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Old 12th May 2009, 02:23 AM   #1
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Default sub amp question for MJK open baffle

I am building the Hframes now for the 18" goldwood (wow is it big!). I plan on using a plate amplifier from Parts Express to power it along with a simple se amp from tubelab for the full range driver.
I will be using one plate amplifier per speaker (one for R , one for L)
My question is: if I use one interconnect to each plate amp, am I utilizing only half of its amplifer section? Should I use a Y connector on the interconnect to get my pre amp to drive both sections of the plate amp, or will I drive both sections of the plate amp by just connecting it to one (R) or (L) of the plate amp

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paul
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Old 12th May 2009, 02:42 AM   #2
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What model plate amp?
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Old 12th May 2009, 02:02 PM   #3
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Some amps will bridge if you use the R only but why not just get Y connectors?
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Old 12th May 2009, 02:17 PM   #4
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I thought it would look nicer without the Y connector.
It is the 100 W Dayton audio model
I thought as I'm using two of them 100 watts would be enough.
Also, my SET amp will only put out about 8 watts, albeit on significantly higher sensitivity full range drivers.
Paul
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Old 12th May 2009, 02:51 PM   #5
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That amp like most sums the signal to a mono so whether you run one channel in or divide it into two before it sums them shouldn't matter. Me, I like the symmetry of seeing both inputs filled so I would use a Y just because it looks better, not worse.
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Old 12th May 2009, 07:53 PM   #6
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Default U frame, power question

Hi there Cal: I am constructing a U frame with a 15-inch driver, closley matching a Martin King example (24-inches long, area = 1.3xSd, Qts=.927), and since Martin King has impounded the Mathcadd work sheets, I'm without information on the power needed. I have a 100watts per channel amplifier available and hope to reach 98db at 27Hz (low note on the piano), which will also cover the orchestrial bass instruments at 31hz (Bb). I plan on crossing over at 70hz. Is this a safe and plasuable plan?

T/S parameters supplied with the sub for 8 ohms: Fs=25hz, Qts=0.927, Qms=6.498, Qes=1.081, Vas=6.81cf, Xmax=6.3mm, Le=7.2, Le=2.56, SPL=95db (probabily at 1000Hz), Bl=15.22, 700wrms, Vc is a DVC connected in series for 8 ohms imp.
....regards, Michael
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Old 12th May 2009, 08:18 PM   #7
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Hello Michael,

Not wishing to rain on anyone's parade but I'm not sure you're headed in the right direction with that combo. I am thinking it's a small motor driver, not really a subwoofer and to expect 27Hz from it is asking a lot.

Also, this is hijacking pforeman's thread so may I suggest you start a new thread and we can deal with it there?

Thanks.
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Old 15th May 2009, 07:19 PM   #8
brookbh is offline brookbh  United States
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Could you get some pics on how you wire up the h-frames?
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