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  1. #1
    Junior Member
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    external battery pack for a mobile Boom

    Hi,

    as the power supply is external, I was thinking about adding a 12V battery pack under the box, with a loader, but that would add 2 Kg to the box, so probably not a good idea. Suggestions ? 2-3 hours autonomy in the garden would be cool !

    Charles

  2. #2
    Senior Member Mnyb's Avatar
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    I wished there were batteries in it from the beginning for similar reasons.
    Nimh cells dont need to be that heavy.

  3. #3
    Senior Member iPhone's Avatar
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    Quote Originally Posted by cbueche View Post
    Hi,

    as the power supply is external, I was thinking about adding a 12V battery pack under the box, with a loader, but that would add 2 Kg to the box, so probably not a good idea. Suggestions ? 2-3 hours autonomy in the garden would be cool !

    Charles
    A 18VDC Dewalt cordless rechargeable battery will give you a good 3 hours. Maybe even 4 hours depending on WiFi signal level and volume level.
    iPhone
    Media Room:
    ModWright Platinum Signature Transporter, VTL TL-6.5 Signature Pre-Amp, Ayre MX-R Mono's, VeraStarr 6.4SE 6-channel Amp, Vandersteen Speakers: Quatro Wood Mains, VCC-5 Reference Center, four VSM-1 Signatures, Video: Runco RS 900 CineWide AutoScope 2.35:1, Vandersteen V2W Subwoofer

    Living Room:
    Transporter, ADCOM GTP-870HD, Cinepro 3K6SE III Gold, Vandersteen Model 3A Signature, Two 2Wq subs, VCC-2, Two VSM-1

    Office: Touch with Vandersteen VSM-1s
    Kitchen: Touch in-wall mount w/ Thiel Powerpoint 1.2s
    Bedroom: Squeezebox BOOM
    Bathroom: Squeezebox Radio
    Around the House: SliMP3, SB1, SB2, SB3
    Ford Thunderbird: SB Touch, USB drive
    Ford Expedition: SB Touch, USB drive

  4. #4
    Gadfly, Former Founder Slim Devices dean's Avatar
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    external battery pack for a mobile Boom

    On Aug 29, 2008, at 8:50 AM, iPhone wrote:
    > A 18VDC Dewalt cordless rechargeable battery will give you a good 3
    > hours. Maybe even 4 hours depending on WiFi signal level and volume
    > level.


    Using something besides the included power supply is definitely not
    supported at this time, will void your warrantee, may cause a fire and
    bring a pox upon your house.

    That said, Boom operates more efficiently at 12v, using an 18v battery
    will just give off more heat.



  5. #5
    Senior Member
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    Since its power usage seems to be on the order of 8 watts or less, this should be easy. A stack of 8 good NIMH AA's should give you about 2 hrs. If you want to go all the way to D's (expensive) you're up to about 11+ hrs. Hook up a pack of them with the right connector and you're in business.

    Since it's so simple, shouldn't Slim Devices consider offering the pack themselves as an accessory?

  6. #6
    Senior Member Michaelwagner's Avatar
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    Quote Originally Posted by lanierb View Post
    Since its power usage seems to be on the order of 8 watts or less
    Idle power usage.

    The power specs say 1A minimum @ 12V, so the supply must be able to provide at least 12Watts for when the box is on and playing music.

  7. #7
    Logitech Squeezebox Employee
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    external battery pack for a mobile Boom

    On 8/30/08, Michaelwagner <
    Michaelwagner.3exufb1220070003 (AT) ...limdevices.com> wrote:
    >
    >
    > lanierb;333918 Wrote:
    > > Since its power usage seems to be on the order of 8 watts or less

    > Idle power usage.
    >
    > The power specs say 1A minimum @ 12V, so the supply must be able to
    > provide at least 12Watts for when the box is on and playing music.



    Hmmm, where does it say that? Because it's wrong. The system is designed
    for a 2.5A (30 watt) supply. Below 75% volume or so, power
    consumption doesn't change much playing or not playing -- it's about 6
    watts.

    When you're cranked up to 100%, the average consumption goes up by a couple
    of watts.

    This is because of 2 different factors:
    1) volume that we hear is roughly logarithmic with power. (i.e. dB = 10
    * log10(power)). .1 watts is only 10 dB quieter than 1 watt.
    2) music is very 'peaky'. The difference between the average (RMS) power
    and peak is about 15. 30 watts is only for the very peaks of the music, so
    RMS power increase would be 30/15 = 2 watts over the standby power.

    -Caleb


  8. #8
    Senior Member Michaelwagner's Avatar
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    You know, Cal, I wondered about that. Hard to get 30 watts out from 12 watts in.

    I'll show you mine if you show me yours.

    Here's where it says 12 watts. Well, it doesn't say 12 watts, it says 1A@12V
    http://www.slimdevices.com/pi_boom.html#power
    Power input
    12V DC, regulated
    Center positive, sleeve ground
    Connector: 2.5mm ID, 5.5mm OD, 11mm long
    Min supply rating: 1000mA
    Now show me yours. Where in that whole document does it say 30 Watt audio?

  9. #9
    Gadfly, Former Founder Slim Devices dean's Avatar
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    external battery pack for a mobile Boom

    You are absolutely right, that's confusing. We'll take it off.

    On Aug 30, 2008, at 4:53 AM, Michaelwagner wrote:

    >
    > You know, Cal, I wondered about that. Hard to get 30 watts out from 12
    > watts in.
    >
    > I'll show you mine if you show me yours.
    >
    > Here's where it says 12 watts. Well, it doesn't say 12 watts, it says
    > 1A@12V
    > http://www.slimdevices.com/pi_boom.html#power
    >> Power input
    >> 12V DC, regulated
    >> Center positive, sleeve ground
    >> Connector: 2.5mm ID, 5.5mm OD, 11mm long
    >> Min supply rating: 1000mA


  10. #10
    Senior Member Michaelwagner's Avatar
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    I never compared it to mine, because I know the betas shipped with the "wrong" power supply anyways.

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