OK i decided to build a custom box for my 2 alpine type R 10" dual voice coil subs. i want these guys to hit as hard as they can. i already bought the medium density board to build the box but i have several questions about what type of box is best. alpine lists specs for a sealed inclosure but not for a ported. at least that i could find. and what would give them more powerful sound i want them to hit as hard as they can... also i read somewhere tonight about covering the inside of the box with dapening material(dynamat) for better sound. this seems a little counter productive to me but thought i would ask about it. btw if a ported enclosure would be better where should i get the specs for one?
Replies (7)
Swez on 09/3/2003 06:45:08
I can only find specs on sealed enclosure volume for Alpine SWR subs as well.
http://ecominet2.alpine-usa.com/pls/admn/item_info?p_item_name=SWR-1041D&p_category=70&p_subcategory=150&p_main=10&p_more=y
Recommended Box Types : Sealed/Vented/Bandpass
Recommended Sealed Box Volume : 0.55 – 0.8 cu. ft.
You may have to write to Alpine Tech Services for details on ported enclosure recommendations.
Also, this sub come in a 2+2 & 4+4 ohm DVC configuration. Do you have an amp yet? If so, what do you have or plan to use to power these subs?
Swez
uochronos on 09/3/2003 07:15:20
they are the 4ohm + 4ohm. and i'm running them on a phoenix gold tantrum series amp 500.2 bridged and its puting out 500watts i'm running the subs in a sealed generic R/T box. its reasonably close to the cubic feet recomended. but i think they would sound 100% better in a box that was built for them
Swez on 09/3/2003 07:19:42
Maybe, maybe not.... you have about 10% leway here in sub enclosures. R/T makes a fair box and very cheap $$ too.
Do you know the cf/chamber for each sub? Also, what is the RMS output of this amp @ 2 ohms/ch?
Swez
uochronos on 09/3/2003 07:23:39
not sure exactly what the chamber size is in the box i told them to give me what ever they had that was closest(dumb of me not to ask) they said the box was pretty close but they recomended a custom one(from them so it may have just been them wanting more money) and the amp is a 125watt x2 channels at 4ohm 250 watt x2 channels at 2 ohm and 500watts x1 channel at 4 ohms. phoenix golds web site does say this though IASCA power rating 50watts/RMS x2 and 12.5volts not sure what IASCA is btw... also a little off topic here but my paper work that came with my amp says its stable down to 2ohms bridged is it a bad idea to run it that low though? and would i get alot more power?
Swez on 09/3/2003 07:34:29
Very unusual to have a 2 channel (Class A/B) amp that is 2 ohms stable in MONO bridged mode. It may get a bit hotter if you did try this. I doubt you will get more power from this amp @ 2 ohms bridged. If it did, the specs would reflect same.
The safe way to get max power from this amp is to run each channel 2 ohms (1 sub in parallel) to each channel is easiest way.
About your present enclosure, do you have the H,W & D dimensions on it? I can roughly calculate the cf internal based on that. Does it have a center divider panel as well?
Swez
uochronos on 09/3/2003 07:40:58
I would get more power out of the amp running each sub off one channel then with it bridged and both subs in hooked to that one channel? the box measures 13"x11"x30" it does have a center divider.. also the side thats 11 slants at and angle and the low side of that angle is 9"
Swez on 09/3/2003 11:52:03
I am guestimating this encosure is roughly 0.66 - 0.70 cf per chamber and not bad for your subs. Right in the middle.
Best power is either way you mentioned... just a lot easier to wire DVC's to a 2 channel amp as I mentioned earlier. Either way, 2 channels @ 2 ohms = 250 RMS per sub OR both subs wired for a 4 ohm load, amp bridged MONO = 500 RMS/2 subs = 250/sub.
If you want to make the subs louder, ported will net ~+3 to +5dB more SPL, but a larger box will be needed. Then port tuning becomes and issue as well. Since these subs have a resonance of 30Hz (Free air) tuning to ~38Hz is about right.
However, you will need less power to reach maximum excursion limits with these subs in a ported box and set your LP filter at or slightly above tuning freq.... say 40Hz.
Again, getting some port design info from Alpine is recommended.
This one may work out well for your subs:
ZV-102 Dual 10" Vented 3/4" MDF Box w/ 1.5" Baffle - 1.4cf per sub
13 1/2"h x 18 1/4"d x 30"w $149.99
Replies (7)
Swez on 09/3/2003 06:45:08
I can only find specs on sealed enclosure volume for Alpine SWR subs as well.
http://ecominet2.alpine-usa.com/pls/admn/item_info?p_item_name=SWR-1041D&p_category=70&p_subcategory=150&p_main=10&p_more=y
Recommended Box Types : Sealed/Vented/Bandpass
Recommended Sealed Box Volume : 0.55 – 0.8 cu. ft.
You may have to write to Alpine Tech Services for details on ported enclosure recommendations.
Also, this sub come in a 2+2 & 4+4 ohm DVC configuration. Do you have an amp yet? If so, what do you have or plan to use to power these subs?
Swez
uochronos on 09/3/2003 07:15:20
they are the 4ohm + 4ohm. and i'm running them on a phoenix gold tantrum series amp 500.2 bridged and its puting out 500watts i'm running the subs in a sealed generic R/T box. its reasonably close to the cubic feet recomended. but i think they would sound 100% better in a box that was built for them
Swez on 09/3/2003 07:19:42
Maybe, maybe not.... you have about 10% leway here in sub enclosures. R/T makes a fair box and very cheap $$ too.
Do you know the cf/chamber for each sub? Also, what is the RMS output of this amp @ 2 ohms/ch?
Swez
uochronos on 09/3/2003 07:23:39
not sure exactly what the chamber size is in the box i told them to give me what ever they had that was closest(dumb of me not to ask) they said the box was pretty close but they recomended a custom one(from them so it may have just been them wanting more money) and the amp is a 125watt x2 channels at 4ohm 250 watt x2 channels at 2 ohm and 500watts x1 channel at 4 ohms. phoenix golds web site does say this though IASCA power rating 50watts/RMS x2 and 12.5volts not sure what IASCA is btw... also a little off topic here but my paper work that came with my amp says its stable down to 2ohms bridged is it a bad idea to run it that low though? and would i get alot more power?
Swez on 09/3/2003 07:34:29
Very unusual to have a 2 channel (Class A/B) amp that is 2 ohms stable in MONO bridged mode. It may get a bit hotter if you did try this. I doubt you will get more power from this amp @ 2 ohms bridged. If it did, the specs would reflect same.
The safe way to get max power from this amp is to run each channel 2 ohms (1 sub in parallel) to each channel is easiest way.
About your present enclosure, do you have the H,W & D dimensions on it? I can roughly calculate the cf internal based on that. Does it have a center divider panel as well?
Swez
uochronos on 09/3/2003 07:40:58
I would get more power out of the amp running each sub off one channel then with it bridged and both subs in hooked to that one channel? the box measures 13"x11"x30" it does have a center divider.. also the side thats 11 slants at and angle and the low side of that angle is 9"
Swez on 09/3/2003 11:52:03
I am guestimating this encosure is roughly 0.66 - 0.70 cf per chamber and not bad for your subs. Right in the middle.
Best power is either way you mentioned... just a lot easier to wire DVC's to a 2 channel amp as I mentioned earlier. Either way, 2 channels @ 2 ohms = 250 RMS per sub OR both subs wired for a 4 ohm load, amp bridged MONO = 500 RMS/2 subs = 250/sub.
If you want to make the subs louder, ported will net ~+3 to +5dB more SPL, but a larger box will be needed. Then port tuning becomes and issue as well. Since these subs have a resonance of 30Hz (Free air) tuning to ~38Hz is about right.
However, you will need less power to reach maximum excursion limits with these subs in a ported box and set your LP filter at or slightly above tuning freq.... say 40Hz.
Again, getting some port design info from Alpine is recommended.
This one may work out well for your subs:
ZV-102 Dual 10" Vented 3/4" MDF Box w/ 1.5" Baffle - 1.4cf per sub
13 1/2"h x 18 1/4"d x 30"w $149.99
Copyright ClubKnowledge 2009 * All Rights Reserved
