Group Delay in SVS SB-1000 Pro

[OldRaggedDog]

I am in the market for a sub and my options are limited due to restricted space (most I can afford is 38cm in width). My choices have boiled down to SVS SB-1000 Pro and KEF Kube 10 MIE.

The problem is, SVS SB-1000 Pro seems like a great choice, but I am somewhat concerned with it's high group delay below 40hz. The sub is likely to be crossed at 45-50Hz so I need it to cover this region specifically. Sources claim that group delay isn't gonna be noticeable at frequencies so low, but I kind of have my doubts. On the other hand, there are no respective measurements of KEF Kube 10 and its group delay.

Any thoughts? Should I be worried about the delay, should I look elsewhere for a good sub which is precise below 40hz? I can go up to 1200 USD probably but size is an issue.

I should note that I listen at moderate volumes and the sub is only needed for music - rumble is not what I need, I just need to hear what's going on in the mix below 40Hz

 

[theREALdotnet]

The problem is, SVS SB-1000 Pro seems like a great choice, but I am somewhat concerned with it's high group delay below 40hz.

What is is your source for this? I'm surprised to hear that a sealed box loudspeaker would have any group delay. Could this be about the SVS PB-1000 perhaps? Or maybe it's the "Pro" bit, i.e. the built in DSP? If so, would the SVS SB-1000 classic be a better choice?

 

[Old_School_Brad]

I’d say your worries are unfounded.

 

[OldRaggedDog]

What is is your source for this? I'm surprised to hear that a sealed box loudspeaker would have any group delay. Could this be about the SVS PB-1000 perhaps? Or maybe it's the "Pro" bit, i.e. the built in DSP? If so, would the SVS SB-1000 classic be a better choice?

The measurements can be found on this forum:

I measured 10 subwoofers.

Hi, it's been a while! I would like to thank the people who made this project possible on a scale never before imagined in South Korea. I measured a total of 10 subwoofers, including my own DIY subwoofer(L26RO4Y), and measured them to the CEA-2010 standard using a Klippel TBM module. Below are...

www.audiosciencereview.com

Also:

SVS PB-1000 Pro and SB-1000 Pro Subwoofers Review

SVS has totally redesigned their entry-level powered subwoofers in the PB-1000 Pro and SB-1000 Pro. Our review reveals these subs go well beyond entry-level performance. Read on to find out how.

www.audioholics.com

 

[charlielaub]

The group delay response for the PB-1000 is not really high until you get to 30Hz and below. The ear+brain is very insensitive to high group delay at very low frequency.I would not worry about it.

I have to point out that crossing THIS sub over at 45 Hz is kind of stupid. If you are going to cross that low, find a closed box sub with better LF extension. The SB-1000 is rolling off starting around at 30 Hz and slope seems to be around 24dB/oct (judging from the I measured 10 subs thread measurements) so it looks like there is a highpass filter on it or a peaking filter to keep the passband flat until 30Hz. That could be the source of the high GD.

A "dumb" sealed subwoofer would be better, because it has a shallower 12dB rolloff that will have more LF output (below 30 Hz) and can be matched to the room response (that typically rises at around that rate) using a Linkwitz Transform filter or if you know what you are doing via a dedicated design and careful driver selection. Drive the sub(s) using an outboard amp and crossover or DSP unit with LT capability.

An SDX10 (10") or SDX12 (12") kit of driver plus flatpack from e.g. CSS would be perfect and likely much better overall than the SVS product. I own a pair of the SDX12 each in a 1.5 cuft sealed enclosure (not the CSS enclosure) plus some LT extension control and they are very good sounding.

 

[Richx200]

I am in the market for a sub and my options are limited due to restricted space (most I can afford is 38cm in width). My choices have boiled down to SVS SB-1000 Pro and KEF Kube 10 MIE.

The problem is, SVS SB-1000 Pro seems like a great choice, but I am somewhat concerned with it's high group delay below 40hz. The sub is likely to be crossed at 45-50Hz so I need it to cover this region specifically. Sources claim that group delay isn't gonna be noticeable at frequencies so low, but I kind of have my doubts. On the other hand, there are no respective measurements of KEF Kube 10 and its group delay.

Any thoughts? Should I be worried about the delay, should I look elsewhere for a good sub which is precise below 40hz? I can go up to 1200 USD probably but size is an issue.

I should note that I listen at moderate volumes and the sub is only needed for music - rumble is not what I need, I just need to hear what's going on in the mix below 40Hz

Have you looked at your room response? There is no telling what the sub will sound like in the room, especially since you don't have the ability to move it around. You could look at REW's room sim to get an idea of your modals, but again you have to measure the sub in the room. I could be the room that is causing you 40hz problem.

However. I would try the SVS SB-1000 only because if you order it direct from SVS, you get 45 days to try it out with free returns if it doesn't work out for you.