SRX718 to 'what powered/active sub?'

Re: SRX718 to 'what powered/active sub?'

So I upped my budget to $3k Retail. And I searched and searched at every powered box out there and it looks like I am looking at these models; does anyone have any experience with the subs?
dB Tech Sub 18D
dB Tech DVA S10
FBT Mitus 118SA
JBL VRX918SP
RCF 4Pro-8003AS
RCF NX S21A
RCF NX S25A

The new dB Technologies DVA S1518N doesn't have any sort of pricing posted.

Also, I hope at this year’s NAMM at the end of Jan and Musikmesse in April; there are some new releases for us Mid Level guys looking to get into the Powered Speaker gear.
 
Re: SRX718 to 'what powered/active sub?'

Hi Matt,

I have and like the Mittus 118SA's now. They're at the lower end of your budget and have worked really well for me thus far.

If you're willing to take a roadtrip to NJ, we might be able to arrange a demo of some of the RCF, DB Tech, and FBT boxes.

Jeff
 
Re: SRX718 to 'what powered/active sub?'

Jeffrey Knorr said:
Hi Matt,

I have and like the Mittus 118SA's now. They're at the lower end of your budget and have worked really well for me thus far.

If you're willing to take a roadtrip to NJ, we might be able to arrange a demo of some of the RCF, DB Tech, and FBT boxes.

Jeff
Click to expand...

I'd totally be in for a demo road trip too!!!!
 
Re: SRX718 to 'what powered/active sub?'

Jeffrey Knorr said:
Hi Matt,

I have and like the Mittus 118SA's now. They're at the lower end of your budget and have worked really well for me thus far.

If you're willing to take a roadtrip to NJ, we might be able to arrange a demo of some of the RCF, DB Tech, and FBT boxes.

Jeff
Click to expand...

Jeff;

I was looking at the spec sheet.

http://www.fbtusa.net/files/MITUS_118SA_USA_combined_PDF2.pdf

The amp is listed as 800 watts rms yet they have a 2400 watt peak listing? Of course I realize the time is listed in ms and SPL is listed in ms as well but all spec's seem stretched somewhat. How do they sound in real life?

Frequency response.
The 6 db down point is listed at 36hz. Looking at the frequency chart on page 2 if you call a reference line as average output of the sub to be at 100db output you find its 6db down point to be more "around" 46hz. ( I'd call the sub + or - 3 dbs from 50 to 105 hz ) At 36hz the chart shows its output to be down 20dbs from the 100db output reference. There is no 1/2 space or full space listed for the chart but the spl is listed on page 1 as half space. If the 36hz 6db down point is measuered after half space loading that would mean a 14db increase from full space to 1/2 space loading?

For 2 grand I'm wondering "How Did They Do That?" What your take?

Douglas R. Allen
 
Re: SRX718 to 'what powered/active sub?'

I've heard great things about the FBT Mitus (and FBT subs in general). After demoing, I just bought an FBT Vertus system. those tiny Vertus CLA208sa subs are ridiculous for their size. Not what you're looking for I understand, but I'm happy with what they do.
 
Re: SRX718 to 'what powered/active sub?'

Douglas R. Allen said:
Jeff;

I was looking at the spec sheet.

http://www.fbtusa.net/files/MITUS_118SA_USA_combined_PDF2.pdf

The amp is listed as 800 watts rms yet they have a 2400 watt peak listing? Of course I realize the time is listed in ms and SPL is listed in ms as well but all spec's seem stretched somewhat. How do they sound in real life?

Frequency response.
The 6 db down point is listed at 36hz. Looking at the frequency chart on page 2 if you call a reference line as average output of the sub to be at 100db output you find its 6db down point to be more "around" 46hz. ( I'd call the sub + or - 3 dbs from 50 to 105 hz ) At 36hz the chart shows its output to be down 20dbs from the 100db output reference. There is no 1/2 space or full space listed for the chart but the spl is listed on page 1 as half space. If the 36hz 6db down point is measuered after half space loading that would mean a 14db increase from full space to 1/2 space loading?

For 2 grand I'm wondering "How Did They Do That?" What your take?

Douglas R. Allen
Click to expand...

I am wondering if the 8 different presets have anything to do with the graph and ratings. I wish they said what the crossover setting was at on each.

The Presets are.
BASIC
1. Original: Corresponds to the typical FBT sound. It is the default general purpose preset and is thus fit for the majority of applications.
2. Deep: This preset extends and emphasizes the low range of the subwoofer, for a very deep and soft sound suitable for high quality and medium energy applications, such as acoustic music, jazz, etc..
3. Punch: the sound of the sub becomes drier, reduced low frequency extension but more energy concentrated in the 80-120Hz range. Suitable for rock music and high SPL applications
4. Infra: The filter is set to a lower frequency with respect to the other presets, thus only very low frequencies are reproduced.

ORIGINAL
5. Cardioid Front
6. Cardioid Rear

INFRA
7. Cardioid Front
8. Cardioid Rear
 
Re: SRX718 to 'what powered/active sub?'

Matt Vivlamore said:
I am wondering if the 8 different presets have anything to do with the graph and ratings. I wish they said what the crossover setting was at on each.
Click to expand...
Matt,

The various Mitus 118SA presets would change the charted raw response of the band pass cabinet to different curves, just like messing around with graphic or parametric EQ would.
The cabinet output level potential ultimately would be the same, which if the raw response curve is accurate, would indicate it would have about 2 dB less output at 40 Hz than a SRX 718 powered at about 1000 watts, while the Mitus would have perhaps as much as 10 dB more output around 70 Hz.
It would be worth a listen to hear if the extra SPL compared to sound quality is worthwhile.
My experience thus far with ported band pass designs is the sound quality hit is not worth the sensitivity gain, but I'm not a fan of droning bass.
 

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Re: SRX718 to 'what powered/active sub?'

Douglas R. Allen said:
Jeff;

I was looking at the spec sheet.

http://www.fbtusa.net/files/MITUS_118SA_USA_combined_PDF2.pdf

The amp is listed as 800 watts rms yet they have a 2400 watt peak listing? Of course I realize the time is listed in ms and SPL is listed in ms as well but all spec's seem stretched somewhat. How do they sound in real life?

Frequency response.
The 6 db down point is listed at 36hz. Looking at the frequency chart on page 2 if you call a reference line as average output of the sub to be at 100db output you find its 6db down point to be more "around" 46hz. ( I'd call the sub + or - 3 dbs from 50 to 105 hz ) At 36hz the chart shows its output to be down 20dbs from the 100db output reference. There is no 1/2 space or full space listed for the chart but the spl is listed on page 1 as half space. If the 36hz 6db down point is measuered after half space loading that would mean a 14db increase from full space to 1/2 space loading?

For 2 grand I'm wondering "How Did They Do That?" What your take?

Douglas R. Allen
Click to expand...
Douglas,
One can assume a sub is rated in half space unless it has rigging points and a chart specifically states full space. Testing a sub in full space requires it to be several wavelengths from the ground at the lowest frequency to be tested, that requires a very tall crane...
As you noticed, the Mitus 118SA peak rating is for 2ms burst, less than 1/10th of a 36 Hz cycle. Even the 500ms (one half second) "continuous" rating is a bit light, synth players can lean on a low note a lot longer than a half second.
The "Electronic Specifications" show 36 Hz at -6 dB, obviously the result of one of the presets used to tame the bandpass "hump in the middle" raw response.
Still, for 2 grand, looks like a real box with a real speaker and a lightweight amp.
 
Re: SRX718 to 'what powered/active sub?'

Art Welter said:
Matt,

.....It would be worth a listen to hear if the extra SPL compared to sound quality is worthwhile.

My experience thus far with ported band pass designs is the sound quality hit is not worth the sensitivity gain, but I'm not a fan of droning bass.
Click to expand...

I tend to agree. I've used primarily band pass designs in the past. The output versus size is impressive, but the quality of bass overall just isn't as good. If you try to EQ it to sound better you're generally making a cut that takes the SPL down and you have to be careful not to bump up frequencies outside the bandpass tuning or it sounds "farty". The result is you just can't tune to taste as easily, if at all. It's the trade off I've lived with due to space available for transport and output needed.

That said, having multiple presets is nice as their optimizing the DSP to get different characteristics. That's not a common thing. My new FBT subs have deep and punch as well and there is a noticeable difference between the two.
 
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