TommyTwoTone
Stunt Coordinator
- Joined
- Dec 29, 2004
- Messages
- 59
Hello all,
I'm in the process of shopping for a subwoofer for HT use. I was first turned onto, and purchased, a SVS PB12-isd. It's a huge upgrade over my old DefTech 10" sub and I am impressed with its performance. However, I just couldn't get over how freakin' big it is! Since I was also considering an HSU sub I decided to try an STF-2 as well to see if I could get a good sounding sub in a smaller package.
Both subwoofers have a high grin factor, but I slightly favor the sound of one over the other. I took SPL readings for each, at two separate locations, to determine whether one performs better based strictly on FR. I'm just not sure what the graphs are telling me.
These tests were performed with Phase at 0 and main speakers disabled. Crossover was set to 120 Hz within my processor. Master volume was increased until 16 Hz tone read 80 dB on my Radio Shack Analog SPL Meter. The meter was placed on a tripod at ear level in the main listening position. Test tones were 1/6 octave sine waves copied from Snapbug's BFD site.
The following diagram shows location option 1. Each sub (one at a time) was positioned so its cabinet was 6" from the west wall and 6" from the south wall. The corresponding FR in the 4 graphs below is shown in PURPLE.
The diagram below shows location option 2. Each sub (one at a time) was positioned so its cabinet was 6" from the west wall and 5 feet from the south wall. The arrow shows the direction the port was facing. The corresponding FR in each of the 4 graphs below is shown in BLUE.
The following is the FR Chart for the PB12 in each location. The values are based on raw SPL readings. The FR of the PB12 in Location 1 is drawn in purple. The FR of the PB12 in Location 2 is drawn in blue.
This is the FR Chart for the STF-2 in each location. The values are based on raw SPL readings. The FR of the STF-2 in Location 1 is drawn in purple. The FR of the STF-2 in Location 2 is drawn in blue.
The following chart again shows the PB12's FR at each location. However, the values were adjusted for RS SPLM low frequency innacurracy. The SPL-compensated FR of the PB12 in Location 1 is drawn in purple. The SPL-compensated FR of the PB12 in Location 2 is drawn in blue.
Finally, the chart below shows the STF-2's FR at each location. However, the values were adjusted for RS SPLM low frequency inacurracy. The SPL-compensated FR of the STF-2 in Location 1 is drawn in purple. The SPL-compensated FR of the STF-2 in Location 2 is drawn in blue.
Note - FR data is available here:
https://home.comcast.net/~jcioffi6/pics/frdata.xls
QUESTIONS -
I'm in the process of shopping for a subwoofer for HT use. I was first turned onto, and purchased, a SVS PB12-isd. It's a huge upgrade over my old DefTech 10" sub and I am impressed with its performance. However, I just couldn't get over how freakin' big it is! Since I was also considering an HSU sub I decided to try an STF-2 as well to see if I could get a good sounding sub in a smaller package.
Both subwoofers have a high grin factor, but I slightly favor the sound of one over the other. I took SPL readings for each, at two separate locations, to determine whether one performs better based strictly on FR. I'm just not sure what the graphs are telling me.
These tests were performed with Phase at 0 and main speakers disabled. Crossover was set to 120 Hz within my processor. Master volume was increased until 16 Hz tone read 80 dB on my Radio Shack Analog SPL Meter. The meter was placed on a tripod at ear level in the main listening position. Test tones were 1/6 octave sine waves copied from Snapbug's BFD site.
The following diagram shows location option 1. Each sub (one at a time) was positioned so its cabinet was 6" from the west wall and 6" from the south wall. The corresponding FR in the 4 graphs below is shown in PURPLE.
The diagram below shows location option 2. Each sub (one at a time) was positioned so its cabinet was 6" from the west wall and 5 feet from the south wall. The arrow shows the direction the port was facing. The corresponding FR in each of the 4 graphs below is shown in BLUE.
The following is the FR Chart for the PB12 in each location. The values are based on raw SPL readings. The FR of the PB12 in Location 1 is drawn in purple. The FR of the PB12 in Location 2 is drawn in blue.
This is the FR Chart for the STF-2 in each location. The values are based on raw SPL readings. The FR of the STF-2 in Location 1 is drawn in purple. The FR of the STF-2 in Location 2 is drawn in blue.
The following chart again shows the PB12's FR at each location. However, the values were adjusted for RS SPLM low frequency innacurracy. The SPL-compensated FR of the PB12 in Location 1 is drawn in purple. The SPL-compensated FR of the PB12 in Location 2 is drawn in blue.
Finally, the chart below shows the STF-2's FR at each location. However, the values were adjusted for RS SPLM low frequency inacurracy. The SPL-compensated FR of the STF-2 in Location 1 is drawn in purple. The SPL-compensated FR of the STF-2 in Location 2 is drawn in blue.
Note - FR data is available here:
https://home.comcast.net/~jcioffi6/pics/frdata.xls
QUESTIONS -
- Based strictly on FR at both locations, is either sub a better performer?
- Based on FR, does either LOCATION pose an advantage?
- Are there any other locations/orientations that I should be trying? Please note that I share the East wall with my neighbors and would prefer not to crumble it. [/list=1]
Thanks all!