Hi there pro's
need some help in box size here are my things:
HU: alpine 9807
amps: one 5ch mrv-f357 50 rms per channel + mono 150 rms
one 1/2 ch mrv-t757 225 rms per channel
rca : monster cable
speakers: alpine 1 pair spr-176a type r components 50rms
subs: two sws-1040 ten inche type s each 200 rms
i used to have a bass tube ported sub jbl the bass pounds even it's a small sub on the 5 channel amp
now i got the alpine 2 ch amp alpine mrv-t757 i'm woundring if i should go for a sealed ported box , my subs are quite old so i tried to find the recommended size for the box i didn't find any info about it.
so plz guide me for box dimention i'm wiling to have a tringle box
many thanks
only tuning
Replies (4)
ttocs on 10/28/2005 07:49:16
alpine subs?
http://www.carreview.com/cat/car-audio/subwoofers/alpine/PRD_54277_1808crx.aspx#reviews
Are they in a box now? Reading their reviews may help you decided if you want to try a different box.
swez on 10/28/2005 11:36:35
Those are a few year old by now and hard to find data on Alpine site for them. The newer SWS series subs are probably very similar in design and performance, but have DVC coils now. Here are the box recommendations for the newer SWS series. I would use these as a guide:
Optimum Sealed Box Volume : 1.0 cu.ft.
Optimum Vented Box Volume : 1.2 cu. ft.
Recommended Box Types : Sealed/Vented/Bandpass
Recommended Sealed Box Volume : 0.65 – 1.5 cu. ft.
Note: The larger the enclosure used, the more deep bass you will get. However, there is a trade off in power handling ability and loss of crisp, tight bass in larger sealed or vented box designs.
From experience in sub enclosures, I would target 0.85 cf/sub sealed here. That size will give good tight bass and decent low bass extension in a sealed box design.
Swez
PS That mrv-t757 amp is going to be limited on how much power it can deliever to your subs. When bridged, it can deliver ~400 Wrms @ 4 ohms. Your subs are SVC, 4 ohm models and need to be wired in series (8 ohms net) for this amp.That gives each sub 100 Wrms. Not bad, but not optimal either.
The MRP-M350 or M301 would be a better choice as they are Class D amps and can handle 2 ohm loads. They also offer more power output to your subs in parallel wiring mode. In fact, any solid Class D amp that can deliver 350-400 Wrms @ 2 ohms, will be a good option.
only_tuning on 10/28/2005 17:35:08
first thanks for support
second , your right my subs are quite old , my subs are svc 4ohm,
what i found which is close to my subs specs under this web:
http://www.hookedontronics.com/show_product_details.jsp?cid=974#fe
and about my 2ch amp i'm sure it's 225 rms at 4ohm per ch
as you said the bigger the sealed box the deeper it goes , i'll support you with my trunk space and dimentions so then will figure out what's the best dimetions to choose,
many thank
swez on 10/28/2005 20:11:21
Alpine Tech manual for that amp notes the following:
RMS power at 14.4 volts, 20-20Khz.
Per channel @ 4 ohms: 100 x 2 Wrms (0.08 THD%)
Per channel @ 2 ohms: 200 x 2 Wrms (0.03 THD%)
Bridged 4 ohms: 400 x 1 Wrms (0.03 THD%)
Again, not all bad. Just not the optimal match up. (the 225 Watts x 2 is MAX power rating, not RMS)
The sub mounting face will need to be a min of 12" HeIght and each chamber has a min width of 12.5". (Assuming 3/4" MDF as material here)
Here's a general plan for your sub enclosure: (External dimensions, with a 3/4" thick divider board in center of box.)
Height: 12.0"
Width: 25.0" (12.5/chamber)
Depth: 15.0"
These dimensions will net about 0.88cf/sub. If you want a bit larger box, can go to 17.0" depth for 1.0 cf/sub.
Will that fit?
Swez
need some help in box size here are my things:
HU: alpine 9807
amps: one 5ch mrv-f357 50 rms per channel + mono 150 rms
one 1/2 ch mrv-t757 225 rms per channel
rca : monster cable
speakers: alpine 1 pair spr-176a type r components 50rms
subs: two sws-1040 ten inche type s each 200 rms
i used to have a bass tube ported sub jbl the bass pounds even it's a small sub on the 5 channel amp
now i got the alpine 2 ch amp alpine mrv-t757 i'm woundring if i should go for a sealed ported box , my subs are quite old so i tried to find the recommended size for the box i didn't find any info about it.
so plz guide me for box dimention i'm wiling to have a tringle box
many thanks
only tuning
Replies (4)
ttocs on 10/28/2005 07:49:16
alpine subs?
http://www.carreview.com/cat/car-audio/subwoofers/alpine/PRD_54277_1808crx.aspx#reviews
Are they in a box now? Reading their reviews may help you decided if you want to try a different box.
swez on 10/28/2005 11:36:35
Those are a few year old by now and hard to find data on Alpine site for them. The newer SWS series subs are probably very similar in design and performance, but have DVC coils now. Here are the box recommendations for the newer SWS series. I would use these as a guide:
Optimum Sealed Box Volume : 1.0 cu.ft.
Optimum Vented Box Volume : 1.2 cu. ft.
Recommended Box Types : Sealed/Vented/Bandpass
Recommended Sealed Box Volume : 0.65 – 1.5 cu. ft.
Note: The larger the enclosure used, the more deep bass you will get. However, there is a trade off in power handling ability and loss of crisp, tight bass in larger sealed or vented box designs.
From experience in sub enclosures, I would target 0.85 cf/sub sealed here. That size will give good tight bass and decent low bass extension in a sealed box design.
Swez
PS That mrv-t757 amp is going to be limited on how much power it can deliever to your subs. When bridged, it can deliver ~400 Wrms @ 4 ohms. Your subs are SVC, 4 ohm models and need to be wired in series (8 ohms net) for this amp.That gives each sub 100 Wrms. Not bad, but not optimal either.
The MRP-M350 or M301 would be a better choice as they are Class D amps and can handle 2 ohm loads. They also offer more power output to your subs in parallel wiring mode. In fact, any solid Class D amp that can deliver 350-400 Wrms @ 2 ohms, will be a good option.
only_tuning on 10/28/2005 17:35:08
first thanks for support
second , your right my subs are quite old , my subs are svc 4ohm,
what i found which is close to my subs specs under this web:
http://www.hookedontronics.com/show_product_details.jsp?cid=974#fe
and about my 2ch amp i'm sure it's 225 rms at 4ohm per ch
as you said the bigger the sealed box the deeper it goes , i'll support you with my trunk space and dimentions so then will figure out what's the best dimetions to choose,
many thank
swez on 10/28/2005 20:11:21
Alpine Tech manual for that amp notes the following:
RMS power at 14.4 volts, 20-20Khz.
Per channel @ 4 ohms: 100 x 2 Wrms (0.08 THD%)
Per channel @ 2 ohms: 200 x 2 Wrms (0.03 THD%)
Bridged 4 ohms: 400 x 1 Wrms (0.03 THD%)
Again, not all bad. Just not the optimal match up. (the 225 Watts x 2 is MAX power rating, not RMS)
The sub mounting face will need to be a min of 12" HeIght and each chamber has a min width of 12.5". (Assuming 3/4" MDF as material here)
Here's a general plan for your sub enclosure: (External dimensions, with a 3/4" thick divider board in center of box.)
Height: 12.0"
Width: 25.0" (12.5/chamber)
Depth: 15.0"
These dimensions will net about 0.88cf/sub. If you want a bit larger box, can go to 17.0" depth for 1.0 cf/sub.
Will that fit?
Swez
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