Which is considered better?

Bob in St. Louis · « **Reply #20 on:** 13 Dec 2011, 09:01 pm »

Quote from: Æ on 13 Dec 2011, 07:08 pm

Doing 200mph in a Porsche!

And there we have it.

JLM · « **Reply #21 on:** 13 Dec 2011, 09:50 pm »

I agree with Bob about how useful 20 Hz response is. I had a 3-way that would reach 17 Hz at 114 dB, but it only sounded good in a 20,000 cu. ft. space (10 times the size of many living rooms). It overloaded the room.

My main and separate HT speakers now are rated to roughly 27 Hz and a much better domestic match.

Letitroll98 · « **Reply #22 on:** 14 Dec 2011, 12:16 am »

Is this the Lamborghini you intended to travel in at over 200 mph?

Æ · « **Reply #23 on:** 14 Dec 2011, 01:10 am »

Quote from: Letitroll98 on 14 Dec 2011, 12:16 am

Is this the Lamborghini you intended to travel in at over 200 mph?

If you have one of these, do you really care about the bass?

"The 917/30 was the most powerful sports car racer ever built and raced. The 5.374 litre 12 cylinder (90.0 x 70.4 mm) twin-turbocharged engine could produce 1,580 bhp (1,180 kW) in qualifying tune, with twin turbochargers run up to full boost, 39 psi (2.7 bar), though it usually raced with around 1,100 bhp (820 kW) at 7,800 rpm to preserve the engine. Weighing 1,800 lb (820 kg), giving it a power to weight of 1967.36 bhp/tonne in qualifying tune and 1369.68 bhp/tonne in race tune. The 917/30 dominated the Can-Am series during the 1973 season. The 917/30 could go from 0-62 mph (100 km/h) in 1.9 seconds, 0-100 mph (160 km/h) in 3.9 seconds, 0-200 mph (320 km/h) in 10.9 seconds, and on to a top speed of more than 260 mph (420 km/h). The high-level of performance and attendant fuel consumption of the engines, and ever increasing risk, has led to the 917/30 sometimes being cited as the car that killed Can-Am racing."

Bob in St. Louis · « **Reply #24 on:** 14 Dec 2011, 03:24 am »

Umm.. Yea, ok...

As much of an old school fan of the Rothman Porsche, I won't ask the burning question of.....Why?

Rclark · « **Reply #25 on:** 14 Dec 2011, 04:20 am »

I'd rather do 200mph on a modded, turbo'd Hayabusa. I have an idea it would be a much more visceral experience. There can't be many cars that can equal a 700 horsepower streetbike.

Letitroll98 · « **Reply #26 on:** 14 Dec 2011, 04:34 am »

We are so far off topic here, please somebody save us. For the love 'o Pete one of these cars had to have a woofer in there somewhere, at this point I don't even care if it's sealed or ported.

Æ · « **Reply #27 on:** 14 Dec 2011, 06:15 am »

Quote from: Rclark on 14 Dec 2011, 04:20 am

I'd rather on a. . . Hayabusa. I have an idea it would be a much more visceral experience.

Yes, it would be one heck of a ride.

Bob in St. Louis · « **Reply #28 on:** 14 Dec 2011, 02:33 pm »

Quote from: Letitroll98 on 14 Dec 2011, 04:34 am

We are so far off topic here, please somebody save us. For the love 'o Pete one of these cars had to have a woofer in there somewhere, at this point I don't even care if it's sealed or ported.

I'm sure they all have woofers, but do we really want to talk about subwoofers in a car?
Before we know it, we'll be talking about 2000 watt, 150 decibel system mounted in lowered Japanese cars.

Bob

dflee · « **Reply #29 on:** 14 Dec 2011, 03:35 pm »

This has been a fun topic and side show thus far. I pulled the 20 out just to tag a point to start. I know that some speakers can obtain better sound at differing HZ levels and that you can get cleaner from one manufacturer to the next. I was just wondering how sealed rolled off as opposed to baffled. I did not mean to rule out OB or combination of but thought that might put too many differences into the mix. Guess I was wrong. I have had my speakers in four different homes now and while the room has made a difference, the signature sound has not varied all that much that couldn't be tweeked to sound great again.

Æ · « **Reply #30 on:** 14 Dec 2011, 06:17 pm »

Quote from: dflee on 14 Dec 2011, 03:35 pm

This has been a fun topic and side show thus far. I pulled the 20 out just to tag a point to start. I know that some speakers can obtain better sound at differing HZ levels and that you can get cleaner from one manufacturer to the next. I was just wondering how sealed rolled off as opposed to baffled. I did not mean to rule out OB or combination of but thought that might put too many differences into the mix. Guess I was wrong. I have had my speakers in four different homes now and while the room has made a difference, the signature sound has not varied all that much that couldn't be tweeked to sound great again.

I think it's unanimous, sealed is better than vented.

charmerci · « **Reply #31 on:** 14 Dec 2011, 07:44 pm »

Quote from: Æ on 14 Dec 2011, 06:17 pm

I think it's unanimous, sealed is better than vented.

I'm sure that many people who own (or want to own) Jim Salk loudspeakers may disagree.

Æ · « **Reply #32 on:** 14 Dec 2011, 08:01 pm »

Quote from: charmerci on 14 Dec 2011, 07:44 pm

I'm sure that many people who own (or want to own) Jim Salk loudspeakers may disagree.

Well, after your minority reply it is no longer a unanimous decision. Still, the majority rules in this thread, which has favored sealed enclosures and very fast cars.

A bass reflex enclosure could be compared to a fast car, but not a very fast car. Ha!
(Low Qtc sealed alignments have faster transient response and less reverberation time.)

Bob in St. Louis · « **Reply #33 on:** 14 Dec 2011, 10:08 pm »

How about we take an official vote in the thread >> HERE <<.

Bob

Æ · « **Reply #34 on:** 15 Dec 2011, 12:07 am »

Quote from: Bob in St. Louis on 14 Dec 2011, 10:08 pm

How about we take an official vote in the thread >> HERE <<.

Bob

The OP only asked us to compare sealed and vented.
By the way, sealed is also considered to be infinite baffle. But Acoustic Suspension might not be.

Bob in St. Louis · « **Reply #35 on:** 15 Dec 2011, 01:13 am »

#1 The OP said "why" he discounted OB. One of us should skip back a bit and reread.
#2 IB is the same as sealed? You really just said that? I feel like the entire industry took a step back.

#3 I started the poll for fun. You too can start your own, and have IB and sealed as one and the same.

Bob

opnly bafld · « **Reply #36 on:** 15 Dec 2011, 01:16 am »

Quote from: Æ on 15 Dec 2011, 12:07 am

The OP only asked us to compare sealed and vented.
By the way, sealed is also considered to be infinite baffle. But Acoustic Suspension might not be.

Umm, NO!
It's kinda like squares and rectangles.
IB is sealed, but just because it's sealed doesn't mean it's IB.
AS is sealed, but just because it's sealed doesn't mean it's AS.

IIRC to be considered IB the enclosure needs to be at least 10x Vas and AS is max 1/3 Vas (or smaller), anything between is just referred to as sealed.

JohnR · « **Reply #37 on:** 15 Dec 2011, 01:24 am »

"Do some research" is a fairly unhelpful response. In current (popular) usage, "infinite baffle" is taken to mean a very large enclosure.

Nobody uses "acoustic suspension" any more... c'mon.

opnly bafld · « **Reply #38 on:** 15 Dec 2011, 01:28 am »

Quote from: JohnR on 15 Dec 2011, 01:24 am

"Do some research" is a fairly unhelpful response. In current (popular) usage, "infinite baffle" is taken to mean a very large enclosure.

Nobody uses "acoustic suspension" any more... c'mon.

Edited above.
AE did.

Æ · « **Reply #39 on:** 15 Dec 2011, 01:35 am »

Quote from: opnly bafld on 15 Dec 2011, 01:16 am

Umm, NO!
It's kinda like squares and rectangles.
IB is sealed, but just because it's sealed doesn't mean it's IB.
AS is sealed, but just because it's sealed doesn't mean it's AS.

IIRC IB is at least 10x Vas and AS is max 1/3 Vas, anything between is just referred to as sealed.

Next time you happen to get your hands on the LOUDSPEAKER DESIGN COOKBOOK (I have the 7th edition) by Vance Dickason, go ahead and turn to page 29.

1.10 DEFINITION.
"The closed-box is the simplest of all loudspeaker designs, consisting of an enclosed volume of air and the loudspeaker or driver. Its electrical and pneumatic circuits are analogous to a second order high-pass filter with the response controlled by the resonance and the associated damping. There are two types of closed-box systems: the infinite baffle (IB) and the air suspension (AS).