posted
Basically a ABC box would be comparable to a 7th order bandpass the best.. They are similar, as a generalization, you would gain SQ with the ABC and gain efficiency with the BP.. They are both dual tuned boxes, just one has the woofer on the outside..
------------------ TEAM THUNDER TEAM NOISY TOYS Mobile Image Autosound Authorized ATOMIC THUNDER Dealer for Nashville Authorized OHIO GENERATOR Dealer
posted
OK LETS GET SOMETHING STRAIGHT WE ARE NOT TALKING ABOUT A BANDPASS OR AN APERIODIC BOX HERE WE ARE TALKING ABOUT THE DOUBLE CHAMBER REFLEX the following is an excerpt from the great sound stereo speaker manual which i have pesonally had since 1993 but ithink was first printed around 1986 so we aren't doing anything new here
the double chamber reflex is designed to load the woofer over a wider band of frequencies than a single chamber box.the first compartment behind the woofer, usually has twice the cubic volume of the second compartment. if equal lenght ports are used for the two chamambers and to connect them, the woofer sees two resonance frequencies an octave apart. at the lower frequency, the woofer behaves as if it were installed in a single chamber box with a cubic volume equal to the total volume of the two compartments .the double frequency loading makes the double chamber box somewhat more tolerant of driver variations than an ordinary ported box
and that is the bottom lime because DAVID B WEEMS said so
posted
Hmmmm....anybody else have trouble posting last night? Put the first one thru, couldn't see it after re-loading the page, tried again later, and now 2 of 'em show up.....
And now the post count is all screwy....damn computers....
------------------ BigRedGuy Still bumpin' after all these years Kenwood/AudioControl/Orion/Orion/LightningAudio
[This message has been edited by BigRedGuy (edited 11-03-2000).]
posted
So from what I can gather here is this. An ABC box really is just a special case ported box. Now what if instead of the 2-1 ratio I went with a 2.5-1 ratio. i.e. main chamber is 2.5 ft^3 and the smaller is one. If the main was tuned to 28hz or so would this put the secondary at 2.5 * 28 tuning. Would it work with a box tuned to 28hz and the other tuned to 70? Thoughts? Would it sound good also.
------------------ GO TEAM GATES IN KC...BEAT EM TO THE GROUND! This has been your daily dose of intelligence brought to you in part by... "The Phil" President and Founding member of TEAM DROP BEATS a.k.a Team Db -1 99' Nissan Sentra -1 Pioneer-DEHP5200 -4 RF 6.5 coaxials -4 Kenwood tweets -2 RF power 800a2's -2 Kove KMG-K 12's(soon to be 2 DD 9012's) -1 3.9 ft^3 41.6 Hz ported box -146.7 dbs Any Questions? please submit to the complaint department, 1123 Yourole knowit drive Causeidontcare IL. 60131
Posts: 2654 | From: unknown bowels of the underworld | Registered: Aug 2000
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quote:Originally posted by PHILESTER: So from what I can gather here is this. An ABC box really is just a special case ported box. Now what if instead of the 2-1 ratio I went with a 2.5-1 ratio. i.e. main chamber is 2.5 ft^3 and the smaller is one. If the main was tuned to 28hz or so would this put the secondary at 2.5 * 28 tuning. Would it work with a box tuned to 28hz and the other tuned to 70? Thoughts? Would it sound good also.
It should.. Im going to try different ratios to tweak the tuning for somoother overall sound on my next one.
------------------ TEAM THUNDER TEAM NOISY TOYS Mobile Image Autosound Authorized ATOMIC THUNDER Dealer for Nashville Authorized OHIO GENERATOR Dealer
posted
Ohh I forgot to ask also...Does the woofer actually "see" the entire volume of the box. I was kind of thinking that it would only see both chambers if the freq was below the 2nd chambers tuning. If the freq was at the point of the second maybe the woofer would only think it is in the first chamber? I dont know. This is the first I am trying to learn about this type of box so fill me in guys and damn we are lucky that forums like this exist to swap info on.
------------------ GO TEAM GATES IN KC...BEAT EM TO THE GROUND! This has been your daily dose of intelligence brought to you in part by... "The Phil" President and Founding member of TEAM DROP BEATS a.k.a Team Db -1 99' Nissan Sentra -1 Pioneer-DEHP5200 -4 RF 6.5 coaxials -4 Kenwood tweets -2 RF power 800a2's -2 Kove KMG-K 12's(soon to be 2 DD 9012's) -1 3.9 ft^3 41.6 Hz ported box -146.7 dbs Any Questions? please submit to the complaint department, 1123 Yourole knowit drive Causeidontcare IL. 60131
Posts: 2654 | From: unknown bowels of the underworld | Registered: Aug 2000
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posted
damn...i got anouther question now. How do I calculate the ports. Example if I have a 3 ft^3 box w/ a 2 ft and a 1ft chamber and I want a tuning of 30 hz on the main chamber, do I calc the port assuming a volume of 2 ft^3 or 3 ft^3. thanx again...i will stop now.
------------------ GO TEAM GATES IN KC...BEAT EM TO THE GROUND! This has been your daily dose of intelligence brought to you in part by... "The Phil" President and Founding member of TEAM DROP BEATS a.k.a Team Db -1 99' Nissan Sentra -1 Pioneer-DEHP5200 -4 RF 6.5 coaxials -4 Kenwood tweets -2 RF power 800a2's -2 Kove KMG-K 12's(soon to be 2 DD 9012's) -1 3.9 ft^3 41.6 Hz ported box -146.7 dbs Any Questions? please submit to the complaint department, 1123 Yourole knowit drive Causeidontcare IL. 60131
Posts: 2654 | From: unknown bowels of the underworld | Registered: Aug 2000
| IP: Logged |
posted
Dang this post is STILL alive Dukk people just love your box This post started about the time I satrted coming to this forum I fil like I have grown up with this post
------------------ Team Sick Bastard Future 3-4 xtreme For Xtreme Audio Contact VvVLoKiVvV@aol.com Offical Page Underconstruction
posted
Ok i have a single Rf xlc 12 4 ohm, and i want to try an ABC for it, i have no idea how to figure out the tuning or any thing, so can someone please help me design one . It can be be as big aas needed cause i got plenty of room
------------------ GO TEAM GATES IN KC...BEAT EM TO THE GROUND! This has been your daily dose of intelligence brought to you in part by... "The Phil" President and Founding member of TEAM DROP BEATS a.k.a Team Db -1 99' Nissan Sentra -1 Pioneer-DEHP5200 -4 RF 6.5 coaxials -4 Kenwood tweets -2 RF power 800a2's -2 Kove KMG-K 12's(soon to be 2 DD 9012's) -1 3.9 ft^3 41.6 Hz ported box -146.7 dbs Any Questions? please submit to the complaint department, 1123 Yourole knowit drive Causeidontcare IL. 60131
Posts: 2654 | From: unknown bowels of the underworld | Registered: Aug 2000
| IP: Logged |
