Amp for RF and sub may be ZX475 or Ti500.4 the good choice ?

[zorrobf2]

Hello,

what do you think about ZX475 or Ti500.4 used with channel 1-2 for RF (midwoofer and tweeter) and channel 3-4 bridged for Subwoofer ? is it a good configuration and good amps for this or not ?
my FF front is managed by MS275 and I need only one additional amp for RF and subwoofer, what's amp you suggest me ?

Thanks

[HoseHead]

I'd run the 4 mid/high channels off a ZX475 and bridge the MS275 for sub channel.

I understand the ZX doesn't like being bridged on only one side while running stereo on the other. C? Comments?

The MS needs a 4 ohm load bridged whereas the 475 will go down to 2 ohms minimum while bridged.

HH

[Bfowler]

i like that idea too^

[rolandk]

If you want to use only one amp than the ZX475/Ti500.4 should work fine. I've never heard of any probs running stereo fronts and bridged rear on that amp.

[1moreamp]

It always seems to cause a storm when I explain my point of view about the mis-use of a fine 4 channel amp.

My Opinion:
Bass amps are cheap nowadays, Do your system right, and yourself also, Buy a bass amp and don't skimp on your system. After all, you know you want to bang the gong on the bass, now don't you ?


PS a note to Rolandk: Yes I agree with you the amp can be configured and run in three channel mode and technically it should be a perfect setup. But we live in a imperfect world of heavy bassline and with that comes the resulting blown channels from bass overdrive and such. Hence my trepidation about running a fine 4 channel amp in three channel mode.....C


References:
please ask JED about the + 35 milli-volts DC offset on his Ti500.4 after running three channel mode for a short while. The two channels he used for bass were damaged by the constant overloading of the bassline, and hence his other two channels are like new with only 3 to 5 milli-volts DC offset on their outputs.
I also hereby testify about the huge number of amps I have seen over the last 20 odd years of all makes and brands that all exhibited huge DC offsets on the bridged channels from running three channel mode. It is a nice setup, clean, neat, and in a small package footprint. BUT it comes at a cost later own down the road. Especially if you like your bassline heavy and boomy.
" Buy a bass amp" its a more reliable setup, and it helps the business buy selling more amps, and by delivering you a more reliable and long lived setup.....C

[HoseHead]

C,
Does the above condition only a concern when returning the amp to run stereo?

What about bridging a 2-chnl amp like the MS275 or M100 or 2125? Again, if it only runs mono, does it matter?

Your time is appreciated.

Later, or as my 20 year old says, "I gotta peace out".

HH

[1moreamp]

C,
Does the above condition only a concern when returning the amp to run stereo?

What about bridging a 2-chnl amp like the MS275 or M100 or 2125? Again, if it only runs mono, does it matter?

Your time is appreciated.

Later, or as my 20 year old says, "I gotta peace out".

HH

Basically any amp can get beat up running bassline, but I feel a 4 channel amp gets more abuse when configured to run three channel mode only because of the demands presented to those two channels on Sub duty. < Less reliable setup>IMO

I am getting ready to pull my 2 MS-275's out of service < 15 years without a failure> Most of which was bridged on bass duty.
They will get new caps for the first time, and a check up to see how much damage clipping has done to them from running bass.
Of course I will revive them to like new, with bigger, and better parts from today that weren't possible when they were built. I do expect to see significant DC offset on the channels until I go through and resolve the damaged areas.
I would never expect to see this sort of trouble on my highs amp, as it never gets near clipping.

Again please allow me to address this openly: ANY amp will exhibit large DC offsets from being driven into clipping. Bass amps get this more often than all the rest. I attribute this to the way people hear, and the inability of most bass transducers to reproduce higher harmonics of distorted < Clipped > music.

The damage caused by running bass on any amp is permanent until repaired. Once you have done this to a highs amp like 475 or a 500.4 those two channels will have lower fidelity, and higher distortion, and a overall lose of SQ when compared to the other channels left untouched by clipped bass info.
So basically if you go back to using the 4 channel amp back on highs only the two channels bass went through will most likely be damaged, and will not match fidelity of the other two that only saw highs duty.

On MS and M series amp just check the DC offset like I outlined in the how to section. If you feel your DC offsets are high it can be fixed. I have done this for every amp I have seen from this forum, but I like things done my way when someone trusts me to work on their amp. And that means very low DC offsets always ...C