Originally Posted by Scott Simonian
Is this how it was tested the day of the GTG?
Did you power your LMS-Ultra's with said SP2-8000 against the SP2-8000 powered HS24?
There were 4 phases to Beast's GTG on Saturday.
1. Single HS24 against 2 LMS 5400s
2. JTR Noesis 212HT-LPs(mine) against Beast's Danley SH50 speakers
3. Try to blow up the SI HS24 with 8,000w
4. Hook back up Beast's system for some serious enjoyment (Beast's 8 SI18s and Danley's were impressive and awesome. Best theater I've ever heard.)
Regarding test 1, a single Stereo Integrity HS24 was pitted against my pair of LMS 5400s. The SI HS24 was powered by Beast's IPR7500 and since I know there was only a single connection at the back of the sub initially, that means it was running at 4ohms on 1 channel of the IPR7500, which gives about 2000w. My LMS5400s were wired at 4ohms in each enclosure so they were each connected to a channel on SpeakerPower SP2-8000 and received 2,400w each. BossoBass and his son had measuring equipment so we were able to hear and see (Spectrograph) that the HS24 had more bass, especially below 15Hz. Regarding sound quality, they really sounded the same. You couldn't tell which was which when we did the A/B portion of the test.
Regarding test #3, the HS24 was rewired to allow each voice coil (2ohm) to be hooked up to an amp channel. Initially the HS24 was hooked up to Beast's IPR-7500 but after a few minutes, it went into protection mode. We disconnected the amp and measured the coils to find they were closer to 1.6 ohms instead of 2 ohms. So then we hooked up my SP2-8000 so that 4,000w was going to each voice coil for a total of about 8,000w. My amp worked well for about 15 min until we went to +10 over reference and after a few minutes my SP2-8000 also went into protection. It wasn't thermal, Brian at SpeakerPower and Mark Seaton thought it went into some sort of DC protection. We reset the amp and it continued with the HS24 but we were at or below reference and soon got bored since it was apparent we weren't going to be able to blow up the HS24.
One more thing. I've since ordered a second SpeakerPower SP2-8000 since Mark Seaton and Brian at SpeakerPower think I should wire my LMS-5400 subs down to 1 ohm and connect each sub to a channel of the SP2-8000 such that each sub will get 4000w each. I know that's a 1 ohm load on a 2 ohm channel but since Mark Seaton and Brian at SpeakerPower seem to think it would be fine, I'm going for it. So that means I will have 16,000w of power to 3 LMS-5400s (4000w each) and 2 UXL-18s (2000w each). It would be interesting to see how my LMS-5400s with 4,000w each would compare to a single HS24 with 8000w. I have a feeling it might be a closer fight than it was in the first test.