I need to rebuild sub, need some opinions. - AVS Forum
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Old 01-28-2008, 09:19 AM - Thread Starter
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I recently blew my old Tempest now it is time to do a new one. I was thinking of the Tempest X. Should I get a new amp too. I currently have Crest Audio LA 901. Would I be fine with the Behringer - EP1500. Does this amp have subsonic filter, or should I buy something separate for that. Thanks for all opinions.
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Old 01-28-2008, 04:08 PM
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Do you have a budget to follow? Max enclosure size?

You should have a device with a filter to roll off the lows below tuning. You might consider something like the Crown XTI amps, that feature built in EQ, without need for an outboard device.

Selling your current amp might put some coin in your pocket towards a new subwoofer / enclosure / amp package.

"You take the blue pill - the story ends, you wake up in your bed and believe whatever you want to believe. You take the red pill - you stay in Wonderland and I show you how deep the rabbit-hole goes."
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Old 01-28-2008, 07:45 PM - Thread Starter
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Quote:
Originally Posted by rudy2112 View Post

I recently blew my old Tempest now it is time to do a new one. I was thinking of the Tempest X. Should I get a new amp too. I currently have Crest Audio LA 901. Would I be fine with the Behringer - EP1500. Does this amp have subsonic filter, or should I buy something separate for that. Thanks for all opinions.

I am going to try and sell some equipment on ebay, I have some Adcom, & Rotel seperate components. I was hoping to keep the budget around $600 for sub, and amp.
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Old 01-28-2008, 11:30 PM
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I googled your amp, it seems that it is not rated for a 4 ohm load in bridged mono, only stable to 8 ohms.

Not so sure it would like driving the CSS SDX-15, but it would be worth a try. (http://www.creativesound.ca/details.php?model=SDX15

You could always wire both coils of the SDX-15 in series, and put the amp in stereo, use only one channel.... this would give you 300 watts to it.

That would eat up almost half of your budget there.... and if you need a subsonic filter, you could use a few different devices. Crown XTI with built in DSP.... ( blew your budget ) Behringer FBD, or a Behringer DCX 2496. ( with your existing amp )

Crown XTI 1000 if you can stretch the budget gives you flexible DSP, and 1400 watts into a 4 ohm load in mono. $ 500 at Parts Express, and less other places. ( fleaBay, etc other resellers )
http://www.partsexpress.com/pe/showd...number=245-435

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Old 01-29-2008, 12:24 AM
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Anyone know if the DSP in the Crown will get down low say ~10hz for the subsonic or eq?


Thanks
Dan

Regards,
Dan
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Old 01-29-2008, 01:46 AM
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I don't know about how low the Crown DSP goes, I assume 20 hz. I would not tune a single 15" below about 18 hz or so, the reason being is increased excursion above tuning, and increased amounts of IMD distortion resulting from large diaprhagm displacements.

Also, with limited displacement down low ( cone area ) why would you bother with a slight sensory improvement down low at the expense of higher distortion above tuning?

If he killed the original tempest driver, he was WAY exceeding xmax, until the spider physically stretched tight. He either needs: to turn it down, get more cone area, and/or ensure that there is an appropriate filter installed.

Having a low cut filter at 20 with a final tune of 18-19 is not that much detrimental, it will definately protect the driver from excessive excursions down low, and you can also add a tad bit of boost down at 20 as well.

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Old 01-29-2008, 08:23 AM - Thread Starter
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Quote:
Originally Posted by michael hurd View Post

I googled your amp, it seems that it is not rated for a 4 ohm load in bridged mono, only stable to 8 ohms.

Not so sure it would like driving the CSS SDX-15, but it would be worth a try. (http://www.creativesound.ca/details.php?model=SDX15

You could always wire both coils of the SDX-15 in series, and put the amp in stereo, use only one channel.... this would give you 300 watts to it.

That would eat up almost half of your budget there.... and if you need a subsonic filter, you could use a few different devices. Crown XTI with built in DSP.... ( blew your budget ) Behringer FBD, or a Behringer DCX 2496. ( with your existing amp )

Crown XTI 1000 if you can stretch the budget gives you flexible DSP, and 1400 watts into a 4 ohm load in mono. $ 500 at Parts Express, and less other places. ( fleaBay, etc other resellers )
http://www.partsexpress.com/pe/showd...number=245-435

Is that sub better than the Tempest X? I dont want to sell myself short. If I have to wait a little longer so I can afford to do the right thing, thats what I will do. I am open for all suggestions.
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Old 02-16-2008, 10:02 PM - Thread Starter
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Hey guys, I finally sold off some extra equipment. My budget is now about $1,000 - $1,200. What equipment should I buy. I have a pretty large room to fill. Max enclosure size is about 16 cubic feet. I am going to build the box and stick it in a closet (have it hidden), cut a 16" x 16" hole in the wall, and cover it with a cold air return vent. Price does not need to include building materials.
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Old 02-16-2008, 10:20 PM
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The filter/crossover frequencies in the DSP on the Crown XTI series can only be set between 20 Hz and 20 kHz.
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