Possible enclosures for a Monacor SPH 60X - Page 3 - diyAudio
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Old 22nd May 2008, 10:32 PM   #21
GM is offline GM  United States
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Quote:
Originally posted by hm
sorry GM,
my KORNETT gets 35 HZ, tight strong fast.
I was referring to these in post #15: "That`s why I asked for needle or half chang or fonken ..."

Regardless, the Kornett is a relatively complex (by novice builder standards) dual driver, dual horn with what appears to be a rolled off LF response as already noted, though not knowing the details of how the measurements were made we do not know if it sounds that way in a typical room, so by my standards it may not be all that 'strong'.

Anyway, if everson were not so unreasonably (IMO!) dead set against any passive filtering I would suggest using two 60X drivers in a 2x larger ML-TL or ML-horn and use an inductor to roll off one at the baffle step, yielding a simple build with enough SPL down low to easily do 35 Hz at low distortion in-room.

GM
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Old 23rd May 2008, 12:40 AM   #22
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Quote:
Originally posted by everson
I`d like not to make any circuits
Hi everson, making a BSC is a snap! It's just a coil and a resistor in parallel on the + speaker terminal. Substitute an 8-ohm L-Pad for the resistor and it's now an adjustable 'tone control." Proper coil + some resistance = proper bass.

Plus you've gained a new knob to twiddle. If you can accomplish the same thing in other ways (e.g. digitally, or by using a wide baffle), that's cool. But otherwise, what's not to love about this simple and powerful tweak for cabs that require it?
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Old 23rd May 2008, 05:22 AM   #23
everson is offline everson  Serbia
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OK, let me ask a more concrete question:

Could I use this exact cabinet, with these exact measures ( http://www.ejjordan.co.uk/diy/ - MLTL-48 )?

Any other plan with measures (or a link where I could calculate measures)?
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Old 23rd May 2008, 09:21 AM   #24
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OK, here's one possible, based on Greg's suggestion for twin drivers per channel, rolling one off above the baffle-step frequency (415Hz).

45in x 9.5in x 6.0in (HxWxD). Central point between the two drivers (mount as close together as possible) 11in down from internal top. Vent 2in diameter 0.75in long, close to internal base as possible. ~max flat design, so damp to taste either by increasing the internal vent length or damping things down. Stuff 0.5lbs ft^3 of hollow fibre material from the top 28in down.
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Old 23rd May 2008, 09:29 AM   #25
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Single driver version: 34in x 6in x 5in (HxWxD) Driver-centre 8in down from internal top. Vent 2in diameter x 4in long, again close as possible to internal bottom. Stuff 0.5lbs ft^3 from the top 20in down.

Step frequency at ~608Hz, so you'll either need them in corners, or a compensation circuit.
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Old 23rd May 2008, 02:41 PM   #26
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Quote:
Originally posted by everson

Could you suggest a specific MLTL design? Any plans so a newbie could build it easily by following plans?
What's wrong with the one I already posted?: http://www.diyaudio.com/forums/showt...08#post1517208

GM
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Old 23rd May 2008, 03:06 PM   #27
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Quote:
Originally posted by everson

Could I use this exact cabinet, with these exact measures ( http://www.ejjordan.co.uk/diy/ - MLTL-48 )?
Yes, though like any other non-horn or 'helper' driver alignment it too will require BSC if positioned out in the room.

GM
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Old 23rd May 2008, 08:12 PM   #28
everson is offline everson  Serbia
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Thank you, guys!

I`ll consider them. I`m gonna make my final decision soon.

What about this one: http://geocities.com/rbrines1/Pages/...ml#RS 40-1354a

Again, thank you for your efforts!
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Old 23rd May 2008, 09:31 PM   #29
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That's the folded version that Greg was talking about.
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Old 24th May 2008, 04:28 AM   #30
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Actually, it's the same one I referenced if you scroll down the page I linked to. For whatever reason BB has it posted in two different places.

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