a bit louder at 4ohms should be their spec

[Telebass]

[quote name='warwickhunt' timestamp='1358538448' post='1941217']
Not trying to be ar5ey but even the 100w difference between the lowest and highest ratings won't make a ha'peth of difference in the real world. The ratings on the cabs (regardless of make) will be just as vague/incorrect as the amps ratings and whether you are putting in 550w rather than 450w won't 'really' matter.
[/quote]
Perzakly.

[Telebass]

[quote name='warwickhunt' timestamp='1358538448' post='1941217']
Not trying to be ar5ey but even the 100w difference between the lowest and highest ratings won't make a ha'peth of difference in the real world. The ratings on the cabs (regardless of make) will be just as vague/incorrect as the amps ratings and whether you are putting in 550w rather than 450w won't 'really' matter.
[/quote]
Perzakly.