- View New Content
- Blu-ray, DVD, Streaming Video and Digital Downloads
- Home Theater Hardware
- Theaters, Remotes and Accessories
- Equipment Reviews
- DVD & Blu-ray Reviews
- Other Diversions
- Bargains and Deals
- Feedback and Testing
- Latest Blu-ray Deals
- Shop Amazon & Support HTF
- Theater Photos
DVD & Blu-ray Reviews
- Equipment Reviews
Blu-ray Release Listings
- Shop Amazon
- Support HTF
More power needed for Tempests?
133 replies to this topic
Posted August 17 2003 - 09:31 PM
As some of you know I have received an RMX1450 to power my two Tempest sealed subs (230L). I guess what I want to know is how much power is required for them to reach their potential? because 450 watts doesnt seem to cut it. I've tested them with some real bass heavy material (LOTR,JP3 etc.) and seem to be able to clip the amp quite easily with that material and the subs arn't even breaking a sweat! My first thought was that I had one of the low frequency filters on but i've doubled checked many times and all filters are off. I've been thinking about getting a second RMX1450 and bridging one amp into each sub. I know it sounds crazy but I think the subs could probably handle it, not continuesly of course but for short transients I think they could, and theirs nothing wrong with having a little extra headroom! I don't even want to venture a guess at how much power would be required to drive a Tumult full out!
Posted August 18 2003 - 09:47 AM
It should take ~170W to reach max excursion at 20Hz, according to WinISD.
Posted August 18 2003 - 10:37 AM
Since the Tempest is rated at 750W max with both VCs wired I can see the amp giving out before the drivers. It takes a lot of power down low in a sealed enclosure to hit the levels you seem to be looking for. Another amp will get you closer. I've used a 1000W amp on my sealed Tempest and could only get the gain up about 3/4 on LOTR. (That was loud enough thank you).
Posted August 18 2003 - 03:19 PM
|It should take ~170W to reach max excursion at 20Hz, according to WinISD.|
That is true, but a program source usually contains alot more than one frequency at a time so you would need alot more than 170 watts to push them to their max unless you enjoy listening to test tones
Posted August 18 2003 - 10:54 PM
|That is true, but a program source usually contains alot more than one frequency at a time so you would need alot more than 170 watts to push them to their max unless you enjoy listening to test tones|
Not sure what you mean by this.
Posted August 19 2003 - 03:11 AM
|Not sure what you mean by this.|
Right now I do have 450 watts to push each one of my Tempests but if I wanted to pull 450 watts at 20 hz without clipping the amp the only way to do it would be with a pure sinewave. If I wanted to produce 2 sinewaves at the same time with the amp at the same gain it would require 900 watts to do this and 1350 for three sine waves etc, etc...
Program material contains multiple sine waves all at the same time and each one takes a little amplifier power away with it. If it takes 170 watts for a Tempest to reach XMAX at 20 hz thats almost half my power gone already.
Posted August 19 2003 - 03:59 AM
450W is more than enough power. You're getting caught up in analysis paralysis.
RAD Home Theater
RAD Home Theater
Posted August 19 2003 - 04:40 AM
Brian, "analysis paralysis" came up in Six Sigma statistical analysis training last week. It's a common pitfall. Good catch
Posted August 19 2003 - 09:25 AM
|Perhaps you're sitting at a null spot during the movies.|
I have measured the frequency response of the subs and trust me there is no null spot in any of the listening positions.
Heres what I got at the listening position.
10 hz 80.4 db
15 hz 84.5 db
20 hz 89.3 db
25 hz 89.6
30 hz 90.4 db
40 hz 90.7 db
50 hz 89.5 db
60 hz 89 db
70 hz 88.9 db
80 hz 88 db
90 hz 89.1 db
100 hz 89.1 db
That looks pretty good to me and when I sit in any other spot during the movie the bass sounds just as good infact it sounds exactly the same.
|450W is more than enough power.|
If it was than my amp wouldn't clip at my normal listening level. I don't know if I'm listening at reference level or not, all I know is that it is loud and thats the way I like it!