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Old    Christian Fis (fischris)      Join Date: Mar 2010       05-28-2010, 8:43 AM Reply   
Hello all
What is the best sounding solution with my amp (Hifonics zxi9000) :
I want to stay in 4 ohms!
2 bullets hollowpoints 77 wiring 2x300W rms OR
4 bullets hollowpoints 77 wiring (each pair in series and then each group in parallel) 1x900W rms
Thanks for help
Old    A.J. West (you_da_man)      Join Date: Sep 2009       05-28-2010, 9:11 AM Reply   
I have 2 pair of 770's but I'm using 2 JL Audio G1300 amps. I'd say 2 pair if the amp can adequately power them. Plus 4 speakers looks so much better than 2 on the tower
Old    Christian Fis (fischris)      Join Date: Mar 2010       05-28-2010, 9:33 AM Reply   
I agree with you for the look but for the sound with my amp specs in bridge mode ? http://www.audiodesign.de/downloads/...ZXi_Manual.pdf
Old    Hate N Pain (hatepain)      Join Date: Aug 2006       05-28-2010, 9:49 AM Reply   
I run 4-770's with 900 watts (Boston Acoustic GT-28) pushing them and love it. I run mine at 2 Ohm's and it sounds great. In the open field environment you won't notice a difference in sound quality between 4 and 2 Oohm. The only real benefit would be your amp running more effeciently and cooler. Just an FYI I considered getting a HiFonics for my Bullets but was advised against it by a respected installer here on the boards. His thoughts were, and I agree, you're spending so much on the speakers don't skimp on a lesser amp. If you already have the amp run with it and see if you're happy with it. I started mine out on a JBL Px 300.4 (125x4) they sounded really good and were very loud but when I upgraded to the current amp it was a huge difference in sound quality.
Old    Christian Fis (fischris)      Join Date: Mar 2010       05-28-2010, 10:58 AM Reply   
By reading the all comments I certainly change my amp next year but for now what's your opinion? I want to spent time in wiring and fixing cleanly the 2 other speakers!
Old    Hate N Pain (hatepain)      Join Date: Aug 2006       05-28-2010, 11:12 AM Reply   
I would run 2 pair (4 speakers) in parallel thus the amp at 2 ohm's. This would give you 250 watts to each speaker. Be sure and set the filter on high pass and cross it over around 80-120.
Old    Duffy Mahoney (duffymahoney)      Join Date: Sep 2008       05-28-2010, 11:16 AM Reply   
Why can't you set the amp on full? I have mine on full and it's sounds great for wakesurfing.
Old    Shawndoggy (shawndoggy)      Join Date: Nov 2009       05-28-2010, 11:45 AM Reply   
Quote:
Originally Posted by duffymahoney View Post
Why can't you set the amp on full? I have mine on full and it's sounds great for wakesurfing.
80hz on down is the domain of a subwoofer. Why make your bullets try to make that sound?
Old    Hate N Pain (hatepain)      Join Date: Aug 2006       05-28-2010, 11:49 AM Reply   
Hi pass is best for the HLCD portion of your co axial it maximizes performance and sound qaulity so that its a little less harsh. Full also tends to be a little to bassy. In a wakesurf setting at lower volumes it probably does sound pretty good though.
Old    Duffy Mahoney (duffymahoney)      Join Date: Sep 2008       05-28-2010, 9:02 PM Reply   
Hate, I might try switching it, but it sounds freaking amazing at medium-high volume and at surf length.
Old    Mike B (mlb75)      Join Date: Aug 2007       06-01-2010, 8:15 AM Reply   
Run two sets, with a pair to each channel, like was mentioned above set it to HP and the speakers will be happier. One nice thing about those amps is they're not picky, I've had JL and Boston as well and the others may be a little more efficient but the difference in sound quality was marginal and the hifonics have never cut out on me. My GT28 sounded great but only lasted a little over one season before the moisture killed it...
Old    Christian Fis (fischris)      Join Date: Mar 2010       06-01-2010, 10:20 AM Reply   
Ok for 2 sets. But what do you prefer mono at 4ohms or stereo at 2ohms ? (sounding and amp durability)
Old    Earmark Marine (david_e_m)      Join Date: Jul 2008       06-01-2010, 11:21 AM Reply   
Here's why you should not run any tower speaker fullrange.

When you place the midbass driver in a small pod (.1 to 1.5 cu. ft. on average) the resonance becomes much higher and the speaker will actually begin to roll-off somewhere between 100 to 200 Hz. Its impossible to compress and rarify the rigid air mass in a tiny pod past a certain point. And, it takes an inordinate amount of power, not to mention placing the speaker under extreme mechanical and electrical stress, to try and drive a speaker below that bandwidth in which the speaker operates efficienctly. Also, as the resonance increases in a small pod the impedance coincidently rises resulting in less available amplifier power. In the same way the heavy mass, high compliance and high voice coil inductance of a woofer restricts it from reproducing high frequencies. Its wasteful and inefficient to dedicate power to a speaker in a bandwidth it can't contribute.

I can easily spot a system that is improperly tuned and therefore inefficient. The waste and compression is obvious.

So never crossover a tower speaker below the bandwidth that it comfortably reproduces. The unecessary power and excursion don't translate to audible benefits.

Crossed-over correctly, the speaker will be more dynamic, cleaner and project farther.

Larger tower speakers (Pro485 for example can highpass as low as 80 Hz. Smaller tower speakers may crossover as high as 125 Hz.

Don't always trust the nomenclature on the amplifier chassis. Some mistrack by as much as an octave. Each system should be set individually by ear and a few visual cues (excursion).

David
Earmark Marine
Old    Mike B (mlb75)      Join Date: Aug 2007       06-01-2010, 1:46 PM Reply   
I run it stereo 2 ohm per channel but that's just what works for me

BTW appreciate the detailed replies david I wish I was closer to you guys
Old    Duffy Mahoney (duffymahoney)      Join Date: Sep 2008       06-01-2010, 1:50 PM Reply   
All right I will switch my amp to high pass and put the crossover between 80-125.

Duffy

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