Deftech Timbre matching - Error on the side of... - AVS Forum
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Old 01-16-2013, 10:18 AM - Thread Starter
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So I recently picked up a new HT setup used for a great price that consisted of:

Deftech 8040 fronts (3.5" drivers)
Deftech 8080 center (5.25" drivers
Deftech 8080 surrounds (4.5" drivers)

The center channel is easily the most powerful unit in the setup and I can tell that it sometimes overshadows the fronts during movies/tv with migrating voices and general midrange shifts of sound. Ideally, I would like to upgrade my fronts to the 8080 towers to be a direct timbre match, but seeing as they are the current model it is hard to get a good deal on them anywhere, and I can't justify buying them new (young and somewhat broke). I do, however, have an opportunity to get a good deal on the BP7001sc's. These will also not be a direct timbre match to the center channel (6.5" drivers), but will they sound blend better than with the smaller drivers?

I guess my main question is just about timbre matching in general. If you cannot produce an exact timbre match (but have all speakers from one company), is it better to have the center channel with larger or smaller components than the front towers?

2nd question: Is it worth essentially trading my 8040 towers +$500 for some bp7001's?

As always, thanks for any responses and help.

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Old 01-16-2013, 02:11 PM
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I can't speak to specific commercial speakers as I tend to build my own, but your question is one we've all considers when assembling a system.

The CC should be the equal or better of it's L/R companions, and yours is. Odd that you say you they overshadow the fronts, with migrating voices and shifts of sound (location, I assume?), yet you ask about timbre... this sounds far more like a surround system set-up (level/distance) issue.

What's your AVR? Does it have an automatic room correction system? Have you run it? If you don't have automated measurement of speaker levels and flight times, there should be a facility for entering it yourself. Use a tape measure for the distances from your seat to each speaker, and your ears for the relative level. The level match in my old AVR used pink noise, very clearly showing timbral differences; yours may, too.

Always rememeber that if you test and your ears are happy, it doesn't matter who made the speakers. I'd do some more work with what I've got before spending any more... unless its the AVR that's the next weak link!

HAve fun,
Frank
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Old 01-17-2013, 10:42 AM - Thread Starter
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Hey fbov, thanks for the response. To answer some of your questions: I'm running this system on a Denon AVR1613 (75wpc) and have used Audessey to set up the speakers and have tried to position them all at their respective equidistant points to the listener. Though, I may have overlooked one 'small' factor when writing the original post. I forgot that when I set up my system it was without the TV on the stand, so the Center was in line with the FR/FL speakers. When I got my TV back on the stand, I had to put the center on a small end table in front of the entertainment stand, so it is now ~2 ft in front of the other front speakers (and 2 ft in front of where it was calibrated). I had completely forgotten about that when I wrote the post... I've been lazy about building the box for the TV to sit on so I can get the center back in the right place.

Anyways, thanks again for the info. I still think the issue has a little to do with the center having 5 1/4 drivers and the fronts having 3 1/2... something just doesn't sound quite right even when I have them set up correctly. I'll have to mess around with placement a little more I guess.

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Old 01-17-2013, 03:02 PM
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Moving the CC after setting Audyssey did 2 things:
- changed the phase relationship with the other speakers (think transit/arrival time)
- changed the SPL at the listening position.

Audyssey sets speaker level and phase relationships based on measured sensitivitiy and arrival times. It uses a full range FR scan, with a "chirp" at the end for timing. Your AVR should have a menu option that allows you to view speaker level and distance settings and adjust manually, but there's a third thing at work.

Speaker frequency response varies with proximity to boundaries. You don't realilze it, but the TV is a wall over most of the CC's range. My CC is also below the TV, and I use a different XO design than I would if it were free-standing, away from boundaries, in order to flatten its uncorrected frequency response.

Try running Audyssey in the exact listening environment you use and see if that helps.

That said, it could be that this CC isn't a good match with the rest of your system, or your room. My first DIY speaker was a CC, a vertical speaker laid sideways, and after learing speaker design, I discovered the tweeter polarity was wrong, and it needed a little padding. Even with those corrections, it doesn't do dialog as well as my current CC, which was designed as a CC even as it cost 2x it's predecessor (same mid-woofs).

HAve fun,
Frank
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Old 01-18-2013, 05:22 AM
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If you can trade your BP-8040's plus $500 bucks for a pair of BP-7001's then I would do that in a heart beat as that would be the deal of the freaking century! Seriously, run, don't walk, to finish this deal! That has seriously got to be the very best deal on finding "hidden gems" that I have ever seen or heard of! The BP-7001's are world class speakers and would be a very serious step up from the 8040's! You are freaking retarded if you let this deal pass you by!

The timbre between the BP-7001 and the CS-8080 will be very close as Def Tech voices all of their models to be compatible, but that should be your last concern, go get those BP-7001's before someone else realizes that is an absolute steal and snatches them up from you!
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