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Old 14th February 2013, 11:29 PM   #71
NEO Dan is offline NEO Dan  United States
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Quote:
Originally Posted by maxo View Post
Dan,
would my power amp in 4 ohms maybe actually like 3
because of the driver not being 8 ohms
To answer the question:
One pair 15HP1030-8 (-8 for 8 ohm) on your amp bridged seems like a great match IMO.
The DC resistance = RE is not the actual load the amp sees in operation. The load presented by the drivers varies with frequency and should not be a problem for the amp as long as you are operating within the amplifiers nominal rated load.
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Old 15th February 2013, 02:24 PM   #72
maxo is offline maxo  United States
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can the 18tbw100 would be ok at the expense of 200 watts rms and ferrite magnet
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Old 15th February 2013, 02:39 PM   #73
NEO Dan is offline NEO Dan  United States
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Quote:
Originally Posted by maxo View Post
can the 18tbw100 would be ok at the expense of 200 watts rms and ferrite magnet
Unless you are using 4 ohm drivers and one amp bridged per cabinet it's not necessary to go 18", I can't speak for the performance of the TBW.
However I have used the 18SW115-4 and 15HP1030-8 in the same cabinets using an adapter ring so I know how that works out.
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Old 15th February 2013, 02:49 PM   #74
maxo is offline maxo  United States
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Quote:
Originally Posted by NEO Dan View Post
Unless you are using 4 ohm drivers and one amp bridged per cabinet it's not necessary to go 18", I can't speak for the performance of the TBW.
However I have used the 18SW115-4 and 15HP1030-8 in the same cabinets using an adapter ring so I know how that works out.
i think i can get 299 - 350 bucks driver but not past the 400 mark
so i will get one 1st then the other
now, any big advantage of filling the cabinet with an 18 instead of a 15
the BC 15TBX100 have a nice price

next thing after my cabs build is to get an xls drivecore 2500
and use it in bridge mode to feed 2 8 ohm cabs , it is rated at 2400 watts 4 ohms bridged
i am always looking for second hand baragains

Last edited by maxo; 15th February 2013 at 02:55 PM.
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Old 15th February 2013, 04:20 PM   #75
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Quote:
Originally Posted by maxo View Post
can the 18tbw100 would be ok at the expense of 200 watts rms and ferrite magnet
The difference between 1500 and 1700 watts is less than a dB.
The BC18TBW100 specs are almost the same as the BC18SW115.
With the cost of the BC18SW115 having gone up so high, I'd definitely choose the BC18TBW100 now.
The weight difference between the drivers is not much compared to the total weight of the cabinet.
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Old 15th February 2013, 05:02 PM   #76
NEO Dan is offline NEO Dan  United States
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18" TBW is not strong enough, it's going to roll over and play dead <50Hz

In order of preference
15TBX100
15HP1030
15TBW100
18SW115
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Old 15th February 2013, 06:11 PM   #77
tb46 is offline tb46  United States
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Hi NEO Dan,

"...18" TBW is not strong enough, it's going to roll over and play dead <50Hz..."

Would you mind explaining the rational for that statement?

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Old 15th February 2013, 06:14 PM   #78
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Quote:
Originally Posted by NEO Dan View Post
18" TBW is not strong enough, it's going to roll over and play dead <50Hz
Dan,

BL of the B&C18TBW100 is only about 13% less than the B&C18SW115, commensurate with the lesser Xmax/Xvar.
This thread has talked about so many cabinets I no longer know which you are talking about, but in the Keystone design the B&C18TBW100-8 response looks OK to me in the Hornresp simulation.

Although the Hornresp sim is not identical to the actual Keystone frequency response, you can see the B&C18TBW100-8 at half the power (reaching 13mm excursion) is basically within 3 dB output of the B&C18SW115-4 at 15mm excursion.

For a bit more than half the present cost of the B&C18SW115, the B&C18TBW100 looks like a good choice to me.

Art
Attached Images
File Type: png BC18SW115, BC18TBW100.png (454.9 KB, 48 views)
File Type: png BC18SW115.png (455.9 KB, 46 views)
File Type: png BC18TBW100.png (426.4 KB, 36 views)
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Old 15th February 2013, 06:52 PM   #79
maxo is offline maxo  United States
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hope i haven't opened a can of worms here
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Old 15th February 2013, 09:48 PM   #80
NEO Dan is offline NEO Dan  United States
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Quote:
Originally Posted by maxo View Post
hope i haven't opened a can of worms here
Not for me. I have worked to build horns that exactly match My TH18 variant Hornresp expansion, including cone correction and path length correction for 2 pi loading so the electrical and acoustic measurements closely correlate with the Hornresp.

Art knows the Hornresp does not match the horn. I don't think Art would intentionally build a horn with a dip. At any rate I am confident the Keystone is good, in fact I am curious to build one and measure it. Having the spare $$$ to heat the shop for a couple days and decent ply are a factor.
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