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Discussion Starter #1
Ok currently I have two 12" Sony XS-L122P5 12" (350wrms @ 4ohms) hooked up to a 2 channel amp. Both are running 300wrms, heres the problem, the amp freq. range is from 40hz-150hz....which is horrible. So I'm thinking about getting a new amp which is the Sony XM-SD61X http://www.sonicelectronix.com/item_5027.html. My question is, will running the amp at 600w @ 2ohms see the 4 ohm subs and power each equally? I'll be wiring them in parallel, so that should work right? My other question is about my box, they are in a bandpass box which sounds pretty good, but I'm wondering if they were in a sealed box would it be better?
 

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1. The amp you currently have is putting out 300w to each sub?
2. What is wrong with a 40hz-150hz filter? I have never been a big fan at running subs too high even if they are rated to do so. I just don't care for the sound. I think my sub is cutoff around 90hz.
3. Yes, if you run the subs parallel they will result in a 2 ohm load (assuming the subs are single voice coil) which in turn will force the amp to run at 600w @ 2ohm / 2 giving 300w to each sub.

4. As far as the box goes, it depends a lot on what type of music you listen to and what you goal is. Sealed boxes require much more power to produce high spl ratings but also high much harder and rebound quicker. Ported boxes require less power to play loud but give more of a "boomier" sound. Rap and hip-hop sound good with these type of boxes. Bandpass combines the best of both but takes up much more space.


[Edited by mberry on Feb 23, 2006 4:15 AM]
 

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well, I Build 4th order bandpasses for competition, and they are designed to play at a single frequency, and i would never ever think of actually trying to play music on them. that's what a bandpass is really designed for. single freq or playing low and efficient with low power. 600 watts is not really low power if the amplifier you are thinking about getting is a true 600 watts rms. Post the brand.

i would put the sony's in a sealed enclosure, 1 cube each. you might sacrifice a little on the lower end, but they still should play down to 30 hz and up to 150 just fine. i would actually not set up the crossover at 150 tho, i like mine for my daily driver around 100.

there are exceptions, I know of a few world finals cars that have taken home a 1st place trophy with boxes designed to play up to 400 hz (not lately tho), and they provided the subs very low power, and would be lucky to hit a 130 db, so that's the tradeoff. (and yes, one i know of was a bandpass). So remember, what fits most people might not be what you are looking for.

just do sealed, upgrade your subs later on and go ported, there are plenty of good subs out there that are nice and tight in a ported enclosure.
 

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Discussion Starter #4
Yes the current amp is supposedly running each sub at 300w @ 4ohms. My complaint about the freq. range is on some songs the bass just cuts out and you can tell it sounds weird. Maybe its just the amp.... The new amp is the Sony XM-SD61X http://www.sonicelectronix.com/item_5027.html 50-300hz. I still want a boomy bass feel so I'm thinking of getting this http://www.sonicelectronix.com/item_1543.html or should I get http://www.sonicelectronix.com/item_1583.html

[Edited by phope on Feb 23, 2006 8:02 AM]
 
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