Setup correctly, I bet you never would know there are 5 woofers playing at the same time. It's kinda magical how the mid and high imaging is way better with subs.
Do two 6" woofers = one 12" woofer ?
- Thread starter hpm40
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Sgt Shultz
Addicted Member
LOL, they're not all in the same room, I like running twin subs in stereo.
Lavane
Lunatic Member
Your right, the passive radiators can be very effective. Once you get used to the tighter bass, and it doesn't take long, ported speakers can sound kind of boom or flabby after in comparison.
Lavane
Lunatic Member
I will add, I have read some concerning using multiple smaller midbass drivers. They can cause a combing effect in the midrange with them being horizontally mounted from what I've read. But I don't notice anything off myself with these Monitor 10's. But Polk did build crossovers that set the crossover points different between the two drivers in the Monitor 11's and bigger 12's that supposedly took care of this problem. So the speakers then had to be marked left and right.
Thanks everyone for your input, this is a great discussion. I understand the bore and stroke analogy relating to the original question.
Am I reading correctly.... do some of you actually make your own speakers and subs ? I know there are many people who understand these things but it's always been over my head. But I find it very interesting.
Are passive radiators mostly in high-end speakers ?
Am I reading correctly.... do some of you actually make your own speakers and subs ? I know there are many people who understand these things but it's always been over my head. But I find it very interesting.
Are passive radiators mostly in high-end speakers ?
I like one driver per frequency range. Monitor 7B
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Lavane
Lunatic Member
The 7's are the the much better balanced speaker in the Monitor line.
I barrowed a pair awhile back. Nice speakers.
A generalization, and only sometimes accurate.
As I’ve owned multiple examples of every type of speaker except plasma in my many years of audioholicism, I can say that there are plenty of “one-note-bass” examples in every type of cone-in-box design, and also plenty of excellent and accurate bass.
Since there is no spec for “tight bass” nor “flabby bass”, it is hard to quantify claims, and usually they’re either a bad design or a bad amplifier-speaker pairing.
I get really tired of the claim that any particular design is better or worse at bass, they are all good or bad based on how well executed the design is.
I run two DIY's in the main. 2 Focals subs in one car.
I made my home system subs, acoustic suspension. 4-cubic foot internal volume boxes.
Lavane
Lunatic Member
Only a single 10" sub in my Jeep. Its just so small of a cab and space and the space behind the rear seat is limited. Plus I need some room for some recovery gear like tow straps, tree straps, snatch block, etc. The little 300 watt sub amp I'm using is plenty big enough and doesn't take up much room at all.I run two DIY's in the main. 2 Focals subs in one car.
DIY way back in college. Woofers have had 1 re-cone and 1 re-surrounds.
Hand-wound air core choke.
Upgraded with Solen PPE caps.
Subs on.
Run-out: XSM47855-2BA [small] P [scrawled] II
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It's part of a crossover system. I have a passive crossover to filter out frequencies above 100Hz.
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I have three AlNiCo 2235s (LCR), all recharged, twice, and a W15GTi driven from a Crown PSA-2XH in bridged mono used as a sub, and four W10GTis in the four surround speakers in my home theater...,
and Sunfire Signiture sub with a 10" and 10" PR. The Sunfire goes lower, louder, more linear then everything else combined.
and Sunfire Signiture sub with a 10" and 10" PR. The Sunfire goes lower, louder, more linear then everything else combined.
No lie.
Anyway, I choose my woofers by how well they do their midrange and those woofers happen to be intended for vented use. So vented it is.
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Sgt Shultz
Addicted Member
I have several ported that would be impossible to tell without either removing the grill (front ported) or turned around (rear ported), no flabby bass, it's all in the implementation.
One of my favorite inexpensive smaller speakers I've given to several family members or friends (one of these days I'll keep a pair for myself) is front ported.
Infinity RS-325
I wish I had taken a picture- but once, I designed and assembled a giant cube sub- a 26" cube, with a JBL 2245H 18", a custom 18" passive radiator (with about 1.5" of excursion), and a 500 watt plate amp with parametric EQ.
It would make plate glass windows move so much at 20Hz, that one would start to worry about shattering the glass.
That's a passive radiator.
I also built this- and fortunately, DID take pictures:
The woofers in that, were TC Sounds 10" with 18mm X-max each.
On the rear, were THREE identical-looking drivers- 10" TC Sounds passive radiators of the same design, with 30mm max linear excursion, in each direction.
It also had a 500 watt plate amp in it.
Due to the higher X-max- each one of these, would do everything that JBL 18 with passive radiator sub would do, but all the way down to 16Hz. And remember- there's a STEREO PAIR of these...
Regards,
Gordon.
It would make plate glass windows move so much at 20Hz, that one would start to worry about shattering the glass.
That's a passive radiator.
I also built this- and fortunately, DID take pictures:
The woofers in that, were TC Sounds 10" with 18mm X-max each.
On the rear, were THREE identical-looking drivers- 10" TC Sounds passive radiators of the same design, with 30mm max linear excursion, in each direction.
It also had a 500 watt plate amp in it.
Due to the higher X-max- each one of these, would do everything that JBL 18 with passive radiator sub would do, but all the way down to 16Hz. And remember- there's a STEREO PAIR of these...
Regards,
Gordon.
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Lavane
Lunatic Member
I have portend speakers that aren't boomy either. But so many were.
Lavane
Lunatic Member
Very nice.I wish I had taken a picture- but once, I designed and assembled a giant cube sub- a 26" cube, with a JBL 2245H 18", a custom 18" passive radiator (with about 1.5" of excursion), and a 500 watt plate amp with parametric EQ.
It would make plate glass windows move so much at 20Hz, that one would start to worry about shattering the glass.
That's a passive radiator.
I also built this- and fortunately, DID take pictures:
The woofers in that, were TC Sounds 10" with 18mm X-max each.
On the rear, were THREE identical-looking drivers- 10" TC Sounds passive radiators of the same design, with 30mm max linear excursion, in each direction.
It also had a 500 watt plate amp in it.
Due to the higher X-max- each one of these, would do everything that JBL 18 with passive radiator sub would do, but all the way down to 16Hz. And remember- there's a STEREO PAIR of these...
Regards,
Gordon.