extra true subwoofer as mid bass module ...

[mike c]

the other night, in one of my night duty shifts to guard the baby ...

I was seriously contemplating ordering a HSU MBM because as per SVS, 220v units of the new ultra will not be ready for a "few" more months.

to save some money, I thought I could use one of my subwoofers as an mbm, if I could introduce a subsonic filter at 50hz.

I could have used a behringer crossover that would have cost around 100 bucks + rca to xlr and xlr to rca connectors/cables ...

I remembered majorloser? linked an fmod 50hz subsonic filter that cost 29 bucks. (unfortunately, shipping cost 15-20 bucks - yes it sucks)

to be continued ... lunch break ...

 

[Tomorrow]

the other night, in one of my night duty shifts to guard the baby ...

I was seriously contemplating ordering a HSU MBM because as per SVS, 220v units of the new ultra will not be ready for a "few" more months.

to save some money, I thought I could use one of my subwoofers as an mbm, if I could introduce a subsonic filter at 50hz.

I could have used a behringer crossover that would have cost around 100 bucks + rca to xlr and xlr to rca connectors/cables ...

I remembered majorloser? linked an fmod 50hz subsonic filter that cost 29 bucks. (unfortunately, shipping cost 15-20 bucks - yes it sucks)

to be continued ... lunch break ...

If you didn't live on an island, Mike, the shipping (literally) would........

You may need more than just the filter to make a conversion. The theory behind the fast response of the MBM is keyed off of its lightweight cone, a low inductance voice coil. It has a pretty beefy magnet, too. So you might need a driver to go with that filter. And whoa...there's the tuning of the box, and......

 

[mike c]

continuation ...

I remembered majorloser? linked an fmod 50hz subsonic filter that cost 29 bucks. (I later foud out, shipping cost 15-20 bucks - yes it sucks) well, i'm still ordering it ...

my future setup would look like:
option1: ultras 50hz down, dd18 50hz up (when the ultras become available)
option2: dd18 50hz down, dls-5000R/axiom 50hz up

did I do right in choosing the fmod adapter from hlabs rather than the behringer crossover?

behringer con:
an additional item to power up
more expensive, but more flexible ...


I sent an email to HSU that night asking info re: 220v; shipping to canada; taxes ... but never got a reply so I went ahead and ordered the fmod.

 

[mike c]

If you didn't live on an island, Mike, the shipping (literally) would........

You may need more than just the filter to make a conversion. The theory behind the fast response of the MBM is keyed off of its lightweight cone, a low inductance voice coil. It has a pretty beefy magnet, too. So you might need a driver to go with that filter. And whoa...there's the tuning of the box, and......

I realize the tuning of the mbm is much much higher, therefore helps with output ... but I'm thinking a 15" or 18" subwoofer placed right behind the couch (less than 2 feet from my back) should be able to cut it ...

i hate this island ...

 

[annunaki]

A 15" or 18" driver is going to have A LOT of energy at those frequencies. You may have to attenuate the level somewhat?

What are you using for mains and surrounds? What is the -3db point on those speakers??? If your speakers are good down to 50hz or so, just lower the x-over point in your system.

Using a DD18 as a MBM seems like a total waste of a good sub. A 12" or 10" would do much better as an MBM. The ear is much more sensitive above 50hz and would require less output to balance the sound.

 

[mike c]

i think only my fronts are capable of a lower crossover ... but my receiver can only set a universal crossover for all channels ...

my surrounds are Infinity beta 10's (5.25" driver) -3db 60hz
http://www.infinitysystems.com/home/products/product_detail.aspx?prod=BETA10BKS&ser=BET&Language=ENG&Region=USA&Country=US

my center is the c360 does 45hz (though I doubt that)
http://www.infinitysystems.com/home/products/product_detail.aspx?prod=BETAC360BK&ser=BET&Language=ENG&Region=USA&Country=US

my fronts are the 50's whose -3db is 35hz (I sure am glad I bought these instead of any smaller variation)
http://www.infinitysystems.com/home/products/product_detail.aspx?prod=BETA50BK&ser=BET&Language=ENG&Region=USA&Country=US

re: DD18 as mbm ... I wonder if people can distinguish a flat, low THD 50-80hz between subwoofers. I mean, if people don't, I sure can use any other subwoofer.

re: attenuation ... I'll have an sms-1 to balance things out between the high bass and low bass