Require approx output from this Driver please?

Discussion in 'Home Theater Projects' started by Richard_M, Jul 19, 2003.

  1. Richard_M

    Richard_M Second Unit

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    Would one of you kind experts let me know what I could expect as an output low freq range & spl from this Driver & amp.

    It is mounted in 160L reflex enclosure.

    It has a Redgum RGSW2 HL amp built in.

    These are some of the specs

    Thick aluminium sand cast frame

    Straight profile Polyglass cone, foam surround

    Edgewound flat copper wire 77 mm voice coil, black aluminium former

    Efficiency : 93.9 dB

    Nominal Power 225w

    Program power 300w

    Sensitivity 93.9

    Cone Polyglass

    Surround Foam

    Fs 23.7

    Vas 380.5

    Qts 0.29

    Qes 0.32

    Qms 2.65

    I realise this is probably a tall question, but just a rough idea would be great.

    Regards,

    Richard
     
  2. TimForman

    TimForman Supporting Actor

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    Looks like 90 db at 33.5 Hz (approx)and you'll probably pick up some with room gain. It'll definitly get loud and low.
     
  3. Isaac C

    Isaac C Stunt Coordinator

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    Xmax is pretty low and Fs is relatively higher compared to most "home" drivers. How much is this driver unit? I'd recommend an Adire Audio Shiva instead, which has more Xmax, better bass extension given only a (smaller) 142.5-litre vented-box @ 16Hz-18Hz and it'll play louder too. The authorized distributor of Adire Audio products is Acoustic Concepts and it is in Melbourne [​IMG]
     
  4. Richard_M

    Richard_M Second Unit

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    Thanks guys for the replys.

    Isaac,

    The sub is built by John from Acoustic Concepts, and the driver is the same one that is used in the Osbourne subs.

    I had a listen to the unit yesterday, and felt that there was very little in the way of mid bass. But in saying that I do not know how the rest of the system was configured, or if the levels were set right. What also made it difficult was that they did not have a multi region DVD player or the ability to play DTS, so all the reference material I took along I could not use. The sub is in exellent condition and they are asking $1800.00.

    This is why I am trying to get a feel for the output, it stands about 1mtr tall and is 500x500mm square made out of 33mm MDF with 2x ports approx 3in not sure about that.

    I guess I am wanting to know if it is a worthwhile investment, or should I put my money towards a better unit.

    Thanks

    Richard
     
  5. TimForman

    TimForman Supporting Actor

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    $1800!!! I think I could build 4 powered Tempest or AV15 (or ?) subs for that. I should qualify my numbers by saying that was the Hz at 90 db which is near normal operating volume IMO. It was quite a bit louder above that Hz which makes me think this is more suited to Pro audio than the home. Personally, I'd rather have multiple subs than one giant one.
     
  6. Richard_M

    Richard_M Second Unit

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    Thanks Tim,

    I take it from what you are saying that this unit is more designed for Pro use, and that it does not go sub 20hz with good output?

    I have decided not to buy the unit, but I guess I am just being inquisitive.

    Richard
     
  7. TimForman

    TimForman Supporting Actor

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    That's the way it looks. For example, the Adire Tempest won't play as loud but it'll go 10 Hz lower. If you're in your home I think you'll be more interested in good low response than sheer SPL. Also, I forgot to convert AUS dollars. 1800 is close to 900 here. Still, I could build two or three killer subs that combined would outperform the single Focal and give you more even in-room response.
     
  8. Dan Hine

    Dan Hine Screenwriter

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  9. warrick

    warrick Stunt Coordinator

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  10. TimForman

    TimForman Supporting Actor

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