Weird Vas measurment help with LMS.

[Mass Car Audio 10+ year member]

I have 1500 rms at 2 ohms powering it.

 

[ciaonzo 5,000+ posts]

For a Qtc of .707 you're looking at 3.5cu.ft. sealed, heavy fill.

For a Qtc of .65 you will need 4.5cu.ft. sealed, heavy fill.

For a Qtc of .577 you will need 8cu.ft sealed, heavy fill.

 

[Mass Car Audio 10+ year member]

Thank you I really appreciate you help, I will start building all 3 boxes tomorrow. Do you have the 3db down point for those ?

 

[ciaonzo 5,000+ posts]

-3db takes place between 52hz and 61hz for the respective enclosures. 52hz corresponds with the .707 alignment. Working with the transfer function of your vehicle the .707 alignment will play pretty flat and should sound dry or punchy. The other alignments will begin to allow for much more pronounced output in the 30hz and down region. I would use the .65 alignment personally. It should provide the best balance of extension and detail while retaining it's composure under high power.

 

[Mass Car Audio 10+ year member]

-3db takes place between 52hz and 61hz for the respective enclosures. 52hz corresponds with the .707 alignment. Working with the transfer function of your vehicle the .707 alignment will play pretty flat and should sound dry or punchy. The other alignments will begin to allow for much more pronounced output in the 30hz and down region. I would use the .65 alignment personally. It should provide the best balance of extension and detail while retaining it's composure under high power.

What program are you using for this ? I have the aj designer program but it was giving me weird box sizes.

 

[ciaonzo 5,000+ posts]

Sorry for the delay, fuggin' site doesn't work for me late at night.

I use BassBox 6 Pro when modeling enclosures. It's only failed me once out of hundreds of uses.

 

[terra 5,000+ posts]

You're working with a chinese built LMS driver?

 

[Mass Car Audio 10+ year member]

You're working with a chinese built LMS driver?

LMS is a linear-x loudspeaker measuring system. Its a Chinese o.e.m car audio subwoofer i'm working with.

 

[terra 5,000+ posts]

LMS is a linear-x loudspeaker measuring system. Its a Chinese o.e.m car audio subwoofer i'm working with.

Ahh I just looked at the title.

 

[Mass Car Audio 10+ year member]

Sorry for the delay, fuggin' site doesn't work for me late at night.
I use BassBox 6 Pro when modeling enclosures. It's only failed me once out of hundreds of uses.

Ok thanks man, I'm going to get that program, the AJ designer program I have sucks.

 

[sundownz Pro Seller]

I have this Vas measurement I need help converting, the Vas in to liters. I need to find out how many liters are in 261.742m ***. I have no idea what m *** means in this LMS reading. If anyone can help me out it would be appreciated.

m (mili) cu (cubic) M (meters)

0.261 cubic meters

~9.2 ft^3

~261 L

Is this an 18" Driver ?

 

[sundownz Pro Seller]

Would be a pretty high VAS for something less than 18" for car audio, IMO //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[Mass Car Audio 10+ year member]

Would be a pretty high VAS for something less than 18" for car audio, IMO //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

It's a 15'' car audio driver. I plan on using it in car applications.

 

[terra 5,000+ posts]

Might be a tad impractical

 

[ciaonzo 5,000+ posts]

Might be a tad impractical

That was my concern as well. Initially, I was hoping the OP was considering an IB configuration because I knew the enclosure would be quite large, lol. Power handling is decent and Qts is acceptable but Xmax is coming in at around 16mm, who knows what the dynamic mechanical limits are.

OP, if there are two guys to trust with their input about drivers, Alex and Jacob are those guys.

Thanks for reinforcing those numbers Jacob. It was getting late and I wasn't 100% but I was pretty confident. Millicubic meters, huh? Lol. I need to buy that program.