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-   -   Still not convinced to go with a fullrange driver but im tempted... (http://www.diyaudio.com/forums/markaudio/221981-still-not-convinced-go-fullrange-driver-but-im-tempted.html)

ORNJ 22nd October 2012 02:31 AM

Still not convinced to go with a fullrange driver but im tempted...
 
Ok,

I was looking at full range for home theater but it looks like that wont really work out. So I have been looking more at just building a pair for my office that will be used for music and be paired with my PDR-8 subwoofer.

However, I am still not 100% convinced that they can handle the kind of output I need for classic rock, along with classical, country rock, and some old pop thrown in(Frank Sinatra, Dean Martin, etc...)

I am sure part of this is just the fact that I cant get past the "old world" thinking about the bigger drivers being needed for lower frequenices with higher output.

At the same time though, I am very curious and it really isnt THAT expensive to try out at first if I build a pair of Pensils with the CHR-70.

So I am really tempted to go that route.

That said, the CHR-70 is lower in sensitivity and I am worried if it will play loud enough when I get either a tube amp or f5 built.(I am currently using a quickie preamp from my computer)

Anyone else have doubt about full range but wound up being VERY happy with the full range drivers? I know there are most likely some of you out there especially with Mark Audio drivers since they look like the best bang for the buck when I look at the frequency respons.

TheSeekerr 22nd October 2012 02:57 AM

I have (or rather, my girlfriend has) a pair of CHR-70's in bookshelf cabinets (Dave's CHR-Ken), being driven off a teeny little Tripath that's maybe good for 5W a side before distortion, 15W flat out.

They're fine, really - the sensitivity is low, yes, but just how often do you listen at 90+dB anyway? When it comes to office/bedroom type applications, I suspect the answer is "not very often at all" - 90dB is really very loud.

I'd be wary of trying to power them using anything in the 1-5W range, but anything that can manage 10 clean watts per side ought to be satisfactory.

(and, of course, if you can cross them to a helper woofer/sub, their power handling at higher frequencies is more than adequate to go very loud indeed)

dekiller 22nd October 2012 06:10 PM

Maybe you should try the Alpair 12P, they are made for high-efficiency.

ORNJ 22nd October 2012 06:50 PM

Quote:

Originally Posted by dekiller (Post 3211172)
Maybe you should try the Alpair 12P, they are made for high-efficiency.

Yea, but they are so much more expensive when I want to just try something out when I dont know if I will like the sound from full range drivers or not.

However, it would be cool to use one as a tweeter/mid in a two way design for home theater. I have been told it is not the greatest idea to use them for HT use but if I only used it for the upper registers then it may work out really well. It would certainly provide a wide range of XO point to decide where I think it would be best to XO at to maybe try and smooth out the "shout" that many of these drivers supposedly suffer from.

planet10 22nd October 2012 07:21 PM

Quote:

Originally Posted by ORNJ (Post 3211224)
I have been told it is not the greatest idea to use them for HT use

Only by those that have not tried it.

dave

buzzforb 22nd October 2012 07:26 PM

I was absolutely shocked at the quality of the sound that came out of the MA drivers. I have not heard any of the Fostex or Lowther stuff, but i cannot say enough about his drivers. It is, without a doubt, a top quality entry into hifi. As for HT, I think they would be fine, but I would recommend a brick wall filter to make sure yo dont push them to hard. IN movies, you get frequencies that are rare in audio and can do damage. Add a sub and cross the Alpairs at about 100hZ or so, and you can shake the building and enjoy quality HiFi at the same time.

cotdt 22nd October 2012 07:28 PM

For home theatre, the Alpair 12P would work great. It's a 6.5" with a shallow cone profile and has the dispersion profile of most 5.25" drivers (yes I've measured). There is no shouting with the 12P like with Fostex drivers. You can either use a helper tweeter 1st order with no crossover on the 12P, or a full crossover at 2kHz. Both sounds great. But I do recommend a tweeter (others may get angry at me for recommending).

It can get very loud and the sound quality is very good. Even used as a typical midwoofer driver in a crossover, the sound is shockingly good. Keep in mind that if you use them away from the wall and have to add BSC, you'll end up with just average efficiency.

chrisb 22nd October 2012 08:21 PM

Quote:

Originally Posted by cotdt (Post 3211276)
For home theatre, the Alpair 12P would work great. It's a 6.5" with a shallow cone profile and has the dispersion profile of most 5.25" drivers (yes I've measured). There is no shouting with the 12P like with Fostex drivers. You can either use a helper tweeter 1st order with no crossover on the 12P, or a full crossover at 2kHz. Both sounds great. But I do recommend a tweeter (others may get angry at me for recommending).

It can get very loud and the sound quality is very good. Even used as a typical midwoofer driver in a crossover, the sound is shockingly good. Keep in mind that if you use them away from the wall and have to add BSC, you'll end up with just average efficiency.


FWIW, I've taken the other approach with using FR for a small room (420ft sq) HT 5.1 system - Alpair 7s for the front row (which for my aged / shopworn hearing don't need tweeters), XO'd via the surround receiver's bass management at 110 & 120Hz to a pair of dual driver woofer enclosures in corners. I don't approach within 15dB of the THX reference level (hardly ever surpass 90dB SPL at the prime listening position) and am very happy with the results.

Would this system meet everyone's metric of "great idea" for a HT system? probably not - for some folks anything less than 12-15" coaxes is a toy. For a single driver system would 12Ps all around deliver more realism? maybe. Would they cost almost twice the 7.3 price tag and need much larger enclosures to do so? most definitely - sooner or later compromises or budgetary constraints enter the calculus

Bob Brines 22nd October 2012 09:12 PM

As ChrisB does, I have A7.3's in my HT and crossed to a sub at 160Hz -- that fills in a phasing problem. They will go louder than I can stand. I am working on a small BR for the A10.2. These will eventually go into the HT and be capable of being MUCH louder than I can stand. Then I can get the A7.3's back in my 2-channel where they belong. If you have never heard the A7.3, the A10.2 would do everything you might want. At reasonable SPL, the A7.3 does it better.

Bob

mandoman 22nd October 2012 10:16 PM

Quote:

I have been told it is not the greatest idea to use them for HT
Quote:

Only by those that have not tried it.
Agreed! I made a HT system a couple of years ago with the original A6. The front speakers are MLTL and the rear are small BR. It goes louder than I ever need, although it is in a fairly small room. We sill use it and I am still very happy with the sound.


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