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#78370 - 04/23/09 11:07 PM 2 ohm load
butchgo Offline
Desperado

Registered: 06/22/07
Posts: 368
Loc: Southern Oregon coast
Has anybody had any experience running a 7500 with a two amp load?
I am thinking about experimenting with a pair of 4 ohm speakers, wired in parallel, for my center channel just for the heck of it but I don't want to take a chance of damaging my 7500.
_________________________
Epson 3500 3D projector
93" Carl's Place Flexiwhite DIY screen
Outlaw 976 Pre/Pro
Outlaw 7500 for LCR & L/R surrounds
1- Emotiva Mini X-A100 for rear surrounds
2- Outlaw LFM-1 EX subs
Oppo BDP-105 Blu-ray/DVD/SACD player
Outlaw LCR (Snell Labs) for center channel duty
Tekton Enzo XL L/R
4- Emotiva ERD-1s surround speakers
Monster HTS3600MKII power center

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#78371 - 04/23/09 11:17 PM Re: 2 ohm load
butchgo Offline
Desperado

Registered: 06/22/07
Posts: 368
Loc: Southern Oregon coast
Sorry.
Make that a 2 ohm load. shocked
_________________________
Epson 3500 3D projector
93" Carl's Place Flexiwhite DIY screen
Outlaw 976 Pre/Pro
Outlaw 7500 for LCR & L/R surrounds
1- Emotiva Mini X-A100 for rear surrounds
2- Outlaw LFM-1 EX subs
Oppo BDP-105 Blu-ray/DVD/SACD player
Outlaw LCR (Snell Labs) for center channel duty
Tekton Enzo XL L/R
4- Emotiva ERD-1s surround speakers
Monster HTS3600MKII power center

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#78372 - 04/24/09 02:15 AM Re: 2 ohm load
Keta Offline
Desperado

Registered: 12/29/02
Posts: 358
Loc: Central VA
Maybe wiring in series would be a better bet.

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#78373 - 04/24/09 08:41 PM Re: 2 ohm load
butchgo Offline
Desperado

Registered: 06/22/07
Posts: 368
Loc: Southern Oregon coast
I was going to try that this weekend.
I would really like to compare parallel and series and see if there is any difference in sound though.
I will call Outlaw and see what they say.
_________________________
Epson 3500 3D projector
93" Carl's Place Flexiwhite DIY screen
Outlaw 976 Pre/Pro
Outlaw 7500 for LCR & L/R surrounds
1- Emotiva Mini X-A100 for rear surrounds
2- Outlaw LFM-1 EX subs
Oppo BDP-105 Blu-ray/DVD/SACD player
Outlaw LCR (Snell Labs) for center channel duty
Tekton Enzo XL L/R
4- Emotiva ERD-1s surround speakers
Monster HTS3600MKII power center

Top
#78374 - 05/07/09 03:22 AM Re: 2 ohm load
TooManyHobbies Offline
Gunslinger

Registered: 12/23/08
Posts: 51
Loc: XXX
I'm curious what Outlaw had to say about using a 2-ohm load. Beyond stability issues, that's a big increase in output current, and unless you're really careful about how high the volume control gets cranked, you risk blowing the power amp, either output transistors or the power supply. I have used parallel-connected speakers in a center channel before for the 6 dB of additional output this provides, but my setup used 8-ohm speakers. Unless you are looking for the extra output of a parallel connection, a series connection of the 4-ohm speakers is much safer. Sound quality should not differ between a series and parallel connection, although you could experience some noticeable sound difference between a single and dual speakers due to comb filtering between the two speakers depending on their location to one another.

Bill

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#78375 - 05/07/09 10:32 PM Re: 2 ohm load
butchgo Offline
Desperado

Registered: 06/22/07
Posts: 368
Loc: Southern Oregon coast
Scott said that the 7500 can 2 ohm loads but when you parallel 2 4 ohm speakers the impedance can drop below the 2 ohm level but he also said that the 7500 could handle as much as a 1.8 ohm load.
The speakers that I was playing with had the potential to hit 1.6 ohms so I just wired them in series to see how they sounded.
_________________________
Epson 3500 3D projector
93" Carl's Place Flexiwhite DIY screen
Outlaw 976 Pre/Pro
Outlaw 7500 for LCR & L/R surrounds
1- Emotiva Mini X-A100 for rear surrounds
2- Outlaw LFM-1 EX subs
Oppo BDP-105 Blu-ray/DVD/SACD player
Outlaw LCR (Snell Labs) for center channel duty
Tekton Enzo XL L/R
4- Emotiva ERD-1s surround speakers
Monster HTS3600MKII power center

Top
#78376 - 05/08/09 12:36 AM Re: 2 ohm load
lanion Offline
Gunslinger

Registered: 07/12/05
Posts: 161
I run Polk LSI speakers in parallel with my much less beefy RR2150... in parallel they will drop down to 1.5ohms. I don't crank it and it hasn't been an issue with overheating.

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#78377 - 05/08/09 01:54 AM Re: 2 ohm load
candyman Offline
Gunslinger

Registered: 12/09/05
Posts: 76
Loc: Beaverton
The impedence ratings for my Logans are nominal 4ohm with minimal 1.2ohm. I've not had issues with overheating on my 7500.

Rob
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Yamaha CX-A5000 pre-pro
Outlaw 7500
Oppo BDP-83
Samsung 65" LED TV
Front: Martin Logan reQuests & Logos
Surround: Martin Logan Fresco i via Outlaw OAWA3
Sub: ACI Maestro w/ ICE amp

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