Is this as good as it gets in 4 " Full range ? - diyAudio
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Old 4th July 2014, 07:36 AM   #1
sdep777 is offline sdep777  United States
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Default Is this as good as it gets in 4 " Full range ?

Is this as good as it gets in 4" Full range ?
I am looking for the best for closed box

Has an EBP of 94 only 4 points from being suited for both closed box or bass reflex although the Xmax seems high for a sealed box at 4.3mm one way.
an Fs of 65.40 and Qes of 0.69 and Vas of 5.17 ltrs

The curve on this looks honest and incredible and it is only 36.00

If you or someone you know has used this driver in a closed box setup sure would like to hear a quick review

Is it just me or does that cone color look Ugly ?
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Last edited by sdep777; 4th July 2014 at 01:07 PM.
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Old 4th July 2014, 08:16 AM   #2
xrk971 is online now xrk971  United States
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Your images are kind of small to see but I can barely make out that you are referring to the MA CHR-70, certainly a very well liked driver around here and appears to be a great value. It has a more expensive brother called the Alpair 7 that many people like too. If you are going to use it sealed, you won't get to experience the low bass extension it is capable of, but that is fine for use with a helper woofer. When you say is this as good as it gets, just make sure you are aware that some folks object to the peak at 12 kHz which can vary by 20 dB over the different angles of off axis listening. The data is presented from -10dB to +110dB a rather large scale that visually flattens a response. Most people agree that this is a great sounding driver and is very versatile for use in BR or TL alignments. If you are looking for a flat response from a driver for a sealed box with circa 85 dB efficiency, take a look at the Vifa TC9FD. It costs a lot less but the smoothness and low harmonic distortion are among the best of a driver at any price in the 3 to 4 inch range. Here is the response of the TC9FD in a sealed spiral TL cabinet:
Click the image to open in full size.
Another driver worth looking at with great smooth response and ideal for sealed boxes is the Faital Pro 4FE35. Both the TC9FD and FE35 also work well in an open baffle.
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Old 4th July 2014, 08:22 AM   #3
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In the CHR'sprice range there are a wealth of choices, but not many suitablefor very good LF extention sealed. The Alpair7.3 i consider much better.

dave
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Old 4th July 2014, 08:28 AM   #4
sdep777 is offline sdep777  United States
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You know the Faital Pro , I actually liked it but just could not see how to make it attractive with that awful looking mounting basket, but the product does look worthy I will say that. and although they seem to be very well regarded the TB drivers all seem to have incredibly smooth response curves almost all of them and I still may go with a couple TB . I just have to believe that most drive units are going to experience turbulence, both minor and slightly major along their curve that is just the way it is.

thanks for taking the time to reply
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Old 4th July 2014, 08:38 AM   #5
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Depends what you mean by 'good as it gets' since that varies with opinion, requirements and personal taste. All drive units are different. The Mark Audio units are however, very good examples of what they are.

The CHR linked to is their entry-level metal-cone model in the 4in size bracket (Alpair 7 is the range-topper) -you can get it in an off-gold colour if you don't like the grey.

The graphs are honest for what they are; there's no software smoothing applied, but the vertical / dynamic scale is larger than you'd usually get with a midbass or tweeter (providing a similar effect) -this is normal practice for wideband driver unit manufacturers.

Re EBP, don't pay much attention to it. It's at best a very simplistic 1st pass approximation. The CHR does fine in both sealed and vented boxes however.
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Old 4th July 2014, 08:43 AM   #6
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TB do make some very nice drive units, but their published data is generally 'optimistic.'

As for deviations from a flat response: right. All widebanders do. No exceptions. Theoretically, the smaller ones should (should) have the least, assuming a flat response was targeted in the first place & the design & manufacturing are competent. As you go larger, it becomes progressively more difficult to do it. Wideband drive units rely on controlled resonance to produce the high frequencies. That's not easy (classic understatement there), especially with a large cone. And you get variations even in the same size bracket.

Take, for e.g., the Vifa TC9 referred to above by X. This is about the flattest in terms of FR that you can get from a widebander (and very impressive it is too). The Mark Audio Alpair 6P is in the same size bracket, and is also good, albeit not quite as linear in response terms. They have exactly the same Sd (36.3cm^2). Vifa doing a better job? Depends. Because they're not the same. Compare Mms and Xmax for a moment:

TC9 is a featherweight 2.6g and has 2.55mm Xmax.
A6P is even lighter at 2.32g, but has a much longer coil & suspension travel: Xmax is 10mm. It's also a little more efficient, translating into an extra 1.5dB sensitivity or so in practice, along with the greater LF extension &c.

So something has to give. The TC9 is a more highly damped design, & less micro-resonant sensitive than the 6P. This provides that very linear FR & impressive distortion performance, but 'detail' (I don't like the term, but you get the idea) is somewhat less. Horses for courses and no reflection on either unit -they are what they are and the options are there for people to select what suits their needs best. Amongst many others -I used these as a quick example because I had the data to hand & they share the same Sd.
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Last edited by Scottmoose; 4th July 2014 at 08:59 AM.
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Old 4th July 2014, 08:55 AM   #7
sdep777 is offline sdep777  United States
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This is another drive unit on my list even carries a 5 yr warranty and if I am not mistaken TB makes these for Dayton

Nominal Diameter 4"
Power Handling (RMS)30 Watts
Power Handling (max)60
WattsImpedance8 ohms
Frequency Response 87 to 20,000
HzSensitivity 85.6 dB 1W/1m
Voice Coil Diameter1"

THIELE-SMALL PARAMETERS
Resonant Frequency (Fs) 87.5
HzDC Resistance (Re) 6.05 ohms
Voice Coil Inductance (Le) 0.48
mHMechanical Q (Qms) 2.52
Electromagnetic Q (Qes) 0.71
Total Q (Qts) 0.55
Compliance Equivalent Volume (Vas) 0.09 ft.

The quality of drive units that are currently available today were unimaginable back in 1988 when I was into all this, just have to wonder what 20 more years will bring to Transducer technology
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Last edited by sdep777; 4th July 2014 at 09:01 AM.
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Old 4th July 2014, 08:57 AM   #8
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LOL everyone's data is Optimistic....including MA.
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Old 4th July 2014, 09:00 AM   #9
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Of course. None of them would sell any drive units if they didn't. As I said in Post 5:

Quote:
This is normal practice for wideband drive unit manufacturers.
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Old 4th July 2014, 09:09 AM   #10
sdep777 is offline sdep777  United States
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I guess what I am really asking is if I get a couple drive units from any mfg and put them on the woofer tester am I going to be in shock, feel like I got took or glad I went with that particular Mfg. and those curves provided by Mfg are pre broken in or post broken in drive units ?
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