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lukeamdman

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Posts posted by lukeamdman

  6. Luke's basic amplifier tests

    in Bass Gear

    Posted

    In other amplifier news, SpeakerPower is under new management since Brian has retired.  Retail prices appear to have increased as well.  

     

    http://www.speakerpower.net/about-us.html

     

    "CEO's Message

    Welcome,

    I am Justin Ryan, CEO of SpeakerPower.  In 2018, I acquired SpeakerPower from its founder, Brian Oppegaard, upon his retirement.  I am very excited to continue the growth and development of SpeakerPower.  As an experienced executive in a variety of industries, and an MIT trained engineer, I know what it takes to develop exciting new products that satisfy the most demanding requirements of customers for their cutting edge products.  With further investment in new products, I plan to build on SpeakerPower's 16 year track record of delivering high quality, powerful, efficient, and intelligent amplifiers.

    For OEM manufacturers in Professional and Home Theater markets, SpeakerPower provides the opportunity to have next-generation intelligent amplifiers in your self-powered loudspeaker line. Our complete turn-key approach means that it is as easy for you to install a SpeakerPower amplifier in your cabinet as a woofer, horn or compression driver. With our proven designs, you will be up and running quickly with minimal up-front investment. And our state-of-the-art digital signal processing and power technology will reinforce your image as a technological leader.  With designs from 200 to 12,000 watts, we can meet your most critical needs.

    Users of SpeakerPower amplifiers enjoy high power and high efficiency, with intelligence designed to ensure continuous output in the most demanding applications.  Our products are manufactured and supported right here in California.  Our commitment to quality, technological acuity, and steadfast product support means your loudspeakers are powered with confidence. See what we can do for you today.

    Justin Ryan
    CEO"

    • Like 1

  8. Horn length extension on Othorns?

    in Bass Gear

    Posted

    13 hours ago, StainlessSteve said:

    Without room gain eight of those cabinets would be able to hit 153dB at 40hz according to Ricci's measurements, with room-gain that would be even more. I would love to see some measurements! Lukeamdman hit 152dB at the listening position with eight ported Incriminator Audio Judge 21 and two Ipal 21" Othorns. And if anything else beats that (besides Tom's sonic boom generator) it might be popalock's 32 sealed 18"s and two sealed 24"s or Leons who built eight ported HS-24"s alongside his four LAB subs.

    When pennynike1 had (2) Othorns + (4) Terraforms I measured 135db in his room, so +12db going from 2 Othorns to 8.  

    I've hit 148db RMS and 154db peak in my room at the LP and I still haven't clipped the three SP2-12k amps.  

     

  23. The Low Frequency Content Thread (films, games, music, etc)

    in Bass Content

    Posted

    Do we know what scene has that huge amount of <5Hz content? It would be a very rare system indeed that can do anything with it. Even with a BIG sealed system, transducers or IB the typical electronics roll off chain is going to be way down in level below 5Hz. Probably a good thing too cause look at the peak level on that at 1Hz!

     

     

    *awaits Bosso's feedback* 

     

    lol

     

    Doesn't the dragon crash at the end of HTTYD have a lot of <5hz?

  24. Luke's basic amplifier tests

    in Bass Gear

    Posted

    I read that article many years ago, and in some cases, it can be applicable. Keep in mind that you are also driving essentially a dummy resistor load, and the results may be different driving a reactive load, where back EMF is reflected on the power supply.

     

    I'm sure someone could find an application for this, but the more I think about it the less it seems worth the hassle.  Wouldn't it be easier to series the load and use the amp in bridged mode like you normally would, and skip the parallel inputs and reversing the polarity on one of the outputs?  

     

    Even in the best case scenario of a 15% gain, we're talking about a fraction of a single dB of gain.  

  25. Luke's basic amplifier tests

    in Bass Gear

    Posted

    I was asked to test this over 2 months ago but I've been a huge slacker:

     

    http://www.prosoundweb.com/topics/sound_reinforcement/fighting_for_power_a_way_for_amplifiers_to_increase_actual_power_delivered_/

     

    The basic theory is that if an amp is driven in stereo and both channels are producing the exact same signal, both channels are also drawing current from the power supply at the exact same time/interval.  The author of the article claims that if you parallel the inputs but flip the polarity on the input of one of the channels, causing the sine waves from each channel to be exact opposites, the channels are now "taking turns" drawing current from the power supply.  

     

    For these tests I used a CC4000, wired my test rig for 3.4ohm per channel, and used a 30hz sine wave for a duration of 2 seconds.  I pushed the amp as far as it could go while still producing a clean sine wave.    

     

    For test #1, I used an XLR y-splitter cable to parallel the same signal to the inputs and the amp was in stereo mode.  

     

    For test #2, I put the amp in bridged mode and didn't make any changes to any cabling.  According to the article, all this switch does is reverse the polarity going to the B channel of the amp.

     

     

    Results:

     

    Capture_zpstdxoniqp.png

     

     

    Test #1:

     

    DS1Z_QuickPrint3_zpsm9um0dtq.png

     

     

    Test #2:

     

    DS1Z_QuickPrint4_zpsvlpuz4zr.png

     

     

     

     

    Really no difference at all, certainly not the 5-15% increase claimed in the article.  In fact, I think test #2 has slightly more distortion in the wave form when pushed to the same 190Vpp.

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