Infinity Primus Owner's Thread - Page 117

Interesting...

Another good reason to buy from monoprice.

Palmfish, I'm confused. First you say the receiver brand or wattage doesn't matter. Now you say cables do. I'd get the best receiver I could based on reviews and legitimate specs then go to my local hardware for 14g zipcord to be used as high quality speaker cable.

I never said the cable matters. Lamp cord is fine. The only consideration would be the length of the run from the receiver to the surround speakers. My right rear channel is 75' linear feet from my AVR, so i played it safe and chose 12 ga wire.

The 12 ga. monoprice wire i linked is lamp cord. This is what I use...

http://www.monoprice.com/products/product.asp?c_id=102&cp_id=10239&cs_id=1023901&p_id=2817&seq=1&format=2

It costs a whopping $0.32 per foot!
Edited by palmfish - 1/28/13 at 8:58pm

Is part of this cable marked by color or something that will help remind you where connection goes so you don't mix up the polarity? Like the red and blue on the back of a receiver.

And another question, what spec on a speaker tells you how much power is needed from the receiver?

Just bought a set of P363's with the deal from Fry's, waiting on the delivery man!

Quick question, are there standard DIY mod's people do to these speakers to overcome the "cheap"-ish cabinets? I couldn't find much on AVS but google shows a few suggestions for the older versions of these speakers.

I'll run them on their own for awhile, but I imagine the DIY itch will start in before too long. I am thinking of opening the speakers up and doing the following:

• Add in a bit of extra wood bracing
• Do a light layer of fiberglass over the bracing, and then a layer of bondo milkshake (resin + filler) over all vertical faces inside to strengthen & stiffen
• Coat of primer over the resin
• Layer of peal & seal (basically dynamat) over all interior faces
• Either acoustic foam or some owen corning insulation, 2" thick, over the peal & seal
• 3-4# of polyfill in each cabinet

I know the above sounds like a PITA, but I've got the material on hand and have built a couple sets of speakers so I'm at a decent comfort level with it. I'd also solder the wire connections where I could and then reinforce the speaker mounts as much as necessary.

Anything else that might be "low hanging fruit" that I could improve on when I have the speakers open? Not looking to move the port, replace the speakers or anything else like that.
Edited by AudioBrewery - 2/1/13 at 7:16pm

I made a few lightweight mods. See http://www.diyaudio.com/forums/multi-way/215759-zobsky-tweaks-infinity-primus-363-floorstander.html . If you wanted to do more, consider some extra side to side bracing towards the bottom of the cab and / or doubling up on the cab thickness towards the bottom ( it really is resonant )

Right now, contemplating changing the tweeter but haven't decided on anything concrete

Just got my 363's set up. They make the 163's they replaced sound so bad. The 163's went to surround duty. I have the 351 for the center. Just need to replace my old Polk htib sub.

Sent from my Nexus 7 using Tapatalk 2

I have three P163's for my 3 front speakers, and I'm thinking of upgrading my surrounds also. The P143's and 153's are obvious choices, BUT the P153's are too big(deep) for our family room. The P143's size is fine, but they only go down to 100 hz. Should I be concerned about them only going down to 100 hz? If I buy the P143's, does that mean I have to set my receiver's crossover to 100? If so, that seems like I'm wasting the capabilities of the P163's in front. What do you guys suggest? My receiver is the JVC RX-7030. Thanks.

No. My surrounds are set by Audyssey XT32 at 100hz and 120hz.

No, but no reason not to.

Assuming that you have at least one sub, it looks like you can only set one crossover. So 100hz is fine.

If all that'll fit are 143s, then that's what you'll need to get. I have 163s for side/rear surround, and cross them at 80 hz. If you can only fit smaller speakers back there, then that makes the decision for you.

My receiver does not have any type of auto speaker calibration. My sub is a 8" Sony for this TV setup.

So it seems like I have 2 options if I go with the P143's.

1) Set receiver's crossover to 100 hz, which matches surrounds low end. But then the fronts cannot output between 50 hz. and 100hz. Isn't that bad?

2) Set receiver's crossover to 80 hz. Then the surrounds cannot output between 80 hz and 100 hz. This seems like the better choice, doesn't it? Is there much coming out of the surrounds between 80 and 100 hz?


Do you guys think 1 or 2 is my best option? Thanks.

No, that's why you have a sub. The sub, if it is any good at all, should be able to outperform the woofer in a book shelf speaker.

Not necessarily. You should experiment and try both alternatives and decide by ear which you feel is best. Trust your ears.

Thanks fookoo. I know about trusting my ears, but "technically" which one is the better choice?

There is no absolute reference when it comes to audio. It comes down to preference; i.e., whatever sounds best to your ears.

Thanks. I thought I'd have more replies.

Technically, you don't want a hole between where your speakers naturally roll off (100Hz) and where you set the subwoofer cut off (80Hz). Practically, there might not be a hole for a variety of reasons (speakers end up extending lower being near a boundry, enough energy from speaker/sub overlap so no hole or dip occurs, etc). And, if there is a dip, you might not hear it (not uncommon).

If you want to be careful, then set the crossover to 100Hz. Personally, I would try both and listen for which sounds better.

BTW, does your receiver allow your front speakers to be set to different crossover point than the surround speakers?

Hi,

Have been looking to switch from a polk set-up to an Infinity Primus set-up. Have been looking for the past week for deals online for the pc351 but best price I can find is $199. Does anyone have an active link to a better price? Was looking more into the $120-$150 range.

Frys has a great deal currently on the p363s and the p163s but nothing on there for the pc351.

Appreciate any assistance on this.

Thanks,

No. I can only choose 1 crossover setting, which covers all 5 speakers.

I was thinking that choosing a 80hz crossover setting would be best because the 3 fronts handle the majority of the sound.

Hi Jim McC, just a note ... surround speakers doesn't have to match with your front L,C,R speakers.

You sure that your front speakers do a better job of reproducing the frequency range between 80Hz and 100Hz than your subwoofer does?

I marvel that people talk about crossover frequency choices only in terms of power handling or dynamic range.

To me the big issue is bass imaging. I favor setting the crossover frequency as high as you can and not start hearing upper bass sounds coming from the wrong place.

No. I've only had the fronts for 2 weeks, but they are very popular, quality speakers(Infinity Primus P163). And the sub is a cheap 8" Sony, which most people here think sucks(Sony subs).

I'm no audio guru, that's why I'm asking.

What are the best brackets to use to wall mount a set of 163's?

just picked up a pair of 363s... and a pair of 163s at Frys. the 163s will probably serve as surround speakers, with the 363s seeing duty as back surround in a 7.2 system. Decided to see how they'd match with my SM155 fronts & SM Video Center. So far, am quite happy with the purchase. When I listened to them in the store (not the greatest environment), I thought they sounded ok. Sounded much better when I got them home & listened to some decent source material. I thought the bass extension was quite good. The mids are great. The tweets seem to have a bit of sizzle, but hope that smooths out with time. Was surprised to note how forward the soundstage was... for both the 363s and the 163s. For $117 and $59 each, respectively, these are pretty impressive speakers.

I have two sets of these. They aren't cheap, but are very well made and handle the weight well.

http://www.amazon.com/Pinpoint-AM-40B-Clamping-Bookshelf-Speaker/dp/B002UV03MW/ref=sr_1_4?ie=UTF8&qid=1360265759&sr=8-4&keywords=pin+point+bracket

Would have to agree for mounting any book shelf speakers on a wall.

Does anyone here have the Primus PS38 subwoofer? If so how is it? It's between that or the Dayton SUB-1200 which is like 70 dollars cheaper.