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[Antone Atmarama Bajor]

     I was just looking for any recommendations on a good plate amp manufacturers.  I have used the 1000 Watt parts express Class G/H Subwoofer Amp.  I'm not entirely sure why they claim it is a subwoofer amp as the High pass sets in around 25Hz.

    I would like to find any class plate amp in the 1KW range that doesn't High Pass above say 10Hz.

    Also I was wondering if anyone here knows which manufacturers (not necessarily plate amps) make amps that really control the cone (excellent damping).

    I noticed that an AB amp I was testing a sub with owned the driver when it was plugged in.  I could flick the cone and it was inert.  When the amp was unplugged  I could flick the cone and the thing pinged like a son of a bitch.

    Who else makes amps with such good common mode rejection for subs.

Antone-

   

[Dave Rickard]

Antone Atmarama Bajor wrote on Sun, 17 December 2006 16:09

I was just looking for any recommendations on a good plate amp manufacturers.  I have used the 1000 Watt parts express Class G/H Subwoofer Amp.  I'm not entirely sure why they claim it is a subwoofer amp as the High pass sets in around 25Hz.     I would like to find any class plate amp in the 1KW range that doesn't High Pass above say 10Hz.

Parts Express is pretty good about sharing modifications with customers.  Ask them how to modify the HP to 10 Hz.

Or ask on their "tech talk" board.  Helpful bunch over there, too.

[Antone Atmarama Bajor]

Cool Thanks!!

Antone-

[Mike Butler (media)]

Antone Atmarama Bajor wrote on Sun, 17 December 2006 18:09

... I'm not entirely sure why they claim it is a subwoofer amp as the High pass sets in around 25Hz....

You ARE kidding, right? Have you looked at some of the frequency ranges of the top-rated subwoofers? Why anyone would want to waste power at frequencies below what will be used is a mystery.

Check it out:
http://srforums.prosoundweb.com/index.php/t/20431/12138/

[Antone Atmarama Bajor]

 Uhhhm Because my BS-212 Sub (using lab 12 drivers) Has strong output down to 20Hz with single digit and lower distortion levels (up to 118dB RMS @ 20Hz).

    I have also built some sealed subs with the Lab 12 driver that are good for mid and near field applications.  4 Lab 12 drivers are capable of 110dB RMS @ 20Hz in a sealed sub that is ~4cu'.

   I wouldn't need any lower extension for an average PA cab.

Why would I want a "sub woofer" plate amp to high pass higher than my cabs reproduction capabilities.

Antone-

[Tim Duffin]

Antone Atmarama Bajor wrote on Sat, 03 February 2007 08:11

Uhhhm Because my BS-212 Sub (using lab 12 drivers) Has strong output down to 20Hz with single digit and lower distortion levels (up to 118dB RMS @ 20Hz).     I have also built some sealed subs with the Lab 12 driver that are good for mid and near field applications.  4 Lab 12 drivers are capable of 110dB RMS @ 20Hz in a sealed sub that is ~4cu'.    I wouldn't need any lower extension for an average PA cab. Why would I want a "sub woofer" plate amp to high pass higher than my cabs reproduction capabilities. Antone-

Well, depending on who you ask-- 118db at any low frequency isn't "strong" or even worth listening to in a concert with 6000 screaming people in front of the stage.  It seems to me that many of the requirements you are asking for would only work well in a home audio or audiophile hobbyist environment.  Most pro-audio products are designed to be loud and make money-- other requirements (like yours) are secondary and relate more closely to what a hobbyist would like.

T

[Pascal Pincosy]

Hi Antone,

I could probably get you an ICEpower amp from B&O if you want one. Take a look at the available wattages and let me know what model you want.

[Mike Pyle]

Pascal,

Do you have a link you could share for descriptions and specs of those amps?

Thanks.

[Ales Dravinec 'Alex']

Mike Pyle wrote on Wed, 07 February 2007 18:12

Pascal, Do you have a link you could share for descriptions and specs of those amps? Thanks.

http://www.icepower.bang-olufsen.com/sw2013.asp

A

[Antone Atmarama Bajor]

     For small gigs and a personal bass rig, I'm getting ~ 122dB @ 27.5Hz  Thats not insignificant.  I never said the rig was for 6000 people.  If I was doing that size gig there is only one practical choice for 20Hz output that I know of and quite a lot of them would be necassary.

    Less than 118dB @ 20Hz is enough to make the roll up doors in our warehouse rattle and make the windows in the loft osscilate violently, as well as the floor.

    The Sealed subs would be for a similar purpose, or near/midfield monitoring.  110dB @ 20Hz is not insignifican't  insignificant quite impressive for something that is a mear 4cu' sealed sub.

    Are you of the oppinion that if Clean undistorted 20Hz isn't available at SPLS greater than XdB that its useless to allow the sub to go that low.

   I figure If I'm an order of magnitude or two above the threshold of hearing then I'm doing Ok.

    It would be nice to have enough headroom that low to implement some sort of Equal Loudness curve, A little more easy to acomplish on a small scale.  Not in a 6000 person PA  Unless your DEATHCLOCK!!!!! and happen to be the 12th largest economy in the world.

    Who says I'm not a hobbiest.

    I'm thinking that a 28 X 28 X 14  4X Lab 12 linkwitz transform cab with at least 2kW of amp behind it would be a Sweet 5 string bass rig Sub, Syth Sub, Home theater sub, or studio sub.  110dB @ 20Hz may not be PA worthy but Its about all you can expect out of something so small.

    Anyhow all that said, and were off track.  I guess my point is most pro Amps Don't Highpass until 5-10Hz, why would an amp designed as a "Subwoofer amp have a builtin high pass around 25Hz????

Antone-