Subwoofer design-Calling Mr. V.!

[GdnrBob]

I was on Audiogon today and Stringreen posted on a thread about the new NSMT Loudspeakers.

The OP responded:

Hey Stringreen,

You are correct Vandersteen has models with built-in active subwoofers. Many other companies build their own subwoofers to integrate with their own speakers. 

However, one of the innovative factors in the new NSMT System Two speaker is that Erol is one of the few designers who is brilliant at designing band-pass active subwoofers, instead of port loaded or acoustic suspension that has to be controlled electrically with either the cross-over or digital shaping. I get into a lengthy explanation of why band-pass designs are rare and sound significantly sound superior in many ways to the normal designs mentioned above in the review.

So, what the heck are 'Band Pass design' Subs?

Bob

[Stringreen]

Its all a about the music anyway.....

[Holmz]

2 hours ago, GdnrBob said:

I was on Audiogon today and Stringreen posted on a thread about the new NSMT Loudspeakers.

The OP responded:

Hey Stringreen,

You are correct Vandersteen has models with built-in active subwoofers. Many other companies build their own subwoofers to integrate with their own speakers. 

However, one of the innovative factors in the new NSMT System Two speaker is that Erol is one of the few designers who is brilliant at designing band-pass active subwoofers, instead of port loaded or acoustic suspension that has to be controlled electrically with either the cross-over or digital shaping. I get into a lengthy explanation of why band-pass designs are rare and sound significantly sound superior in many ways to the normal designs mentioned above in the review.

So, what the heck are 'Band Pass design' Subs?

Bob

Bob - Bandpass effectively uses a port as a choke to keep the upper frequency from being emitted out.
There also also higher order bandpass boxes that are mire efficient at the expense of group delay and transient response.
( I think they come in 6th and 8th order… the higher orders often being called “One Note Wonders”)

A “transmission line” is simpler and I believe odd order like 3rd?  (Probably 3rd as I think a seal box is 2nd order, an infinite baffle 1st order… and a bass reflex is 4th order??)
Generally the lower the order the better the transient response.

Poor transient response is attracts the subjective terms like “Muddy”.

But a bandpass can be great for HT use.

[stebaht]

Bandpass boxes are most commonly found in the trunks of Honda Civics. Not knocking the design obviously - but very commonly used for automotive subs. 

[GdnrBob]

Thanks guys, for the info. I have never heard about Bandpass before. Like many things audio, it comes down to what it is used for.- Though it seems that NSMT is using it for audiophile stereo rather than Home Theater/Theatre or car audio.

B

[Richard Vandersteen]

Everything we do is because we believe being "Time and Phase Correct" is important!  Others without this criteria have many options I won't consider.  I am not criticizing only stating what works for me and my customers, over 45 years this has not changed.  RV

[Holmz]

14 hours ago, stebaht said:

Bandpass boxes are most commonly found in the trunks of Honda Civics. …. 

Type R ?

[stebaht]

On 8/29/2023 at 1:07 AM, Holmz said:

Type R ?

More like the folks that like soup up their cars and put the huge subs in the back. Fast and Furious style!

[DC-93]

Don't forget the fart can muffler....  😆